201771010126 王燕《面向物件設計 java》第十五週實驗總結
第一部分 理論部分
◼ JAR檔案◼ 應用程式首選項儲存◼ Java Web Start
JAR檔案:
1.Java程式的打包:程式編譯完成後,程式設計師將.class檔案壓縮打包為.jar檔案後,GUI介面程式就可以直接雙擊圖示執行。
2.jar檔案(Java歸檔)既可以包含類檔案,也可包含諸如影象和聲音這些其它型別的檔案。
3.JAR檔案是壓縮的,它使用ZIP壓縮格式。
jar命令 1 jar命令格式: jar {ctxui} [vfm0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ... 2 Jar命令選項(教材581頁表13-1): – -c 建立一個新的或者空的存檔檔案並加入檔案。 – -C 暫時改變到指定的目錄 – -e 在清單檔案中建立一個條目 – -f 將JAR檔名指定為第二個命令列引數 – -i 為指定的JAR檔案產生索引資訊 – -m 將一個清單檔案(manifest)新增到JAR檔案中 – -M 不產生所有項的清單檔案(manifest) – -t 列出存檔內容的列表 – -u 更新已存在的JAR檔案 – -v 生成詳細的輸出結果 – -x 解壓存檔中的命名的(或所有的〕檔案 – -0 只儲存方式,不用ZIP壓縮格式
(1) 建立JAR檔案 jar cf jar-file input-file(s) c---want to Create a JAR file. eg: 1) jar cf MenuTest.jar *.class *.gif f---want the output to go to a file rather than to stdout. 2) jar cvf MenuTest.jar *.class *.gif v---Produces verbose output to stdout. 3) jar cvf MenuTest.jar * *---create all contents in current directory. 4) jar cv0f MenuTest.jar * 0---don't want the JAR file to be compressed.
(2) 檢視JAR檔案 jar tf jar-file t---want to view the Table of contents of the JAR file. eg: 1) jar tvf MenuTest.jar v---Produces verbose output to stdout.
(3) 提取JAR檔案 jar xf jar-file [archived-file(s)] x---want to extract files from the JAR archive. eg: 1) jar xf MenuTest.jar copy.gif(僅提取檔案copy.gif) 2) jar xf MenuTest.jar alex/copy.gif(僅提取目錄alex下的 檔案copy.gif) 3) jar xf MenuTest.jar(提取該JAR中的所有檔案或目錄)
(4) 更新JAR檔案 jar uf jar-file input-file(s) u---want to update an existing JAR file. eg: 1) jar uf MenuTest.jar copy.gif (5) 索引JAR檔案 jar i jar-file i---index an existing JAR file. eg: 1) jar i MenuTest.jar
清單檔案
⚫ 每個JAR檔案中包含一個用於描述歸檔特徵的清單檔案(manifest)。清單檔案被命名為MANIFEST.MF,它位於JAR檔案的一個特殊的META-INF子目錄中。
⚫ 最小的符合標準的清單檔案是很簡單的:Manifest-Version:1.0複雜的清單檔案包含多個條目,這些條目被分成多個節。第一節被稱為主節,作用於整個JAR檔案。隨後的條目用來指定已命名條目的屬性,可以是檔案、包或者URL。
⚫ 清單檔案的節與節之間用空行分開,最後一行必須以換行符結束。否則,清單檔案將無法被正確地讀取。
– 建立一個包含清單的JAR檔案,應該執行:
jar cfm MyArchive.jar manifest.mf com/*.class
– 要更新一個已有JAR檔案的清單,則需要將增加的部分
放置到一個文字檔案中,執行如下命令:
jar ufm MyArchive.jar manifest-additions.mf
執行JAR檔案
⚫ 使用者可以通過下面的命令來啟動應用程式:
java –jar MyProgram.jar
⚫ 視窗作業系統,可通過雙擊JAR檔案圖示來啟動應用程式。
資源
⚫ Java中,應用程式使用的類通常需要一些相關的資料檔案,這些檔案稱為資源(Resource)。
–影象和聲音檔案。
–帶有訊息字串和按鈕標籤的文字檔案。
–二進位制資料檔案,如:描述地圖佈局的檔案。
⚫ 類載入器知道如何搜尋類檔案,直到在類路徑、存檔檔案或Web伺服器上找到為止。
⚫ 利用資源機制對於非類檔案也可以進行同樣操作,具體步驟如下:
– 獲得資源的Class物件。
– 如果資源是一個影象或聲音檔案,那麼就需要呼叫getresource(filename)獲得資源的URL位置,然後利用getImage或getAudioClip方法進行讀取。
– 如果資源是文字或二進位制檔案,那麼就可以使用getResouceAsStream方法讀取檔案中的資料。
⚫ 資原始檔可以與類檔案放在同一個目錄中,也可以將資原始檔放在其它子目錄中。具體有以下兩種方式:
–相對資源名:如data/text/about.txt它會被解釋為相對於載入這個資源的類所在的包。
–絕對資源名:如/corejava/title.txt ⚫ ResourceTest.java程式演示了資源載入的過程。 ⚫ 編譯、建立JAR檔案和執行這個程式的命令如下: – javac ResourceTest.java – jar cvfm ResourceTest.jar ResourceTest.mf *.class *.gif *.txt – java –jar ResourceTest.jar
1、實驗目的與要求
(1) 掌握Java應用程式的打包操作;
(2) 瞭解應用程式儲存配置資訊的兩種方法;
(3) 掌握基於JNLP協議的java Web Start應用程式的釋出方法;
(5) 掌握Java GUI 程式設計技術。
2.實驗部分
實驗1: 匯入第13章示例程式,測試程式並進行程式碼註釋。
測試程式1
l 在elipse IDE中除錯執行教材585頁程式13-1,結合程式執行結果理解程式;
l 將所生成的JAR檔案移到另外一個不同的目錄中,再執行該歸檔檔案,以便確認程式是從JAR檔案中,而不是從當前目錄中讀取的資源。
l 掌握建立JAR檔案的方法;
package resource; import java.awt.*; import java.io.*; import java.net.*; import java.util.*; import javax.swing.*; /** * @version 1.41 2015-06-12 * @author Cay Horstmann */ public class ResourceTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { JFrame frame = new ResourceTestFrame(); frame.setTitle("ResourceTest"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } } /** * A frame that loads image and text resources. */ class ResourceTestFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 300; public ResourceTestFrame() { setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); URL aboutURL = getClass().getResource("about.gif"); Image img = new ImageIcon(aboutURL).getImage(); setIconImage(img); JTextArea textArea = new JTextArea(); InputStream stream = getClass().getResourceAsStream("about.txt"); try (Scanner in = new Scanner(stream, "UTF-8")) { while (in.hasNext()) textArea.append(in.nextLine() + "\n"); } add(textArea); } }
測試程式2
l 在elipse IDE中除錯執行教材583頁-584程式13-2,結合程式執行結果理解程式;
l 瞭解Properties類中常用的方法;
package properties; import java.awt.EventQueue; import java.awt.event.*; import java.io.*; import java.util.Properties; import javax.swing.*; /** * A program to test properties. The program remembers the frame position, size, * and title. * @version 1.01 2015-06-16 * @author Cay Horstmann */ public class PropertiesTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { PropertiesFrame frame = new PropertiesFrame(); frame.setVisible(true); }); } } /** * A frame that restores position and size from a properties file and updates * the properties upon exit. */ class PropertiesFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 200; private File propertiesFile; private Properties settings; public PropertiesFrame() { // 從屬性中獲取位置、大小和標題 String userDir = System.getProperty("user.home"); File propertiesDir = new File(userDir, ".corejava"); if (!propertiesDir.exists()) propertiesDir.mkdir(); propertiesFile = new File(propertiesDir, "program.properties"); Properties defaultSettings = new Properties(); defaultSettings.setProperty("left", "0"); defaultSettings.setProperty("top", "0"); defaultSettings.setProperty("width", "" + DEFAULT_WIDTH); defaultSettings.setProperty("height", "" + DEFAULT_HEIGHT); defaultSettings.setProperty("title", ""); settings = new Properties(defaultSettings); if (propertiesFile.exists()) try (InputStream in = new FileInputStream(propertiesFile)) { settings.load(in); } catch (IOException ex) { ex.printStackTrace(); } int left = Integer.parseInt(settings.getProperty("left")); int top = Integer.parseInt(settings.getProperty("top")); int width = Integer.parseInt(settings.getProperty("width")); int height = Integer.parseInt(settings.getProperty("height")); setBounds(left, top, width, height); // 如果沒有標題,詢問使用者 String title = settings.getProperty("title"); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); //新增指定的視窗偵聽器,以從此視窗接收視窗事件。 addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent event) { settings.setProperty("left", "" + getX()); settings.setProperty("top", "" + getY()); settings.setProperty("width", "" + getWidth()); settings.setProperty("height", "" + getHeight()); settings.setProperty("title", getTitle()); try (OutputStream out = new FileOutputStream(propertiesFile)) { settings.store(out, "Program Properties"); } catch (IOException ex) { ex.printStackTrace(); } System.exit(0); } }); } }
測試結果如下所示
測試程式3
l 在elipse IDE中除錯執行教材593頁-594程式13-3,結合程式執行結果理解程式;
l 瞭解Preferences類中常用的方法;
package preferences; import java.awt.*; import java.io.*; import java.util.prefs.*; import javax.swing.*; import javax.swing.filechooser.*; /** * A program to test preference settings. The program remembers the frame * position, size, and title. * @version 1.03 2015-06-12 * @author Cay Horstmann */ public class PreferencesTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { PreferencesFrame frame = new PreferencesFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } } /** * A frame that restores position and size from user preferences and updates the * preferences upon exit. */ class PreferencesFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 200; private Preferences root = Preferences.userRoot(); private Preferences node = root.node("/com/horstmann/corejava"); public PreferencesFrame() { // get position, size, title from preferences int left = node.getInt("left", 0); int top = node.getInt("top", 0); int width = node.getInt("width", DEFAULT_WIDTH); int height = node.getInt("height", DEFAULT_HEIGHT); setBounds(left, top, width, height); // if no title given, ask user String title = node.get("title", ""); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); // 設定顯示XML檔案的檔案選擇器 final JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.setFileFilter(new FileNameExtensionFilter("XML files", "xml")); // 設定選單 JMenuBar menuBar = new JMenuBar(); setJMenuBar(menuBar); JMenu menu = new JMenu("File"); menuBar.add(menu); JMenuItem exportItem = new JMenuItem("Export preferences"); menu.add(exportItem); exportItem .addActionListener(event -> { if (chooser.showSaveDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION) { try { savePreferences(); OutputStream out = new FileOutputStream(chooser .getSelectedFile()); node.exportSubtree(out); out.close(); } catch (Exception e) { e.printStackTrace(); } } }); JMenuItem importItem = new JMenuItem("Import preferences"); menu.add(importItem); importItem .addActionListener(event -> { if (chooser.showOpenDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION) { try { InputStream in = new FileInputStream(chooser .getSelectedFile()); Preferences.importPreferences(in); in.close(); } catch (Exception e) { e.printStackTrace(); } } }); JMenuItem exitItem = new JMenuItem("Exit"); menu.add(exitItem); exitItem.addActionListener(event -> { savePreferences(); System.exit(0); }); } public void savePreferences() { node.putInt("left", getX()); node.putInt("top", getY()); node.putInt("width", getWidth()); node.putInt("height", getHeight()); node.put("title", getTitle()); } }
測試結果如下所示
測試程式4
l 在elipse IDE中除錯執行教材619頁-622程式13-6,結合程式執行結果理解程式;
l 掌握基於JNLP協議的java Web Start應用程式的釋出方法。
package webstart; import java.awt.*; import javax.swing.*; /** * A calculator with a calculation history that can be deployed as a Java Web Start application. * @version 1.04 2015-06-12 * @author Cay Horstmann */ public class Calculator { public static void main(String[] args) { EventQueue.invokeLater(() -> { CalculatorFrame frame = new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package webstart; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintStream; import java.net.MalformedURLException; import java.net.URL; import javax.jnlp.BasicService; import javax.jnlp.FileContents; import javax.jnlp.FileOpenService; import javax.jnlp.FileSaveService; import javax.jnlp.PersistenceService; import javax.jnlp.ServiceManager; import javax.jnlp.UnavailableServiceException; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; /** * A frame with a calculator panel and a menu to load and save the calculator history. */ public class CalculatorFrame extends JFrame { private CalculatorPanel panel; public CalculatorFrame() { setTitle(); panel = new CalculatorPanel(); add(panel); JMenu fileMenu = new JMenu("File"); JMenuBar menuBar = new JMenuBar(); menuBar.add(fileMenu); setJMenuBar(menuBar); JMenuItem openItem = fileMenu.add("Open"); openItem.addActionListener(event -> open()); JMenuItem saveItem = fileMenu.add("Save"); saveItem.addActionListener(event -> save()); pack(); } /** * Gets the title from the persistent store or asks the user for the title if there is no prior * entry. */ public void setTitle() { try { String title = null; BasicService basic = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService"); URL codeBase = basic.getCodeBase(); PersistenceService service = (PersistenceService) ServiceManager .lookup("javax.jnlp.PersistenceService"); URL key = new URL(codeBase, "title"); try { FileContents contents = service.get(key); InputStream in = contents.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); title = reader.readLine(); } catch (FileNotFoundException e) { title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) return; service.create(key, 100); FileContents contents = service.get(key); OutputStream out = contents.getOutputStream(true); PrintStream printOut = new PrintStream(out); printOut.print(title); } setTitle(title); } catch (UnavailableServiceException | IOException e) { JOptionPane.showMessageDialog(this, e); } } /** * Opens a history file and updates the display. */ public void open() { try { FileOpenService service = (FileOpenService) ServiceManager .lookup("javax.jnlp.FileOpenService"); FileContents contents = service.openFileDialog(".", new String[] { "txt" }); JOptionPane.showMessageDialog(this, contents.getName()); if (contents != null) { InputStream in = contents.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line; while ((line = reader.readLine()) != null) { panel.append(line); panel.append("\n"); } } } catch (UnavailableServiceException e) { JOptionPane.showMessageDialog(this, e); } catch (IOException e) { JOptionPane.showMessageDialog(this, e); } } /** * Saves the calculator history to a file. */ public void save() { try { ByteArrayOutputStream out = new ByteArrayOutputStream(); PrintStream printOut = new PrintStream(out); printOut.print(panel.getText()); InputStream data = new ByteArrayInputStream(out.toByteArray()); FileSaveService service = (FileSaveService) ServiceManager .lookup("javax.jnlp.FileSaveService"); service.saveFileDialog(".", new String[] { "txt" }, data, "calc.txt"); } catch (UnavailableServiceException e) { JOptionPane.showMessageDialog(this, e); } catch (IOException e) { JOptionPane.showMessageDialog(this, e); } } }
package webstart; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; /** A panel with calculator buttons and a result display. */ public class CalculatorPanel extends JPanel { private JTextArea display; private JPanel panel; private double result; private String lastCommand; private boolean start; /** Lays out the panel. */ public CalculatorPanel() { setLayout(new BorderLayout()); result = 0; lastCommand = "="; start = true; // add the display display = new JTextArea(10, 20); add(new JScrollPane(display), BorderLayout.NORTH); ActionListener insert = new InsertAction(); ActionListener command = new CommandAction(); // add the buttons in a 4 x 4 grid panel = new JPanel(); panel.setLayout(new GridLayout(4, 4)); addButton("7", insert); addButton("8", insert); addButton("9", insert); addButton("/", command); addButton("4", insert); addButton("5", insert); addButton("6", insert); addButton("*", command); addButton("1", insert); addButton("2", insert); addButton("3", insert); addButton("-", command); addButton("0", insert); addButton(".", insert); addButton("=", command); addButton("+", command); add(panel, BorderLayout.CENTER); } /** Gets the history text. @return the calculator history */ public String getText() { return display.getText(); } /** Appends a string to the history text. @param s the string to append */ public void append(String s) { display.append(s); } /** Adds a button to the center panel. @param label the button label @param listener the button listener */ private void addButton(String label, ActionListener listener) { JButton button = new JButton(label); button.addActionListener(listener); panel.add(button); } /** This action inserts the button action string to the end of the display text. */ private class InsertAction implements ActionListener { public void actionPerformed(ActionEvent event) { String input = event.getActionCommand(); start = false; display.append(input); } } /** This action executes the command that the button action string denotes. */ private class CommandAction implements ActionListener { public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); if (start) { if (command.equals("-")) { display.append(command); start = false; } else lastCommand = command; } else { try { int lines = display.getLineCount(); int lineStart = display.getLineStartOffset(lines - 1); int lineEnd = display.getLineEndOffset(lines - 1); String value = display.getText(lineStart, lineEnd - lineStart); display.append(" "); display.append(command); calculate(Double.parseDouble(value)); if (command.equals("=")) display.append("\n" + result); lastCommand = command; display.append("\n"); start = true; } catch (BadLocationException e) { e.printStackTrace(); } } } } /** Carries out the pending calculation. @param x the value to be accumulated with the prior result. */ public void calculate(double x) { if (lastCommand.equals("+")) result += x; else if (lastCommand.equals("-")) result -= x; else if (lastCommand.equals("*")) result *= x; else if (lastCommand.equals("/")) result /= x; else if (lastCommand.equals("=")) result = x; } }
程式碼出現錯誤
實驗2:GUI綜合程式設計練習
按實驗十四分組名單,組內討論完成以下程式設計任務:
練習1:採用GUI介面設計以下程式,並進行部署與釋出:
l 編制一個程式,將身份證號.txt 中的資訊讀入到記憶體中;
l 按姓名字典序輸出人員資訊;
l 查詢最大年齡的人員資訊;
l 查詢最小年齡人員資訊;
l 輸入你的年齡,查詢身份證號.txt中年齡與你最近人的姓名、身份證號、年齡、性別和出生地;
l 查詢人員中是否有你的同鄉。
l 輸入身份證資訊,查詢所提供身份證號的人員資訊,要求輸入一個身份證數字時,查詢介面就顯示滿足查詢條件的查詢結果,且隨著輸入的數字的增多,查詢匹配的範圍逐漸縮小。
package demo1;
import java.awt.*;
import javax.swing.*; public class ButtonTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { JFrame frame = new Main(); frame.setTitle("身份證"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package demo1;
import java.io.BufferedReader;
import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Scanner; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Main extends JFrame { private static ArrayList<Student> studentlist; private static ArrayList<Student> list; private JPanel panel; private JPanel buttonPanel; private static final int DEFAULT_WITH = 600; private static final int DEFAULT_HEIGHT = 300; public Main() { studentlist = new ArrayList<>(); Scanner scanner = new Scanner(System.in); File file = new File("C:\\Users\\ASUS\\Desktop\\身份證號.txt"); try { FileInputStream fis = new FileInputStream(file); BufferedReader in = new BufferedReader(new InputStreamReader(fis)); String temp = null; while ((temp = in.readLine()) != null) { Scanner linescanner = new Scanner(temp); linescanner.useDelimiter(" "); String name = linescanner.next(); String number = linescanner.next(); String sex = linescanner.next(); String age = linescanner.next(); String province = linescanner.nextLine(); Student student = new Student(); student.setName(name); student.setnumber(number); student.setsex(sex); int a = Integer.parseInt(age); student.setage(a); student.setprovince(province); studentlist.add(student); } } catch (FileNotFoundException e) { System.out.println("學生資訊檔案找不到"); e.printStackTrace(); } catch (IOException e) { System.out.println("學生資訊檔案讀取錯誤"); e.printStackTrace(); } panel = new JPanel(); panel.setLayout(new BorderLayout()); JTextArea jt = new JTextArea(); panel.add(jt); add(panel, BorderLayout.NORTH); buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(1, 7)); JButton jButton = new JButton("字典排序"); JButton jButton1 = new JButton("年齡最大和年齡最小"); JLabel lab = new JLabel("猜猜你的老鄉"); JTextField jt1 = new JTextField(); JLabel lab1 = new JLabel("找找同齡人(年齡相近):"); JTextField jt2 = new JTextField(); JLabel lab2 = new JLabel("輸入你的身份證號碼:"); JTextField jt3 = new JTextField(); JButton jButton2 = new JButton("退出"); jButton.setBounds(110, 90, 60, 30); jButton1.setBounds(110, 90, 60, 30); jt1.setBounds(110, 90, 60, 30); jt2.setBounds(110, 90, 60, 30); jt3.setBounds(110, 90, 60, 30); jButton2.setBounds(110, 90, 60, 30); jButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Collections.sort(studentlist); jt.setText(studentlist.toString()); } }); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int max = 0, min = 100; int j, k1 = 0, k2 = 0; for (int i = 1; i < studentlist.size(); i++) { j = studentlist.get(i).getage(); if (j > max) { max = j; k1 = i; } if (j < min) { min = j; k2 = i; } } jt.setText("年齡最大:" + studentlist.get(k1) + "年齡最小:" + studentlist.get(k2)); } }); jButton2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dispose(); System.exit(0); } }); jt1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String find = jt1.getText(); String text=""; String place = find.substring(0, 3); for (int i = 0; i < studentlist.size(); i++) { if (studentlist.get(i).getprovince().substring(1, 4).equals(place)) { text+="\n"+studentlist.get(i); jt.setText("老鄉:" + text); } } } }); jt2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String yourage = jt2.getText(); int a = Integer.parseInt(yourage); int near = agenear(a); int value = a - studentlist.get(near).getage(); jt.setText("年齡相近:" + studentlist.get(near)); } }); jt3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { list = new ArrayList<>(); Collections.sort(studentlist); String key = jt3.getText(); for (int i = 1; i < studentlist.size(); i++) { if (studentlist.get(i).getnumber().contains(key)) { list.add(studentlist.get(i)); jt.setText("emmm!你可能是:\n" + list); //System.out.println("可能的人:" + studentlist.get(i)); //jt.setText("可能的人:" + studentlist.get(i)); } } } }); buttonPanel.add(jButton); buttonPanel.add(jButton1); buttonPanel.add(lab); buttonPanel.add(jt1); buttonPanel.add(lab1); buttonPanel.add(jt2); buttonPanel.add(lab2); buttonPanel.add(jt3); buttonPanel.add(jButton2); add(buttonPanel, BorderLayout.SOUTH); setSize(DEFAULT_WITH, DEFAULT_HEIGHT); } public static int agenear(int age) { int min = 53, value = 0, k = 0; for (int i = 0; i < studentlist.size(); i++) { value = studentlist.get(i).getage() - age; if (value < 0) value = -value; if (value < min) { min = value; k = i; } } return k; } }
package demo1;
public class Student implements Comparable<Student> { private String name; private String number ; private String sex ; private int age; private String province; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getnumber() { return number; } public void setnumber(String number) { this.number = number; } public String getsex() { return sex ; } public void setsex(String sex ) { this.sex =sex ; } public int getage() { return age; } public void setage(int age) { // int a = Integer.parseInt(age); this.age= age; } public String getprovince() { return province; } public void setprovince(String province) { this.province=province ; } public int compareTo(Student o) { return this.name.compareTo(o.getName()); } public String toString() { return name+"\t"+sex+"\t"+age+"\t"+number+"\t"+province+"\n"; } }
執行結果:
字典排序:
1.查詢最大年齡的人員資訊;
2.查詢最小年齡人員資訊;
找老鄉:
年齡相近的人:
輸入身份證資訊,查詢所提供身份證號的人員資訊,要求輸入一個身份證數字時,查詢介面就顯示滿足查詢條件的查詢結果,且隨著輸入的數字的增多,查詢匹配的範圍逐漸縮小。
輸入數字2時:
輸入數字26時:
輸入數字265時:
練習2:採用GUI介面設計以下程式,並進行部署與釋出
l 編寫一個計算器類,可以完成加、減、乘、除的操作
l 利用計算機類,設計一個小學生100以內數的四則運算練習程式,由計算機隨機產生10道加減乘除練習題,學生輸入答案,由程式檢查答案是否正確,每道題正確計10分,錯誤不計分,10道題測試結束後給出測試總分;
l 將程式中測試練習題及學生答題結果輸出到檔案,檔名為test.txt。
package ui_test;
import java.awt.*;
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import javax.swing.*; public class MyExGUI extends JFrame { ArrayList<String> user_zongti = new ArrayList<String>(); ArrayList<String> user_zonganswer = new ArrayList<String>(); ArrayList<String> user_answer = new ArrayList<String>(); ArrayList<String> true_answer = new ArrayList<String>(); ArrayList<String> jta_timu = new ArrayList<String>(); ArrayList<String> jta_zong = new ArrayList<String>(); ArrayList<Integer> user_fenshu = new ArrayList<Integer>(); JMenuBar jm; // 選單條元件 JMenu menu;// 選單 JMenuItem item1, item2;// 選單項 JMenu build; // 二級選單 JMenuItem file, project; TextArea answer_all = new TextArea(); TextField jta = new TextField(); TextField jta_answer = new TextField(); JLabel num_answer = new JLabel(); JLabel answer; JToolBar jtb;// 工具條 JButton jb1, jb2, jb3, jb4, jb5, jb6, jb7, jb_next; int answer_count; int answer_fenshu; public MyExGUI() { // 建立選單 jm = new JMenuBar(); menu = new JMenu("檔案(F)"); menu.setMnemonic('f'); // 助記符 build = new JMenu("新建"); file = new JMenuItem("檔案"); project = new JMenuItem("答題"); item1 = new JMenuItem("儲存(S)"); item2 = new JMenuItem("退出"); answer = new JLabel("第 1 題"); // 新增選單項至選單上 build.add(file); build.add(project); menu.add(build); menu.add(item1); menu.add(item2); menu.addSeparator(); // 將選單加入至選單欄 jm.add(menu); JPanel contentPanel = new JPanel(); contentPanel.setLayout(null); JLabel daan = new JLabel("答案"); JLabel dengyu = new JLabel("="); num_answer = answer; num_answer.setFont(new Font("宋體", Font.BOLD, 22)); jb_next = new JButton("下一題"); jta.setFont(new Font("宋體", Font.BOLD, 22)); jta_answer.setFont(new Font("宋體", Font.BOLD, 22)); jb_next.setFont(new Font("宋體", Font.BOLD, 22)); daan.setFont(new Font("宋體", Font.BOLD, 22)); dengyu.setFont(new Font("宋體", Font.BOLD, 22)); contentPanel.add(num_answer); contentPanel.add(daan); contentPanel.add(dengyu); contentPanel.add(jta); contentPanel.add(jta_answer); contentPanel.add(answer_all); contentPanel.add(jb_next); num_answer.setBounds(90, 20, 130, 50); daan.setBounds(250, 20, 90, 50); jta.setBounds(50, 70, 150, 30); dengyu.setBounds(205, 70, 20, 20); jta_answer.setBounds(230, 70, 100, 30); jb_next.setBounds(350, 70, 110, 30); answer_all.setBounds(50, 120, 400, 300); this.setJMenuBar(jm); // 新增選單欄,不能設定位置,會自動放在最上部 this.add(contentPanel); this.setTitle("線上答題系統"); this.setSize(600, 500); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); item1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { FileOutputStream outSTr = null; BufferedOutputStream Buff = null; boolean flag = true; File file; // String test ; do { // test = "test"+count; String inputValue = JOptionPane.showInputDialog("Please input file name"); file = new File(inputValue + "test.txt"); if (!file.exists()) { // 建立檔案 try { flag = file.createNewFile(); } catch (IOException e) { e.printStackTrace(); } flag = false; } else { JOptionPane.showMessageDialog(null, "該檔名已存在,請重新輸入", "ERROR", JOptionPane.ERROR_MESSAGE); flag = true; } } while (flag); // 寫入檔案 String u_answer; try { outSTr = new FileOutputStream(file); Buff = new BufferedOutputStream(outSTr); System.out.println("選擇是後執行的程式碼" + user_zongti.size() + user_answer.size()); for (int i = 0; i < user_zongti.size(); i++) { try { Buff.write(user_zongti.get(i).getBytes()); Buff.write(" ".getBytes()); u_answer = user_answer.get(i); if (u_answer.equals("")) u_answer = "沒有作答"; Buff.write(u_answer.getBytes()); Buff.write("\r\n".getBytes()); } catch (IOException e) { e.printStackTrace(); i--; } } Buff.flush(); Buff.close(); } catch (IOException e) { e.printStackTrace(); } try { outSTr.close(); } catch (IOException e) { e.printStackTrace(); } user_zongti.clear(); user_answer.clear(); } }); project.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { arithmetic art = new arithmetic(); true_answer = art.list_answer; jta_timu = art.list_timu; jta_zong = art.list; answer_count = 1; answer_all.setText(""); for (int i = 0; i < art.list_timu.size(); i++) { user_zongti.add(jta_zong.get(i)); answer_all.append(jta_timu.get(i)); answer_all.append("\r\n"); } num_answer.setText("第 " + answer_count + " 題"); jta.setText(jta_timu.get(answer_count - 1)); answer_count++; } }); jb_next.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String temp; temp = jta_answer.getText(); if (jta.getText().equals("")) { JOptionPane.showMessageDialog(null, "錯誤,請匯入題庫", "錯誤", JOptionPane.ERROR_MESSAGE); return; } jta_answer.setText(""); if (answer_count <= 10) { if (isInteger(temp)) { user_answer.add(temp); System.out.println("選擇否後執行的程式碼" + temp + "user_size" + user_answer.size()); num_answer.setText("第 " + answer_count + " 題"); jta.setText(jta_timu.get(answer_count - 1)); answer_count++; }