電話本管理系統 

  1.主介面

大體就是要實現對電話本的增刪改查：

因為不清楚要儲存的資料的數量，所以可以使用ArrayList不定長陣列去實現，也可以使用集合類去做，此題我用Map集合來做。

廢話不多說，直接上程式碼：

PhoneInfo類定義了一些屬性，變數及構造方法

public class PhoneInfo {
	private String name;
	private String sex;
	private String age;
	private String tel;
	private String qq;
	private String address;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

	public String getTel() {
		return tel;
	}

	public void setTel(String tel) {
		this.tel = tel;
	}

	public String getQq() {
		return qq;
	}

	public void setQq(String qq) {
		this.qq = qq;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public PhoneInfo(String name, String sex, String age, String tel, String qq, String address) {
		super();
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.tel = tel;
		this.qq = qq;
		this.address = address;
	}

	@Override
	public String toString() {
		return "PhoneInfo [name=" + name + ", sex=" + sex + ", age=" + age + ", tel=" + tel + ", qq=" + qq
				+ ", address=" + address + "]";
	}

}
 

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class TelBook {
	static Scanner sc = new Scanner(System.in);
	static TelBook tb = new TelBook();
	Map map = new HashMap<>();	
	public static void main(String[] args) {
		System.out.println("————————————————————電話本管理系統——————————————————");
		System.out.println("1.新增       2.刪除       3.修改       4.查詢所有       5.根據姓名查詢      0.退出");
		System.out.println("————————————————————電話本管理系統——————————————————");
		int option;
		do {
		System.out.println("請選擇業務");
		option = sc.nextInt();
		switch (option) {
		case 1:
			
			tb.add();
			break;
		case 2:
			tb.delete();
			break;
		case 3:
			tb.modify();
			break;
		case 4:
			tb.find();
			break;
		case 5:
			tb.findName();
			break;
		case 0:
			System.out.println("電話本系統結束");
			break;
		default:

		}}
		while(option!=0);
	}
	public void add() {
		System.out.println("———————————新增電話本————————————");
		shuru();
		Set set = map.entrySet();
		Iterator it = set.iterator();
		while (it.hasNext()) {
			Map.Entry mapEntry = (Map.Entry) it.next();
			System.out.print(mapEntry.getKey() + "   " + mapEntry.getValue());
		}
		System.out.println();
		System.out.println("新增成功");

	}
	public void delete() {
		System.out.println("————————————刪除電話本——————————————");
		System.out.println("請輸入要刪除的姓名");
	    String deleteName = sc.next();
	        if(map.containsValue(deleteName)) {
	        	map.remove(deleteName);
	        	System.out.println("刪除成功");
	        }else 
	        	System.out.println("使用者不存在！");
		
	}
	public void modify() {
		System.out.println("————————————修改電話本——————————————");
		System.out.println("請輸入要修改的姓名");
        String modifyName = sc.next();
        if(map.containsValue(modifyName)) {
        map.remove(modifyName);
            shuru(); 
            Set set = map.entrySet();
		Iterator it = set.iterator();
		while (it.hasNext()) {
			Map.Entry mapEntry = (Map.Entry) it.next();
			System.out.print(mapEntry.getKey() + "   " + mapEntry.getValue());
		}
		System.out.println();
        }
        else {
        	System.out.println("使用者不存在");
        }   
		
	}
	public void find() {
		System.out.println("——————————————查詢所有——————————————");
		/* Set set = map.entrySet();
			Iterator it = set.iterator();
			while (it.hasNext()) {
				Map.Entry mapEntry = (Map.Entry) it.next();
				System.out.print(mapEntry.getKey() + "   " + mapEntry.getValue());
			}*/
		Set<String> set = map.keySet();
		for(String s:set) {
			System.out.println(map.get(s).toString());
		}
	}
	public void findName() {
		System.out.println("————————————根據姓名查詢——————————————");
		System.out.println("請輸入要查詢的姓名");
        String findName = sc.next();
        if(map.containsValue(findName)) {
        	  Set set = map.entrySet();
		Iterator it = set.iterator();
		while (it.hasNext()) {
			Map.Entry mapEntry = (Map.Entry) it.next();
			System.out.print(mapEntry.getKey() + "   " + mapEntry.getValue());
		}
		System.out.println();
        }
        else {
        	System.out.println("使用者不存在");
        }
      
        
	}
	public void shuru() {
		PhoneInfo p = new PhoneInfo("", "", "", "", "", "");
		System.out.print("姓名：");
		String name = sc.next();
		p.setName(name);
		map.put("姓名：", name);	
		System.out.println();
		System.out.print("性別：");
		String sex = sc.next();
		p.setSex(sex);
		map.put("性別：", sex);
		System.out.println();
		System.out.print("年齡：");
		String age = sc.next();
		p.setAge(age);
		map.put("年齡：", age);
		System.out.println();	
		System.out.print("電話：");
		String tel = sc.next();
		p.setTel(tel);
		map.put("電話：", tel);
		System.out.println();	
		System.out.print("QQ:");
		String qq = sc.next();
		p.setQq(qq);
		map.put("QQ：", qq);
		System.out.println();	
		System.out.print("地址：");
		String address = sc.next();
		p.setAddress(address);
		map.put("地址：", address);
		System.out.println();		
	}
	

}
 

部分程式碼截圖：

執行截圖：

寫在最後：從Map中獲取元素一定要注意是Key值還是Value值，修改時要先remove.