回文數-時間變換-判斷郵箱
阿新 • • 發佈：2017-08-19
lap ole for 紐約 pac 其他 bre sta stat
*/");
return false;
}
if(s.indexOf("@")!=s.lastIndexOf("@")||s.indexOf(".")!=s.lastIndexOf(".")){
System.out.println("[email protected]");
return false;
}
if(s.indexOf("@")>s.indexOf(".")){
System.out.println("[email protected]");
}
for (int i = 0; i < s.indexOf("@"); i++) {
if((s.charAt(i)>=‘a‘&&s.charAt(i)<=‘z‘)||(s.charAt(i)>=‘A‘&&s.charAt(i)<=‘Z‘)){
}else{
System.out.println("用戶名含有其他字符");
return false;
}
}
return true;
}
public static void main(String[] args) {
Demo d = new Demo();
if(d.testEmail()){
System.out.println("用戶名合法");
}else {
System.out.println("用戶名不合法");
}
}
}
class huiwenshu
public class huiwenshu {
public static void main(String[] args) {
System.out.println("輸入...");
Scanner in = new Scanner(System.in);
String number = in.next();
boolean flag = true;
for(int i=0;i<number.trim().length()/2;i++){
if(!String.valueOf(number.charAt(i)).equals(String.valueOf(number.charAt(number.trim().length()-i-1)))){
flag = false;
break;
}
}
if(flag){
System.out.println("是滴");
}else{
System.out.println("no go away");
}
in.close();
}
}
/class ChangeTime
package 時間變換;
import java.util.Date;
import java.util.TimeZone;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class ChangeTime {
public static void main(String[] args) throws ParseException {
Date date=new Date();
SimpleDateFormat sdf3=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf3.setTimeZone(TimeZone.getTimeZone("GMT+8"));
System.out.println("beijig"+sdf3.format(date));
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("GMT+1"));
System.out.println("bali"+sdf.format(date));
SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf1.setTimeZone(TimeZone.getTimeZone("GMT-4"));
System.out.println("niuyue"+sdf1.format(date));
}
public void getTime(int year,int month,int date,int h,int m){
Calendar c = Calendar.getInstance();
//設置巴黎的時間
c.set(year, month, date, h-7, m);
System.out.println("巴黎時間："+c.get(Calendar.YEAR)+"年"+c.get(Calendar.MONTH)
+"月"+c.get(Calendar.DAY_OF_MONTH)+"日"+c.get(Calendar.HOUR_OF_DAY)+"點"+
c.get(Calendar.MINUTE)+"分");
//設置紐約時間
c.set(year, month, date, h-12, m);
System.out.println("紐約時間："+c.get(Calendar.YEAR)+"年"+c.get(Calendar.MONTH)
+"月"+c.get(Calendar.DAY_OF_MONTH)+"日"+c.get(Calendar.HOUR_OF_DAY)+"點"+
c.get(Calendar.MINUTE)+"分");
}
}
/class Demo
package 解析郵箱;
import java.util.Scanner;
public class Demo {
public boolean testEmail(){
System.out.println("請輸入一個郵箱~~~");
Scanner sc = new Scanner(System.in);
String s = sc.next();
if(s.indexOf("@")==-1||s.indexOf(".")==-1){
System.out.println("[email protected]
回文數-時間變換-判斷郵箱