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("郵箱沒有@或.");return false;}if(s.indexOf("@")!=s.lastIndexOf("@")||s.indexOf(".")!=s.lastIndexOf(".")){System.out.println("郵箱中含有多個@或.");return false;}if(s.indexOf("@")>s.indexOf(".")){System.out.println("郵箱中的.出現在@前面");}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");}}}

　　

轉載于:https://www.cnblogs.com/lc-java/p/7397149.html

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