Java 字符串操作

import java.util.Scanner;

public class Operation{
    public static void main(String args[]){
        String s="Java 技术学习班 20070326";
        String s2="MLDN JAVA";
        String s3="Java 技术学习班 20070326 MLDN 老师";
        System.out.println(s.substring(11));
        System.out.println(s2.replaceAll("JAVA","J2EE"));
        System.out.println(s.charAt(8));
        System.out.println(s.replaceAll("0",""));
        System.out.println(s3.replaceAll(" ",""));
        Scanner a=new Scanner(System.in);
        String b=a.next();
        System.out.println(b.substring(6,14));

    }
}