代码如下

package testCollections;

import java.util.Random;

public class Initail {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Sort st = new Sort();
    Random random = new Random();

    int i = 0;
    //一共添加10次.
    do{
        String b=st.newString();
        if(st.addString(b)){
            i++;
        }else{
            continue;
        };
    }while(i

}

package testCollections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class Sort {
public List a ;

public Sort(){
    this.a= new ArrayList();
}

//生成一个新的字符串
public String newString(){
    String b = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" ;
    Random random = new Random();
    String newString = "" ;
            //从字符串b中挑选少于10个字符组成新的字符串.
    for(int j = 0;j

}

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