我给你写了一个例子
package com;

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

public class ArrayListTest {
public static void main(String[] args) {
List list = Collections.synchronizedList(new ArrayList());
list.add("abc");
list.add("bbsd");

    list.add("zdgdf");
    list.add("hhhhh");
    list.add("1234dsf");
    list.add("ZXCfdsf");

    //before sort
    for(String str:list){
        System.out.println(str);
    }

// after sort
System.out.println("*****************************");
Collections.sort(list, new ComparatorImpl());
for(String str:list){
System.out.println(str);
}
}
}

class ComparatorImpl implements Comparator{

public int compare(String string1, String string2) {
    return string1.compareTo(string2);
}

}

以下问题是关于ArrayList的，对我来说很有难度

iteye_566

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