Java 去除ArrayList集合中的重複元素。__Java

import java.util.*;class ArrayListTest {public static void sop(Object obj){System.out.println(obj);}public static void main(String[] args) {ArrayList al = new ArrayList();al.add("java01");al.add("java02");al.add("java01");al.add("java02");al.add("java01");//al.add("java03");/*在迭代時迴圈中next調用一次，就要hasNext判斷一次。Iterator it = al.iterator();while(it.hasNext()){sop(it.next()+"...."+it.next());}*/sop(al);al = singleElement(al);sop(al);}public static ArrayList singleElement(ArrayList al){//定義一個臨時容器。ArrayList newAl = new ArrayList();Iterator it = al.iterator();while(it.hasNext()){Object obj = it.next();if(!newAl.contains(obj))newAl.add(obj);}return newAl;}}