List去重

```java
package com.yd.test;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ListDemo01 {

	public static void main(String[] args) {
		List list=new ArrayList();
		list.add("A");
		list.add("B");
		list.add("C");
		list.add("A");
		list.add("A");
		list.add("B");
		System.out.println(list);
		
		//quChong01(list);
		quChong02(list);
		System.out.println(list);

	}
	//创建一个新集合，遍历原集合，将新集合没有的元素添加进来
	private static void quChong02(List list) {
		List temp=new ArrayList();
		for (Iterator it = list.iterator(); it.hasNext();) {
			Object obj =it.next();
			if(!temp.contains(obj)){
				temp.add(obj);
			}
			
		}
		list.clear();
		list.addAll(temp);
		
	}
	//选择排序法去重
	private static void quChong01(List list){
		for(int i=0;i<list.size()-1;i++){
			for(int j=i+1;j<list.size();j++){
				if(list.get(i).equals(list.get(j))){
					list.remove(j);
					j--;
				}
			}
		}
		
	}

}