java中的sort()

import java.util.*;

public class CollectionTest{
	
	public static void main(String[] args){
		
		List l = new ArrayList();
		
		l.add(10);
		l.add(1);
		l.add(0);
		l.add(120);
		
		for(Iterator it=l.iterator();it.hasNext();){
			System.out.println(it.next());//输出为10,1,0,120
		}

		
		Iterator it = l.iterator();
		
		Collections.sort(l);
		
		it = l.iterator();
		
		while(it.hasNext()){
			System.out.println(it.next());//输出为0,1,10,120,sort()对集合进行了排序
		}
		
		
	}
}