List set 排序算法改写_list中添加独享并实现排序-优快云博客

本文提供了一个使用Java对List和Set中的自定义对象进行排序的例子。通过实现Comparator接口，可以根据对象的不同属性（如ID和年龄）进行升序或降序排列。

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list的排序算法改写

public class Main2 {

	public static void main(String[] args) {
		List<student> l = new ArrayList<student>();
		student stu1 = new student("001","aaa",18);
		student stu2 = new student("002","bbb",19);
		student stu3 = new student("003","ccc",22);
		student stu4 = new student("004","ddd",14);
		student stu5 = new student("005","eee",17);
		
		l.add(stu1);
		l.add(stu4);
		l.add(stu3);
		l.add(stu5);
		l.add(stu2);
		
		Iterator<student> it = l.iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
		//排序
		System.out.println("-----------qian----------");
		Collections.sort(l, new Comparator<student>() {

			@Override
			public int compare(student o1, student o2) {
				if(o1.ID.compareTo(o2.ID)==0){
					return o2.age-o1.age;
				}
				return o2.ID.compareTo(o1.ID);//从大到小   o1在前是从小到大
			}
		});
		
		Iterator<student> it1 = l.iterator();
		while(it1.hasNext()){
			System.out.println(it1.next());
		}
		System.out.println("-----------hou----------");
	}

}

set的排序算法改写


public class Main {

	public static void main(String[] args) {
		Set<student> setlist = new HashSet<student>();
		student stu1 = new student("001","abc",18);
		student stu2 = new student("002","def",18);
		student stu3 = new student("003","hhh",18);
		student stu4 = new student("001","abc",18);
		
		setlist.add(stu1);
		setlist.add(stu2);
		setlist.add(stu3);
		setlist.add(stu4);
		System.out.println(stu1.equals(stu4));//判断stu1与stu2是否一样
		
		Iterator<student> it = setlist.iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
		
		List<student> list = new ArrayList<student>(setlist);
		System.out.println("-----------qian----------");
		Collections.sort(list, new Comparator<student>() {

			@Override
			public int compare(student o1, student o2) {
				if(o1.ID.compareTo(o2.ID)==0){
					return o2.age-o1.age;
				}
				return o2.ID.compareTo(o1.ID);//从大到小   o1在前是从小到大
			}
		});
		
		Iterator<student> it1 = list.iterator();
		while(it1.hasNext()){
			System.out.println(it1.next());
		}
		System.out.println("-----------hou----------");

	}

}