标签：黑马程序员   java基础   treeset   

TreeSet集合中储存学生对象，按照其年龄进行排序

import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.TreeSet;
public class SortListDemos 
{
	public static void main(String[] args) 
	{
		// 
		//linkhashsetdemos();
    	//treesetdemos();
		treesetStudentdemos();
	}
	private static void treesetStudentdemos() {
		// 储存学生对象，依据其年龄排序，如果年龄下同，再比较其姓名
		TreeSet ts = new TreeSet();
		ts.add(new MinStudent("ccc",22));
		ts.add(new MinStudent("ddd",22));
		ts.add(new MinStudent("aaa",21));
		ts.add(new MinStudent("dad",23));
		ts.add(new MinStudent("fff",25));
		ts.add(new MinStudent("sss",22));
		ts.add(new MinStudent("jjj",20));
		Iterator it = ts.iterator();
		while(it.hasNext())
		{
			MinStudent ms = (MinStudent)it.next();
			System.out.println(ms.toString());
		}
	}
	private static void treesetdemos() {
		// TODO Auto-generated method stub
		TreeSet ts = new TreeSet();
		ts.add("abd");
		ts.add("kkk");
		ts.add("hhg");
		ts.add("eee");
		ts.add("abd");
		System.out.println("TreeSet :"+ts);
	}
	private static void linkhashsetdemos() {
		// TODO Auto-generated method stub
		HashSet lhs = new LinkedHashSet();
		//添加元素
		lhs.add("abd");
		lhs.add("kkk");
		lhs.add("hhg");
		lhs.add("eee");
		lhs.add("abd");
		System.out.println("HashSet:"+lhs);
		
	}

}
class MinStudent implements Comparable
{

	public int getName;
	private String name ;
	private int age;
	MinStudent(String name ,int age)
	{
		this.name =  name ;
		this.age=age;
	}
	public int getAge()
	{
		return age;
	}
	public String getName()
	{
		return name;
	}
	public String toString()
	{
		return "name:"+name +" --- age"+age;
			
	}

	@Override
	public int compareTo(Object o) {
		// 
		MinStudent s =(MinStudent) o;
		//先按照年龄排序
		int i=this.getAge()-s.getAge();
		if(i ==0)
			return this.getName().compareTo(s.getName());
		return i;
	}
	
	}

运行方法：treesetStudentdemos();

运行方法：linkhashsetdemos();
     treesetdemos();

黑马程序员——java——TreeSet集合中储存学生对象，按照其年龄进行排序

标签：黑马程序员   java基础   treeset   

原文地址：http://blog.csdn.net/zl18603543572/article/details/46558809