list取出遵循放入顺序，set取出不遵循放入顺序

package com.pp.listAndSet;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import javax.naming.ldap.SortControl;

public class MainClass {

	public static void main(String[] args) {
		// List<Integer> list = new ArrayList<Integer>();
		// list.add(1);
		// list.add(2);
		// list.add(3);
		// for(Integer l:list) {
		// System.out.println(l);
		// }

		System.out.println("-------------");
		// Set<Integer> set = new HashSet<Integer>();
		// set.add(1);
		// set.add(2);
		// set.add(3);
		// set.add(4);
		// set.add(5);
		Person p0 = new Person("a", 1);
		Person p1 = new Person("b", 1);
		Person p2 = new Person("c", 1);
		Person p3 = new Person("d", 1);

		int a = p0.hashCode();
		int b = p1.hashCode();
		int c = p2.hashCode();
		int d = p3.hashCode();

		System.out.println("a.hashCode():" + p0.hashCode());
		System.out.println("b.hashCode():" + p1.hashCode());
		System.out.println("c.hashCode():" + p2.hashCode());
		System.out.println("d.hashCode():" + p3.hashCode());

		int[] arr = { a, b, c, d };
		for (int i = 0; i < arr.length - 1; i++) {
			for (int j = 0; j < arr.length - 1 - i; j++) {
				if (arr[j] > arr[j + 1]) {
					int temp = arr[j];
					arr[j] = arr[j + 1];
					arr[j + 1] = temp;
				}
			}
		}
		System.out.println(Arrays.toString(arr));

		List<Person> list = new ArrayList<Person>();
		list.add(p0);
		list.add(p1);
		list.add(p2);
		list.add(p3);

		for (Person p : list) {
			System.out.println(p.toString());
		}

		System.out.println("---------------------");

		Set<Person> set = new HashSet<Person>();
		set.add(p0);
		set.add(p1);
		set.add(p2);
		set.add(p3);

		Iterator<Person> it = set.iterator();
		while (it.hasNext()) {
			System.out.println(it.next().toString());
		}
	}
}

-------------
a.hashCode():366712642
b.hashCode():1829164700
c.hashCode():2018699554
d.hashCode():1311053135
[366712642, 1311053135, 1829164700, 2018699554]
Person [name=a, age=1]
Person [name=b, age=1]
Person [name=c, age=1]
Person [name=d, age=1]
---------------------
Person [name=c, age=1]
Person [name=a, age=1]
Person [name=b, age=1]
Person [name=d, age=1]

给hashCode排序，发现set的取出也不遵循hashCode的大小顺序

标签：arr,顺序,list,hashCode,Person,add,set,遵循,放入
来源： https://blog.csdn.net/pb951028/article/details/94880852