hashmaphashmap的嵌套并循环

最新推荐文章于 2025-06-22 13:11:29 发布

fenuang

最新推荐文章于 2025-06-22 13:11:29 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/qq_34533413/article/details/52388488

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本文展示了一个使用Java实现的HashMap嵌套实例，通过两个不同的员工分组（龙套组和大神组）来组织员工信息，并展示了如何遍历这些嵌套的Map。

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package com.heima.test;

import java.util.HashMap;

import com.heima.Student.Student;

public class hashmaphashmap {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		// 公司龙套组
		HashMap<Student, String> hm1 = new HashMap<>();
		hm1.put(new Student("张三", 23), "北京");
		hm1.put(new Student("李四", 24), "上海");
		hm1.put(new Student("王五", 25), "深圳");
		hm1.put(new Student("赵六", 26), "广州");
		hm1.put(new Student("吴七", 27), "苏州");

		// 公司大神组
		HashMap<Student, String> hm2 = new HashMap<>();
		hm2.put(new Student("黄粲迪", 18), "北京");
		hm2.put(new Student("冯光", 24), "上海");
		hm2.put(new Student("猪婆", 25), "深圳");
		hm2.put(new Student("大臭脚", 26), "广州");
		hm2.put(new Student("死猪", 27), "苏州");

		// 定义公司盈利组(包括龙套和大神)
		HashMap<HashMap<Student, String>, String> hm = new HashMap<>();
		hm.put(hm1, "公司龙套组");
		hm.put(hm2, "公司大神组");

		// 遍历mapmap
		for (HashMap<Student, String> c : hm.keySet()) { // hm.keySet()代表键中的集合
			String vaule = hm.get(c); // 根据键对象获取值对象
			// System.out.println(vaule);
			for (Student s : c.keySet()) { // c.keySet()代表集合中所有学生键对象
				String vaule1 = c.get(s); // 根据键对象获取值对象
				System.out.println(s + "=" + vaule1 + "=" + vaule);
			}

		}
	}

}

这是student类

package com.heima.Student;

public class Student {

	private String name;
	private int age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	/**
	 * @param name
	 * @param age
	 */
	public Student(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	/**
	 * 
	 */
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		// return "Person : [name=" + name + ", age = " + age + "]";
		return "Person : [name = " + name + ", age = " + age + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + age;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Student other = (Student) obj;
		if (age != other.age)
			return false;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		return true;
	}

}