myobject.java

来自「java 教程相应的代码 全是自己写的内附注释 很容易看明白的」· Java 代码 · 共 70 行

package demo.chapter.collection;

import java.util.HashSet;
import java.util.Set;

public class MyObject {
	
	private String name;
	
	public MyObject(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	@Override
	public String toString() {
		return name;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		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;
		MyObject other = (MyObject) obj;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		return true;
	}

	public static void main(String[] args) {
		Set<MyObject> set = new HashSet<MyObject>();
		MyObject obj1 = new MyObject("Tom");
		MyObject obj2 = new MyObject("Frank");
		MyObject obj3 = new MyObject("Tom");
		MyObject obj4 = obj2;
		MyObject obj5 = new MyObject(null);
		MyObject obj6 = new MyObject(null);
		set.add(obj1);
		set.add(obj2);
		set.add(obj3);
		set.add(obj4);
		set.add(obj5);
		set.add(obj6);
		System.out.println(set);
	}

}