自定义对象 不做任何重写 
hashCode() 如何计算
equals() 是如何比较的
==比较的是什么


直接上代码

public class MyObject  {
	public static void main(String[] args) throws Exception {
		MyObject obj1 = new MyObject();		
		System.out.println(obj1.hashCode()+","+System.identityHashCode(obj1)+","+obj1+","+Integer.toHexString(obj1.hashCode()));		
		MyObject obj2 = new MyObject();	
		MyObject obj3 = obj1;
		
		System.out.println(obj3.hashCode()+","+System.identityHashCode(obj3)+","+obj3+","+Integer.toHexString(obj3.hashCode()));

		System.out.println(obj1.equals(null));	
		System.out.println(obj1.equals(obj3));
		System.out.println(obj1.equals(obj2));			
	}	
}


输出结果

2018699554,2018699554,dyyx.my.MyObject@7852e922,7852e922
2018699554,2018699554,dyyx.my.MyObject@7852e922,7852e922
false
true
false


public boolean equals(Object obj) {
        return (this == obj);
}