我有一个employee2 java文件,我创建了3个对象,我正在尝试使用 System.identityhashCode(Object o)计算这些对象的hashcode(),但它总是给出所有对象的值相同,可能如何
注 - >我没有实现hashcode()或equals,我只是使用hashcode()的默认实现
代码如下:
public class employee2
{
private int empid;
private String name;
private String dept;
employee2(){
}
public employee2(int empid,String name,String dept){
this.empid=empid;
this.name=name;
this.dept=dept;
}
public static void main(String args[]){
employee2 e1=new employee2(9846,"Amol Sngh","Science");
employee2 e2=new employee2(9844,"Amol Singh","Scienc");
employee2 e3=new employee2(98446,"Amol Singh","Science");
employee2 e4=new employee2(96,"Amol Sh","Sciece");
System.out.println(System.identityHashCode(e1)+" "+System.identityHashCode(e2)+" "+System.identityHashCode(e3)+" "+System.identityHashCode(e4));
}
}
它始终为每个对象提供值 366712642
答案 0 :(得分:-2)
这就是我所期待的。它总是会为您提供父对象的hashCode,而不是单个实例:
http://www.javaworld.com/article/2073618/java-s-system-identityhashcode.html