小编Sum*_*gal的帖子

public class Test
{
    public static void main(String[] args) {
        Employee e1=new Employee(1);
        Employee e2=new Employee(1);
        HashMap<Employee,String> map=new HashMap<Employee,String>();
        map.put(e1, "A");
        map.put(e1, "B");
        map.put(e2, "C");
        }
}
class Employee{
    private int id;
     Employee(int id){
         this.id=id;
     }

@Override
public int hashCode() {
    System.out.println("hascode is ="+this.id);
    return  this.id;
}
@Override
    public boolean equals(Object obj) {
    System.out.println("Equals");
        return super.equals(obj);
    }
}

当我再次放置相同的对象e1时,不会调用equals()方法,那么如何在没有在地图的现有对象中检查的情况下为键e1替换值B？(我认为这是equals方法的工作)