//类A的equals方法总是返回true,但没有重写其hashCode()方法
class A
{
public boolean equals(Object obj)
{
return true;
}
}
//类B的hashCode()方法总是返回1,但没有重写其equals()方法
class B
{
public int hashCode()
{
return 1;
}
}
//类C的hashCode()方法总是返回2,但没有重写其equals()方法
class C
{
public int hashCode()
{
return 2;
}
public boolean equals(Object obj)
{
return true;
}
}
public class HashCode
{
public static void main(String[] args)
{
HashSet books = new HashSet();
//分别向books集合中添加2个A对象，2个B对象，2个C对象
books.add(new A());
books.add(new A());
books.add(new B());
books.add(new B());
books.add(new C());
books.add(new C());
System.out.println(books);
}
}[/code]结果为[code=java][cn.itcast.zhanjc.B@1, cn.itcast.zhanjc.B@1, cn.itcast.zhanjc.C@2, cn.itcast.zhanjc.A@1fb8ee3, cn.itcast.zhanjc.A@c17164][/code]