import java.util.*;
public class MyKey
{
private int age;
private String name;
public MyKey(String name , int age )
{
this.name =name;
this.age = age;
}
public String toString ()
{
return new String (name+" ,"+age);
}
public boolean equals(Object obj)
{
if (name.equals(obj.name)&& age==obj.age)
return true;
else
return false;
}
public int hashCode()
{
return name.hashCode()+age;
}
public static void main(String[] args)
{
Hashtable numbers = new Hashtable(); numbers.put(new MyKey("zhangshan",18),new Integer(1));
numbers.put(new MyKey("lisi",12),new Integer(2));
numbers.put(new MyKey("wangwi",14),new Integer(2)); Enumeration e = numbers.keys();
while (e.hasMoreElements())
{
MyKey key = (MyKey)e.nextElement(); System.out.print(key.toString()+"="); System.out.println(numbers.get(key).toString());
} }
}
这个程序运行时为什么回找不到 name age 变量呢..
请高手指教...
public class MyKey
{
private int age;
private String name;
public MyKey(String name , int age )
{
this.name =name;
this.age = age;
}
public String toString ()
{
return new String (name+" ,"+age);
}
public boolean equals(Object obj)
{
if (name.equals(obj.name)&& age==obj.age)
return true;
else
return false;
}
public int hashCode()
{
return name.hashCode()+age;
}
public static void main(String[] args)
{
Hashtable numbers = new Hashtable(); numbers.put(new MyKey("zhangshan",18),new Integer(1));
numbers.put(new MyKey("lisi",12),new Integer(2));
numbers.put(new MyKey("wangwi",14),new Integer(2)); Enumeration e = numbers.keys();
while (e.hasMoreElements())
{
MyKey key = (MyKey)e.nextElement(); System.out.print(key.toString()+"="); System.out.println(numbers.get(key).toString());
} }
}
这个程序运行时为什么回找不到 name age 变量呢..
请高手指教...
if (!(obj instanceof MyKey)) {
return false ;
}
MyKey mk = (MyKey) obj;
if (name.equals(mk.name) && age == mk.age) return true; else
return false;
}