Collection中移除失败问题

[亚林瓜子]

我建立一个Name类，Name类已经重写了equals方法。在测试(BasicContainer类)中把Name放入Collection中然后调用remove方法进行移除，但移除失败
Name类：

package day07;

public class Name implements Comparable {
	private String firstName;
	private String lastName;
	public String getFirstName() {
		return firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public Name(String firstName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}
	/*public int hastCode(){
		return this.getFirstName().hashCode();
	}*/
	@Override
	/**
	 * 重写的equals方法在这里
	 */
	public boolean equals(Object obj){
		if(obj instanceof Name){
			Name name = (Name) obj;
			return (this.getFirstName().equals(name.getFirstName()) 
						&& this.getLastName().equals(name.getLastName()));
		}
		return false;
	}
	@Override
	public String toString() {
		return firstName + "" + lastName;
	}
	@Override
	public int compareTo(Object o) {
		Name n = (Name)o;
		int lastCmp = lastName.compareTo(n.lastName);
		return (lastCmp != 0 ? lastCmp: firstName.compareTo(n.firstName));
	}

}

BasicContainerf类：

package day07;

import java.util.Collection;
import java.util.HashSet;

public class BasicContainer {

	/**
	 *equals比较内容
	 * @param args
	 */
	public static void main(String[] args) {
		Collection c = new HashSet();
		c.add("hello");
		c.add("abc");
		c.add(new Name("f1", "L1"));
		c.add(new Integer(100));
		c.remove("hello");
		c.remove(new Integer(100));
		System.out.println(new Name("f1","L1").equals((new Name("f1", "L1"))));//但这里为true
		System.out.println(c.remove(new Name("f1", "L1")));//移除不掉，这里为false
		System.out.println(c);//c中仍有f1L1
	}

}

[awusoft]

 final Entry<K,V> removeEntryForKey(Object key) {
        int hash = (key == null) ? 0 : hash(key.hashCode());
        int i = indexFor(hash, table.length);
        Entry<K,V> prev = table[i];
        Entry<K,V> e = prev;

        while (e != null) {
            Entry<K,V> next = e.next;
            Object k;
            if (e.hash == hash &&
                ((k = e.key) == key || (key != null && key.equals(k)))) {
                modCount++;
                size--;
                if (prev == e)
                    table[i] = next;
                else
                    prev.next = next;
                e.recordRemoval(this);
                return e;
            }
            prev = e;
            e = next;
        }

        return e;
    }

HashSet的remove方法

[awusoft]

先判断hashCode的,先把hashCode方法写上吧,你的代码是
public int hastCode()
应该是
public int hashCode()

[wang7535067]

[Quote=引用 2 楼 awusoft 的回复:]
先判断hashCode的,先把hashCode方法写上吧,你的代码是
public int hastCode()
应该是
public int hashCode()
[/Quote]
正解

[亚林瓜子]

[Quote=引用 2 楼 awusoft 的回复:]

先判断hashCode的,先把hashCode方法写上吧,你的代码是
public int hastCode()
应该是
public int hashCode()
[/Quote]
我将Name类中的hashCode方法重写，得到的结果还是一样的，仍然没有移除，上面一个打印true，下面一个打印false
Name类：

package day07;

public class Name implements Comparable {
	private String firstName;
	private String lastName;
	public String getFirstName() {
		return firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public Name(String firstName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}
	public int hastCode(){
		return this.getFirstName().hashCode();
	}
	@Override
	/**
	 * 重写的equals方法在这里
	 */
	public boolean equals(Object obj){
		if(obj instanceof Name){
			Name name = (Name) obj;
			return (this.getFirstName().equals(name.getFirstName()) 
						&& this.getLastName().equals(name.getLastName()));
		}
		return false;
	}
	@Override
	public String toString() {
		return firstName + "" + lastName;
	}
	@Override
	public int compareTo(Object o) {
		Name n = (Name)o;
		int lastCmp = lastName.compareTo(n.lastName);
		return (lastCmp != 0 ? lastCmp: firstName.compareTo(n.firstName));
	}

}

[huntor]

hashCode 错成 hastCode了 。

[亚林瓜子]

[Quote=引用 5 楼 huntor 的回复:]

hashCode 错成 hastCode了 。
[/Quote]
改掉之后，运行正常，两句打印均为true；
改进之前，这两句一个打印true，一个打印false，为什么效果不相同？

 System.out.println(new Name("f1","L1").equals((new Name("f1", "L1"))));//但这里为true
 System.out.println(c.remove(new Name("f1", "L1")));//移除不掉，这里为false

[awusoft]

[Quote=引用 2 楼 awusoft 的回复:]
先判断hashCode的,先把hashCode方法写上吧,你的代码是
public int hastCode()
应该是
public int hashCode()
[/Quote]

我不是告诉你这里的方法名不对了吗?
你方法名不一样,就相当于没有重写hashCode方法啊.调用的是Object的hashCode方法.