請高手幫我看看toArray的用法其返回的是哈希碼是不是需要重寫importjava.util.*;publicclassTest1{publicstaticvoidmain(String[]args){Namen1=newName("f1","l1");Namen2=newName("f...

請高手幫我看看toArray的用法 其返回的是哈希碼 是不是需要重寫

import java.util.*;

public class Test1{

public static void main(String[] args){

Name n1 = new Name("f1","l1");

Name n2 = new Name("f2","l2");

Collection c1 = new ArrayList();

c1.add(n1);

c1.add(n2);

c1.add("hello");

c1.add("world");

c1.add(new Integer(100));

int a = c1.size();

System.out.println(a);

System.out.println(c1.contains(n1));

System.out.println(c1);

System.out.println(c1);

Object[] x=c1.toArray(new Object[0]);

for(int i=0;i

System.out.println(c1.toArray());

}

Iterator y = c1.iterator();

while(y.hasNext()){

//Name n = (Name)y.next();

System.out.print(y.next()+" ");

}

}

}

class Name{

String firstname,lastname;

Name(String f1,String f2){

this.firstname = f1;

this.lastname = f2;

}

public String getFirstname(){

return firstname;

}

public String getLastname(){

return lastname;

}

public String toString(){

return firstname+" "+lastname;

}

public boolean equals(Object o){

if(o instanceof Name){

Name name = (Name)o;

return (firstname.equals(name.firstname))

&&(lastname.equals(name.lastname));

}

return super.equals(o);

}

public int hashCode(){

return firstname.hashCode();

}

}

其運(yùn)行結(jié)果是這樣的

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