HashSet的测试

最新推荐文章于 2025-11-30 18:24:05 发布

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//HashSet的测试
import java.util.*;
public class HashSetTest
{
public static void main(String[] args)
{
  HashSet ha = new HashSet();
  StudentTwo st1=new StudentTwo("zhangsan",18);
  StudentTwo st2=new StudentTwo("lisi",17);
  StudentTwo st3=new StudentTwo("wangwu",19);
  StudentTwo st4=new StudentTwo("zhangsan",18);
  /*ha.add("one");
  ha.add("two");
  ha.add("three");
  ha.add("one");*/

  ha.add(st1);
  ha.add(st2);
  ha.add(st3);
  ha.add(st4);

  Iterator i = ha.iterator();
  while(i.hasNext())
  {
   System.out.println(i.next());
  }
}
}
class StudentTwo
{
int num;
String name;
StudentTwo(String name,int num)
{
  this.num=num;
  this.name=name;
}
public String toString()
{
  return num+":"+name;
}
public int hashCode()
{
  return num*name.hashCode();
}
public boolean equals(Object obj)
{
  StudentTwo s=(StudentTwo)obj;
  return (num==s.num)&(name.equals(s.name));
}
}