public static void main(String[] args){
        Set aset = new TreeSet();
        VO avo1 = new VO(1);
        VO avo2 = new VO(3);
        
        if(avo1.equals(avo2)){
            System.out.println("equals:" + true);
        }
        
        if(avo1.hashCode() == avo2.hashCode()){
            System.out.println("hashcode:" + true);
        }

        aset.add(avo1);
        aset.add(avo2);
        
        Iterator it = aset.iterator();
        while(it.hasNext()){
            VO show = (VO)it.next();
            System.out.println(show.toString());
        }
    }

public class VO implements Comparable{
    private int name;
    
    
    public VO(int name){
        this.name = name;
    }

    @Override
    public boolean equals(Object obj) {
        VO vo = (VO)obj;//比较余数
        if(this.hashCode() - vo.hashCode()==0){
            return true;
        }
        return false;
    }

    @Override
    public int hashCode() {
        // TODO Auto-generated method stub
        return name%2;//取余数
    }

    @Override
    public int compareTo(Object obj) {
        
        return this.name - ((VO)obj).name;
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return "name:" + name;
    }
    
    
}