JAVA的HashSet的使用

public class TestSet {

 public static void main(String[] args) {
  Set set = new HashSet();
  Teacher t1 = new Teacher("haitao",50);
  Teacher t2 = new Teacher("xubin",1000);
  Teacher t3 = new Teacher("wangwei",80000);
  Teacher t4 = new Teacher("haitao",50);
  set.add(t1);
  set.add(t2);
  set.add(t3);
  set.add(t4);
        Set treeset = new TreeSet(set);
  treeset.addAll(set);
  
//  t4.setName("hai"); 导致内存泄露
//  set.remove(t4);
  
  Iterator it = set.iterator();
  while(it.hasNext()){
   System.out.println(it.next());
  }
 }
}

 

 

public class Teacher implements Comparable{//Comparable接口用于排序
    private String name;
    private int salary;

    public Teacher(String name, int salary) {
        this.name = name;
        this.salary = salary;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getSalary() {
        return salary;
    }
    public void setSalary(int salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        return this.name+":"+this.salary;
    }

    public int compareTo(Object o) {
        
        if(o instanceof Teacher){
            Teacher teacher = (Teacher)o;
            //return this.getSalary()-teacher.getSalary();
            return this.getName().compareTo(teacher.getName());
        }
        return 0;
    }

    @Override
    public boolean equals(Object obj) {
        //System.out.println("in equals...");
        if(this == obj){
            return true;
        }
        if(obj == null){
            return false;
        }
        if(obj instanceof Teacher){
            Teacher t1 = (Teacher) obj;
            return t1.getName().equals(this.getName());
        }
        return false;
    }

    
    public int hashCode() {
        //System.out.println("in hashCode...");
        return name.hashCode();
    }
    
}