Map接口练习题-CFANZ编程社区

题目：使用 HashMap 添加 3 个员工对象，要求键：员工 id 值：员工对并遍历显示工资 > 18000 的员工（遍历方式最少两种）员工类：姓名、工资、员工 id

 public static void main(String[] args) {

        Map map = new HashMap();
        map.put(1,new Worker("tom",20000,10010));
        map.put(2,new Worker("jason",19000,10011));
        map.put(3,new Worker("mike",17000,10012));

        //1.遍历
        Set set = map.keySet();
        for (Object key : set) {
            Worker worker = (Worker) map.get(key);
            if(worker.getSal() > 18000)
            System.out.println(key + ":" + map.get(key));
            //1:tom 20000 10010  2:jason 19000  10011
        }


        System.out.println("===================================");

        //2.遍历
        Set entrySet = map.entrySet();
        for (Object entry : entrySet) {
           Map.Entry m = (Map.Entry) entry;
            Worker worker = (Worker) m.getValue();
            if(worker.getSal() > 18000)
                System.out.println(m.getKey() + ":" + m.getValue());
                //1:tom 20000 10010  2:jason 19000  10011
        }
    }

}

class Worker{
    private String name;
    private double sal;
    private int id;

    public Worker(String name, double sal, int id) {
        this.name = name;
        this.sal = sal;
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getSal() {
        return sal;
    }

    public void setSal(double sal) {
        this.sal = sal;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public String toString() {
        return name + "\t" + sal  + "\t" + id ;

    }
}