Java------遍历Map<k,v>的方法

1.

public class MapAction extends ActionSupport{
    private Map<String, User> map = new HashMap<>();
 
    public Map<String, User> getMap() {
        return map;
    }
 
    public void setMap(Map<String, User> map) {
        this.map = map;
    }
 
    @Override
    public String execute() throws Exception {
        //方法一：通过Entry遍历<迭代Entry>
        for(Entry<String, User> entry : map.entrySet()) {
            System.out.println(entry.getKey()+"："+entry.getValue().getUsername());
        }
        //方法二：通过Set集合遍历<迭代Set>
        for(String key: map.keySet()){
            System.out.println(key + "：" + map.get(key).getPassword());
        }
 
        return SUCCESS;
    }
 
}