java递归获取某个父节点下面的所有子节点

1.menu实体类

package recursion;

/**
 * Created by tl on 2016/4/10.
 */
public class Menu {
    private String id;
    private String name;
    private String pid;

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }
}package recursion;

/**
 * Creat