Java中setLayout(null)导致组件不显示

唐加彬 2017-10-13 04:21:41

错误如题，直接贴代码。





package com.zwtj.tang.view;



import javax.swing.*;

import java.awt.*;

import java.text.DateFormat;



public class TimerFrame extends JFrame{





    private JLabel sys_h;

    private JLabel sys_min;

    private JLabel sys_s;





    public TimerFrame( ){

        super();

        setTitle("时钟定时器");

        setBounds(100,100,640,480);

        setLayout(null);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Container content = getContentPane();

        setVisible(true);



        //左上面板

        JPanel leftPl = new JPanel();

        leftPl.setLayout(null);

        leftPl.setBounds(10,10,297,180);

        leftPl.setBackground(Color.black);

        content.add(leftPl);



        //右上面板

        JPanel rightPl = new JPanel();

        rightPl.setLayout(null);

        rightPl.setBounds(317,10,297,180);

        rightPl.setBackground(Color.black);

        content.add(rightPl);



        //底部面板

        JPanel bottomPanel = new JPanel();

        bottomPanel.setLayout(null);

        bottomPanel.setBounds(10,200,605,230);

        bottomPanel.setBackground(Color.GRAY);

        bottomPanel.setPreferredSize(new Dimension(605,230));

        bottomPanel.setSize(605,230);

        content.add(bottomPanel);



        //左侧容器名称标签

        JLabel sys_time = new JLabel();

        sys_time.setText("当前系统时间：");

        sys_time.setBounds(5,5,200,30);

        sys_time.setFont(new Font("宋体",Font.BOLD,12));

        sys_time.setForeground(Color.white);

        leftPl.add(sys_time);



        //系统_时分秒

        sys_h = new JLabel();

        sys_h.setText("00");

        sys_h.setBounds(50,60,370,50);

        sys_h.setFont(new Font("Digiface",Font.BOLD,42));

        sys_h.setForeground(Color.red);

        leftPl.add(sys_h);



        //系统_冒号

        JLabel colon_1 = new JLabel();

        colon_1.setText(":");

        colon_1.setBounds(100,55,30,50);

        colon_1.setFont(new Font("Digiface",Font.BOLD,42));

        colon_1.setForeground(Color.red);

        leftPl.add(colon_1);



        //系统_分

        sys_min = new JLabel();

        sys_min.setText("00");

        sys_min.setBounds(120,60,70,50);

        sys_min.setFont(new Font("Digiface",Font.BOLD,42));

        sys_min.setForeground(Color.red);

        leftPl.add(sys_min);



        //系统_冒号

        JLabel colon_2 = new JLabel();

        colon_2.setText(":");

        colon_2.setBounds(170,55,30,50);

        colon_2.setFont(new Font("Digiface",Font.BOLD,42));

        colon_2.setForeground(Color.red);

        leftPl.add(colon_2);



        //系统_秒

        sys_s = new JLabel();

        sys_s.setText("00");

        sys_s.setBounds(190,60,70,50);

        sys_s.setFont(new Font("Digiface",Font.BOLD,42));

        sys_s.setForeground(Color.red);

        leftPl.add(sys_s);



        //右侧容器名称标签

        JLabel timer_time = new JLabel();

        timer_time.setText("倒计时时间：");

        timer_time.setBounds(5,5,200,30);

        timer_time.setFont(new Font("宋体",Font.BOLD,12));

        timer_time.setForeground(Color.white);

        rightPl.add(timer_time);



        //倒计时_时

        JLabel timer_h = new JLabel();

        timer_h.setText("00");

        timer_h.setBounds(60,60,70,50);

        timer_h.setFont(new Font("Digiface",Font.BOLD,42));

        timer_h.setForeground(Color.red);

        rightPl.add(timer_h);



        //倒计时_冒号

        JLabel colon_3 = new JLabel();

        colon_3.setText(":");

        colon_3.setBounds(110,55,30,50);

        colon_3.setFont(new Font("Digiface",Font.BOLD,42));

        colon_3.setForeground(Color.red);

        rightPl.add(colon_3);



        //倒计时_分

        JLabel timer_min = new JLabel();

        timer_min.setText("00");

        timer_min.setBounds(130,60,70,50);

        timer_min.setFont(new Font("Digiface",Font.BOLD,42));

        timer_min.setForeground(Color.red);

        rightPl.add(timer_min);



        //倒计时_冒号

        JLabel colon_4 = new JLabel();

        colon_4.setText(":");

        colon_4.setBounds(180,55,30,50);

        colon_4.setFont(new Font("Digiface",Font.BOLD,42));

        colon_4.setForeground(Color.red);

        rightPl.add(colon_4);



        //倒计时_秒

        JLabel timer_s = new JLabel();

        timer_s.setText("00");

        timer_s.setBounds(200,60,70,50);

        timer_s.setFont(new Font("Digiface",Font.BOLD,42));

        timer_s.setForeground(Color.red);

        rightPl.add(timer_s);



        //倒计时输入框_时

        JTextField text_h = new JTextField();

        text_h.setBounds(50,50,50,30);

        bottomPanel.add(text_h);



        //倒计时_时

        JLabel colon_5 = new JLabel();

        colon_5.setText("时");

        colon_5.setBounds(110,40,30,50);

        colon_5.setFont(new Font("黑体",Font.BOLD,24));

        colon_5.setPreferredSize(new Dimension(30,50));

        colon_5.setSize(30,50);

        bottomPanel.add(colon_5);

    }







    public JLabel getSys_h() {

        return sys_h;

    }



    public void setSys_h(JLabel sys_h) {

        this.sys_h = sys_h;

    }



    public JLabel getSys_min() {

        return sys_min;

    }



    public void setSys_min(JLabel sys_min) {

        this.sys_min = sys_min;

    }



    public JLabel getSys_s() {

        return sys_s;

    }



    public void setSys_s(JLabel sys_s) {

        this.sys_s = sys_s;

    }



}