java - 向 jframe 添加更多容器

Question

我怎样才能将更多容器添加到我的 Jframe 中？这是我的代码行，我想在一个窗口中制作一个时钟，该窗口包含同一 jframe 一侧的其他时钟，这是我的代码:

 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;
 import java.util.Calendar;  
 public class CopyOftheclock {
public static void main(String[] args) {
    JFrame clock = new TextClockWindow();
    clock.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    clock.setVisible(true);
     }
}


 @SuppressWarnings("serial")
 class TextClockWindow extends JFrame {
 private JTextField timeField;
   public TextClockWindow() {
    timeField = new JTextField(7);
    timeField.setFont(new Font("sansserif", Font.PLAIN, 48));

    Container content = this.getContentPane();
    content.setLayout(new FlowLayout());
    content.add(timeField); 

    this.setTitle("Norway");
    this.pack();
    javax.swing.Timer t = new javax.swing.Timer(1000,
          new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                  String a = "";
                  Calendar now = Calendar.getInstance();
                  int h = now.get(Calendar.HOUR_OF_DAY);
                    if (h==24)
                    {
                        h=8;
                        a = "A.M";
                    }
                    if (h==1)
                    {
                        h=9;
                        a = "A.M";
                    }
                    if (h==2)
                    {
                        h=10;
                        a = "A.M";
                    }
                    if (h==3)
                    {
                        h=11;
                        a = "A.M";
                    }
                    if (h==4)
                    {
                        h=12;
                        a = "P.M";
                    }
                    if (h==5)
                    {
                        h=1;
                        a = "P.M";
                    }
                    if (h==6)
                    {
                        h=2;
                        a = "P.M";
                    }
                    if (h==7)
                    {
                        h=3;
                        a = "P.M";
                    }
                    if (h==8)
                    {
                        h=4;
                        a = "P.M";
                    }
                    if (h==9)
                    {
                        h=5;
                        a = "P.M";
                    }
                    if (h==10)
                    {
                        h=6;
                        a = "P.M";
                    }
                    if (h==11)
                    {
                        h=7;
                        a = "P.M";
                    }
                    if (h==12)
                    {
                        h=8;
                        a = "P.M";
                    }
                    if (h==13)
                    {
                        h=9;
                        a = "P.M";
                    }
                    if (h==14)
                    {
                        h=10;
                        a = "P.M";
                    }
                    if (h==15)
                    {
                        h=11;
                        a = "P.M";
                    }
                    if (h==16)
                    {
                        h=12;
                        a = "P.M";
                    }
                    if (h==17)
                    {
                        h=1;
                        a = "A.M";
                    }
                    if (h==18)
                    {
                        h=2;
                        a = "A.M";
                    }
                    if (h==19)
                    {
                        h=3;
                        a = "A.M";
                    }
                    if (h==20)
                    {
                        h=4;
                        a = "A.M";
                    }
                    if (h==21)
                    {
                        h=5;
                        a = "A.M";
                    }
                    if (h==22)
                    {
                        h=6;
                        a = "A.M";
                    }
                    if (h==23)
                    {
                        h=7;
                        a = "A.M";
                    }
                  int m = now.get(Calendar.MINUTE);
                  int s = now.get(Calendar.SECOND);
                  timeField.setText("" + h + ":" + m + ":" + s + " " + a);
              }

          });
    t.start();
     }
 }

如果你们能帮我实现这个功能，我将不胜感激!

Answer 1

1) 显示不可编辑的文本使用JLabel而不是 JTextField .

2) 代码少，使用SimpleDateFormat的方法.

3) 使用正确的 LayoutManager ;在你的情况下(也许)GridLayout将使所有 JComponent 在屏幕上具有相同的 Dimension。

4) main public static void main(String[] args) { 中的所有 GUI 相关代码都应该包装到 invokeLater() 中；更多信息 Initial Threads .

5) 也许剩下的this thread could be useful .