[英]No Components are showing up on JFrame GUI
我對Swing和GUI還是相當陌生,到目前為止,僅會顯示該窗口,但是所有組件都不可見。 我該怎么辦? 可見性是否有問題或容器是否有問題?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PhoneCaller
{
JButton button1;
JButton button2;
JButton button3;
JButton button4;
JButton button5;
JButton button6;
JButton button7;
JButton button8;
JButton button9;
JButton buttonDash;
JButton button0;
JButton dialButton;
String phoneNum = "";
public static void main (String[] args)
{
new PhoneCaller();
}
public PhoneCaller()
{
JFrame myFrame = new JFrame();
myFrame.setTitle("Dialer");
myFrame.setSize(200, 250);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel myPanel = new JPanel(new BorderLayout(10,10));
myPanel.setLayout(new BoxLayout(myPanel, BoxLayout.Y_AXIS));
myFrame.add(myPanel);
JPanel myPanel2 = new JPanel();
myPanel2.setLayout(new FlowLayout());
JLabel lab = new JLabel("Enter the number to dial");
myPanel2.add(lab);
JPanel myPanel3 = new JPanel();
myPanel3.setLayout(new GridLayout(4,3,5,5));
button1 = new JButton ("1");
myPanel3.add(button1);
button2 = new JButton ("2");
myPanel3.add(button2);
button3 = new JButton ("3");
myPanel3.add(button3);
button4 = new JButton ("4");
button5 = new JButton ("5");
button6 = new JButton ("6");
button7 = new JButton ("7");
button8 = new JButton ("8");
button9 = new JButton ("9");
button0 = new JButton ("0");
buttonDash = new JButton ("-");
myPanel3.add(button4);
myPanel3.add(button5);
myPanel3.add(button6);
myPanel3.add(button7);
myPanel3.add(button8);
myPanel3.add(button9);
myPanel3.add(button0);
myPanel3.add(buttonDash);
myFrame.setVisible(true);
}
}
我想你忘了添加myPanel2
和myPanel3
內myPanel
。
myPanel.add(myPanel2);
myPanel.add(myPanel3);
您忘記將myPanel2
和myPanel3
添加到JFrame,將以下代碼段添加到代碼末尾
myFrame.add(myPanel2);
myFrame.add(myPanel3);
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