java - 正确的 JFrame 组件，用于查看输入的数据，并在加载时正确查看布局

Question

截至目前，我的所有标签和输入字段都堆叠在 JFrame 的中心。

当我运行该程序时，“公司名称”标 checkout 现在顶部中心，在我调整窗口大小时之前什么都没有出现...

谁能告诉我为什么会这样以及如何解决它？

我还想在 JFrame 的左侧添加一个区域，当您单击“保存”时将显示联系人，我将使用哪种类型的组件来执行此操作？

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.*;
import javax.swing.*;

public class Driver extends JFrame {
    private JFrame f;
    private JPanel p;
    private JTextField fieldBN;
    private JTextField fieldFN;
    private JTextField fieldLN;
    private JTextField fieldP;
    private JTextField fieldE;
    private JTextField fieldA;
    private JTextField aLine2;
    private JTextField fieldW;
    private JLabel labelBN;
    private JLabel labelFN;
    private JLabel labelLN;
    private JLabel labelP;
    private JLabel labelE;
    private JLabel labelA;
    private JLabel labelW;
    private JButton buttonS;

    // Constructor:
    public Driver() {       
        gui();      
    }

    public void gui() {
        f = new JFrame("Contact Book");
        f.setVisible(true);
        f.setSize(900,800); // default size is 0,0
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        GridBagConstraints c = new GridBagConstraints();  

        c.insets = new Insets(10, 10, 10, 10);

        p = new JPanel(new GridBagLayout());
        f.getContentPane().add(p, BorderLayout.NORTH);

    c.gridx = 100;
    c.gridy = 0;
    labelBN = new JLabel ("Business Name");
    p.add(labelBN, c);  

    c.gridx = 110;
    c.gridy = 0;
    fieldBN = new JTextField(10);
    p.add(fieldBN, c);

    c.gridx = 100;
    c.gridy = 10;
    labelFN= new JLabel ("First Name");
    p.add(labelFN, c);      

    c.gridx = 110;
    c.gridy = 10;
    fieldFN = new JTextField (10);
    p.add(fieldFN, c);

    c.gridx = 100;
    c.gridy = 20;
    labelLN= new JLabel ("Last Name");
    p.add(labelLN, c);      

    c.gridx = 110;
    c.gridy = 20;
    fieldLN = new JTextField (10);
    p.add(fieldLN, c);

    c.gridx = 100;
    c.gridy = 30;
    labelP = new JLabel ("Phone Number");
    p.add(labelP, c);

    c.gridx = 110;
    c.gridy = 30;
    fieldP = new JTextField (10);
    p.add(fieldP, c);

    c.gridx = 100;
    c.gridy = 40;
    labelE = new JLabel ("Email");
    p.add(labelE, c);

    c.gridx = 110;
    c.gridy = 40;
    fieldE = new JTextField (10);
    p.add(fieldE, c);

    c.gridx = 100;
    c.gridy = 50;                           
    labelA = new JLabel ("Address");
    p.add(labelA, c);

    c.gridx = 110;
    c.gridy = 50;
    fieldA = new JTextField (10);
    p.add(fieldA, c);
    c.gridx = 110;
    c.gridy = 60;
    aLine2 = new JTextField (10);
    p.add(aLine2, c);

    c.gridx = 100;
    c.gridy = 70;
    labelW = new JLabel ("Website");
    p.add(labelW, c);

    c.gridx = 110;
    c.gridy = 70;
    fieldW = new JTextField (10);
    p.add(fieldW, c);

    c.gridx = 110;
    c.gridy = 80;
    buttonS = new JButton("Save");
    p.add(buttonS, c);

      //    Window Listeners
      addWindowListener(new WindowAdapter() {

      }
        ); 
           } // End Gui

      public static void main(String[] args) {

          new Driver();
       } // End main Method

       } // End class Driver

Answer 1

可能的原因就在这里...

public void gui() {
    f = new JFrame("Contact Book");
    f.setVisible(true);
    f.setSize(900,800); // default size is 0,0

您正在提前调用 setVisible。

简单的解决方案是在按照您想要的方式设置框架后调用 setVisible...

public void gui() {
    f = new JFrame("Contact Book");
    // Add everything to the frame...
    // pack the frame for better cross platform support
    f.pack();
    // Make it visible
    f.setVisible(true);
}

此外，从 JFrame 扩展然后创建 JFrame 的实例非常令人困惑。通常，您不需要从 JFrame 进行扩展，只需根据需要继续创建实例即可。

您还应该看看 Initial Threads

例如……

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
       public void run() {
            new Driver();
       }
    });
} // End main Method