使JPanel更大

Question

我想让我的JPanel更大。我有三个选项卡，但是当我运行程序时，并非所有程序都显示（除非我单击箭头）。我只需要知道如何使面板更大，这样我就不必点击箭头

了

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JTabbedPane;


public class TestApplication {
    public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setSize(1000, 1000);
    frame.setTitle("RBA Test Application");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    JButton initialize = new JButton("Initialize");
    JButton connect = new JButton("Connect");
    JButton disconnect = new JButton("Disconnect");
    JButton shutdown = new JButton("Shut Down");
    JButton portsettings = new JButton("Port Settings");


    JPanel buttonPanel = new JPanel();
    buttonPanel.add(initialize);
    buttonPanel.add(connect);
    buttonPanel.add(disconnect);
    buttonPanel.add(shutdown);
    buttonPanel.add(portsettings);
    frame.add(buttonPanel);
    frame.add(buttonPanel, BorderLayout.NORTH);

    frame.pack();

    JTabbedPane tabbedPane = new JTabbedPane();
    tabbedPane.addTab("LLP", null, null, "Low Level Protocol");
    tabbedPane.addTab("POS",null, null, "Point Of Sale");
    tabbedPane.addTab("Test", null, null, "Test");

    JPanel tabsPanel = new JPanel();
    tabsPanel.add(tabbedPane);
    frame.add(tabsPanel);
    tabsPanel.setPreferredSize(new Dimension(900, 900));
    frame.add(tabsPanel, BorderLayout.CENTER);

    frame.pack();



    }






}

Answer 1

为您的tabsPanel提供合适的布局，即BorderLayout：

  JPanel tabsPanel = new JPanel(new BorderLayout()); //!!

注意，您不应该向GUI添加两次组件：

  frame.add(buttonPanel);
  frame.add(buttonPanel, BorderLayout.NORTH);

并且不需要多次调用pack（） 另外，您不应该调用setSize(...)，而应该更好地覆盖关键组件的getPreferredSize()。