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，并不是所有的选项都显示（除非我点击箭头）。我只需要知道如何使面板更大，所以，我不会有点击箭头

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

给你tabsPanel一个体面的布局，即BorderLayout的：

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

注意，你不应该被添加成分两次到GUI：

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

而且也没有必要呼吁包（）一次以上。
此外，您不应该致电setSize(...)，而是更好地覆盖关键组件的getPreferredSize()。