如何在JavaSwing中对齐组件?
我正在用Java构建一个简单的初学者应用程序,我需要您帮助我调整组件。我要做的是将组件(JLabel“name”)对齐到面板的左侧。我已经尝试过使用“new FlowLayout(FlowLayout.LEFT)”,但它不起作用,所以我请求您帮助我。下面是框架的图片和源代码
public class firstClass extends JFrame implements ActionListener {
private JFrame frame1;
private JFrame frame2;
private JPanel mainPanelFirst;
private JPanel secondPanel;
private JButton newWindowButton;
private int mulitplyPanels;
private JLabel leftLabel;
private JLabel rightLabel;
private JComboBox leftCB;
private JComboBox rightCB;
第一个窗口:
public JFrame createMainUI(){
frame1 = new JFrame("Main frame");
frame1.setSize(600,600);
frame1.setResizable(false);
frame1.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame1.setVisible(true);
mainPanelFirst = new JPanel();
mainPanelFirst.setLayout(new FlowLayout());
frame1.add(mainPanelFirst);
newWindowButton = new JButton("Open new window");
newWindowButton.addActionListener(this);
mainPanelFirst.add(newWindowButton);
return frame1;
}
第二个窗口(包括我要对齐的标签):
public JFrame createSecondUI() {
frame2 = new JFrame("Second frame");
frame2.setSize(600, 600);
frame2.setResizable(false);
frame2.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame2.setVisible(true);
secondPanel = new JPanel();
secondPanel.setLayout(new FlowLayout());
secondPanel.setBackground(Color.gray);
frame2.add(secondPanel);
JPanel topPanel = new JPanel();
topPanel.setLayout(new FlowLayout(70,400,20));
topPanel.setBackground(Color.WHITE);
secondPanel.add(topPanel);
leftLabel = new JLabel("Name:");
topPanel.add(leftLabel);
return frame2;
}
@Override
public void actionPerformed(ActionEvent e) {
createSecondUI();
}
}
谢谢你的帮助:)
# 1 楼答案
警告请阅读以下内容:Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?
由于JFrame不可调整大小,请为topPanel指定一个定义的大小:
# 2 楼答案
我建议您的应用程序使用布局管理器。你要找的最有可能是BorderLayout,除非你想要特定的功能来控制对象的布局位置和方式
希望这有帮助
Layout Managers
How to use BorderLayout