如何在Java Swing中对齐组件?

时间:2017-05-13 22:15:38

标签: java swing layout-manager

我正在用Java构建一个简单的初学者应用程序,我需要你的帮助来调整组件。我想要做的是将组件(JLabel" name")对齐到面板的左侧。我已经尝试过使用"新的FlowLayout(FlowLayout.LEFT)"但它没有用,所以我请你帮助我。这是下面框架和源代码的图片。

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:

https://i.stack.imgur.com/DhXXM.png

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):

https://i.stack.imgur.com/VRIFr.png

 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();

    }
}

感谢您的帮助:)

2 个答案:

答案 0 :(得分:0)

警告也请阅读此内容:Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?

由于JFrame是不可调整大小的,因此请为topPanel指定一个定义的大小:

JPanel topPanel = new JPanel();
topPanel.setPreferredSize(new Dimension(600,100));
topPanel.setLayout(new FlowLayout(FlowLayout.LEFT,400,20));

答案 1 :(得分:0)

我建议您为自己的应用使用布局管理器。您正在寻找的那个很可能是BorderLayout,除非您想要特定的能力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