无法在GridLayout中设置我的按钮的大小

Question

我正在尝试使用Java中的GridLayout构建示例应用程序。但我无法重新调整我的按钮大小。请帮助我做到这一点。

代码中有四个网格布局。

我已经使用了setSize（width，height）函数和setPreferredSize函数。但我无法设置按钮的大小。

下面是代码

import java.awt.*; 

import javax.swing.*; 
public class Details2 { 

    static JButton btn1,btn2; 
    public static void main(String[] a) { 
     JFrame myFrame = new JFrame("Medical History Form"); 
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     myFrame.setSize(700,700); 
     Container myPane = myFrame.getContentPane(); 
     myPane.setLayout(new GridLayout(2,1)); 
     myPane.add(getFieldPanel()); 
     myPane.add(getButtonPanel()); 
     myPane.setPreferredSize(new Dimension(100,100)); 
     myFrame.setVisible(true); 
    } 

    private static JPanel getFieldPanel() { 
     JPanel p = new JPanel(new GridLayout(4,2)); 
     p.setBorder(BorderFactory.createTitledBorder("Details")); 
     p.add(new JLabel("Please check in the here")); 

     p.add(new JCheckBox("Nothing till now",false)); 
     p.add(getPanel()); 

     return p; 
    } 

    private static JPanel getButtonPanel() { 
     GridLayout g =new GridLayout(1,2); 
     JPanel p = new JPanel(g); 
     btn1 = new JButton("Submit"); 
     btn2 = new JButton("Reset"); 

     p.add(btn1).setPreferredSize(new Dimension(100,100)); 
     p.add(btn2).setPreferredSize(new Dimension(100,100)); 
     p.setPreferredSize(new Dimension(100,100)); 
     return p; 
    } 

    private static JPanel getPanel() { 
     JPanel p = new JPanel(new GridLayout(5,2)); 
     p.add(new JCheckBox("A",false)); 
     p.add(new JCheckBox("B",false)); 
     p.add(new JCheckBox("C",false)); 
     p.add(new JCheckBox("D",false)); 
     p.add(new JCheckBox("E",false)); 
     p.add(new JCheckBox("F",false)); 
     p.add(new JCheckBox("G",false)); 
     p.add(new JCheckBox("E",false)); 
     p.add(new JCheckBox("H",false)); 
     p.add(new JCheckBox("I",false)); 
     return p; 
    } 
} 

Answer 1

我相信设置网格布局（2,2）将覆盖在面板尺寸做了更改。更确切地说，使用GridBagConStraints;你可以参考下面的代码来理解它。

private JTextField field1 = new JTextField(); 
private JButton addBtn = new JButton("Save: "); 

public void addComponents(Container pane) { 
    pane.setLayout(new GridBagLayout()); 
    GridBagConstraints c = new GridBagConstraints(); 
// Components 
c.gridwidth = 1; 
c.weightx = .01; 
c.weighty = .2; 
c.gridx = 0; 
c.gridy = 1; 
pane.add(field1, c); 

    c.gridwidth = 1; 
c.weightx = .01; 
c.weighty = .2; 
c.gridx = 0; 
c.gridy = 1; 
pane.add(addBtn, c); 
} 

public MainView() { 
    //Create and set up the window. 
    JFrame frame = new JFrame("NAME"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    //Set up the content pane. 
    addComponents(frame.getContentPane()); 

    //Display the window. 
    frame.pack(); 
    frame.setVisible(true); 
    frame.setResizable(false); 
    frame.setSize(400, 125); 
    frame.setLocation(400, 300); 
} 

Answer 2

如果要控制组件的大小，请不要使用布局。做这样的事情：

private static JPanel getButtonPanel() { 

    JPanel p = new JPanel(); 
    p.setLayout(null); 

    btn1 = new JButton("Submit"); 
    btn2 = new JButton("Reset"); 
    btn1.setBounds(x, y, width, height); 
    btn2.setBounds(x, y, width, height); 
    p.add(btn1); 
    p.add(btn2); 
    return p;