我正在嘗試重新創建以下非?；镜?GUI：我的輸出如下：我很難格式化 JButtons。首先，無論我做什么，我都無法讓第二個面板“shapePane”顯示在第一個面板“colorPane”下方，其次，我無法正確地使按鈕的 y 軸變大以使它們更胖外貌。此外，頂部面板“shapePane”似乎隨著窗口大小的調整而動態移動，而第二個“colorPane”無論窗口大小如何調整都保持在固定位置。如果有人可以提供一些幫助，我將不勝感激
1 回答
繁星淼淼
TA貢獻1775條經驗 獲得超11個贊
以下應該讓你開始：
設置標簽的垂直和水平位置，使其顯示在左下角及其所需的寬度。為了獲得更大的布局靈活性，請考慮將其變形為JPanel：
label1 = new JLabel("current time here");
label1.setVerticalAlignment(SwingConstants.BOTTOM);
label1.setHorizontalAlignment(SwingConstants.LEFT);
label1.setPreferredSize(new Dimension(200, 0)); //height is set by the layout manger
getContentPane().add(label1, BorderLayout.WEST);
為按鈕窗格使用 GridLayout：
colorPane = new JPanel();
colorPane.setLayout(new GridLayout(2, 3));
初始化按鈕并將它們一一添加到網格窗格中：
redButton = makeButton("Red");
colorPane.add(redButton);
在哪里makeButton實現了避免重復代碼的方法：
private JButton makeButton(String text) {
JButton b = new JButton(text);
b.setHorizontalAlignment(SwingConstants.LEFT);
b.addActionListener(this);
b.setPreferredSize(new Dimension(125, 55)); //set preferred and let Layout manager do its work
return b;
}
設置文本區域的列數。它的高度由布局管理器設置：
textArea = new JTextArea(0,20);
getContentPane().add(textArea, BorderLayout.EAST);
把它們放在一起：
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;
public class GUI extends JFrame implements ActionListener
{
private final JButton circleButton, rectangleButton, redButton;
private final JButton greenButton, blueButton, exitButton;
private final JTextArea textArea;
private final JLabel label1;
private final JPanel colorPane;
private static final int ROWS = 2, COLS = 3;
public GUI (String title)
{
super(title);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//set label's vertical and horizontal position so it appears in the bottom left
//and and its desired width
//for more layout flexibility consider warping it in a JFrame
label1 = new JLabel("current time here");
label1.setVerticalAlignment(SwingConstants.BOTTOM);
label1.setHorizontalAlignment(SwingConstants.LEFT);
label1.setPreferredSize(new Dimension(200, 0)); //height is set by the layout manger
getContentPane().add(label1, BorderLayout.WEST);
//use a GridLayout for the buttons pane
colorPane = new JPanel();
colorPane.setLayout(new GridLayout(ROWS, COLS));
getContentPane().add(colorPane, BorderLayout.CENTER);//each BorderLayout position can hold ONE component
redButton = makeButton("Red");
colorPane.add(redButton);
greenButton = makeButton("Green");
colorPane.add(greenButton);
blueButton = makeButton("Blue");
colorPane.add(blueButton);
rectangleButton = makeButton("Rectangle");
colorPane.add(rectangleButton);
circleButton = makeButton("Circle");
colorPane.add(circleButton);
exitButton = makeButton("Exit");
colorPane.add(exitButton);
//set the text area number of columns. Its height is set by the layout manger
textArea = new JTextArea(0,20);
getContentPane().add(textArea, BorderLayout.EAST);
pack();
}
private JButton makeButton(String text) {
JButton b = new JButton(text);
b.setHorizontalAlignment(SwingConstants.LEFT);
b.addActionListener(this);
b.setPreferredSize(new Dimension(125, 55)); //set preferred and let Layout manager do its work
return b;
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(((JButton)e.getSource()).getText()+ " button pressed");
}
public static void main(String[] args) {
new GUI("My Gui").setVisible(true);
}
}
一個簡單的增強可能是將所有按鈕引用存儲在一個Map：
public class GUI extends JFrame implements ActionListener
{
private Map <String, JButton> buttons; // a map to hold references to all buttons
private final JTextArea textArea;
private final JLabel label1;
private final JPanel colorPane;
private static final int ROWS = 2, COLS = 3;
private static final String[] BUTTON_LABELS = {"Red","Green", "Blue", "Rectangle", "Circle", "Exit"};
public GUI (String title)
{
super(title);
buttons = new HashMap<>();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//set label's vertical and horizontal position so it appears in the bottom left
//and and its desired width
//for more layout flexibility consider warping it in a JFrame
label1 = new JLabel("current time here");
label1.setVerticalAlignment(SwingConstants.BOTTOM);
label1.setHorizontalAlignment(SwingConstants.LEFT);
label1.setPreferredSize(new Dimension(200, 0)); //height is set by the layout manger
getContentPane().add(label1, BorderLayout.WEST);
//use a GridLayout for the buttons pane
colorPane = new JPanel();
colorPane.setLayout(new GridLayout(ROWS, COLS));
getContentPane().add(colorPane, BorderLayout.CENTER);//each BorderLayout position can hold ONE component
for(String text : BUTTON_LABELS){
JButton button = makeButton(text);
colorPane.add(button);
buttons.put(text, button);
}
//set the text area number of columns. Its height is set by the layout manger
textArea = new JTextArea(0,20);
getContentPane().add(textArea, BorderLayout.EAST);
pack();
}
private JButton makeButton(String text) {
JButton b = new JButton(text);
b.setHorizontalAlignment(SwingConstants.LEFT);
b.addActionListener(this);
b.setPreferredSize(new Dimension(125, 55)); //set preferred and let Layout manager do its work
return b;
}
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(((JButton)e.getSource()).getText()+ " button pressed");
}
public static void main(String[] args) {
new GUI("My Gui").setVisible(true);
}
}
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