我正在尝试创建一个java GUI,一旦从下拉列表中选择了值并按下了apply按钮,它就会输出一个值。问题是这是我第一次在java中创建GUI,我只是使用了一些我找到的示例代码并重新编写了它,但我不确定如何输出我想要的值。代码在下面,我想输出的值是“颜色”。
package state;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUI extends JFrame {
Font font = new Font("Cambria", Font.PLAIN, 20);
static final String Colour[] = {"Blue", "Yellow"};
static final String Pitch[] = {"Main Pitch", "Side Pitch"};
final static int maxGap = 20;
JComboBox colourComboBox;
JComboBox pitchComboBox;
Label colourLabel;
Label pitchLabel;
JButton applyButton = new JButton("Apply settings");
GridLayout experimentLayout = new GridLayout(0,2);
public GUI(String name) {
super(name);
setResizable(false);
}
public void initGaps() {
colourComboBox = new JComboBox(Colour);
colourComboBox.setFont(font);
pitchComboBox = new JComboBox(Pitch);
pitchComboBox.setFont(font);
}
public void addComponentsToPane(final Container pane) {
initGaps();
final JPanel compsToExperiment = new JPanel();
compsToExperiment.setLayout(experimentLayout);
JPanel controls = new JPanel();
controls.setLayout(new GridLayout(0,2));
//Set up components preferred size
JButton b = new JButton("Just fake button");
Dimension buttonSize = b.getPreferredSize();
compsToExperiment.setPreferredSize(new Dimension((int)(buttonSize.getWidth() * 3.3)+maxGap,
(int)(buttonSize.getHeight() * 1.5)+maxGap * 5));
//Add buttons to experiment with Grid Layout
colourLabel = new Label("Select Robot Colour:");
colourLabel.setFont(font);
pitchLabel = new Label("Select Pitch:");
pitchLabel.setFont(font);
compsToExperiment.add(colourLabel);
compsToExperiment.add(colourComboBox);
compsToExperiment.add(pitchLabel);
compsToExperiment.add(pitchComboBox);
controls.add(applyButton);
//Process the Apply gaps button press
applyButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String colour = (String)colourComboBox.getSelectedItem();
String pitch = (String)pitchComboBox.getSelectedItem();
}
});
pane.add(compsToExperiment, BorderLayout.NORTH);
pane.add(new JSeparator(), BorderLayout.CENTER);
pane.add(controls, BorderLayout.SOUTH);
}
/**
* Create the GUI and show it. For thread safety,
* this method is invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
GUI frame = new GUI("Match Conditions");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
frame.addComponentsToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
/* Use an appropriate Look and Feel */
try {
//UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
/* Turn off metal's use of bold fonts */
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
答案 0 :(得分:3)
您可以使用getSelectedItem() function in JComboBox获取文字。
离。
pitchComboBox.getSelectedItem().toString()
colourComboBox.getSelectedItem().toString()
答案 1 :(得分:1)
将输出显示为??
您可以使用此...
JOptionPane.showMessageDialog(null, "Colour"+colour);
在对话框中显示。