所以我一直在为我的大学班制作这个GUI温度转换器，我几乎完成了，但是我不明白为什么我无法获得btnCalc按钮来显示来自不同复选框的结果。我会显示一些东西 if(ae.getSource()==btnCalc) JOptionPane.showMessageDialog(this,"Button");
无论如何，如果能解决这个问题，我将非常感谢您的帮助。我只希望程序在点击计算按钮后显示结果。
package TempConverter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;
/**
*
* @author 00220682
*/
public class TempConvertGUI extends javax.swing.JFrame implements ActionListener{
public TempConvertGUI() {
initComponents();
btnCalc.addActionListener(this);
degrees.addActionListener(this);
CtoF.addActionListener(this);
FtoC.addActionListener(this);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
buttonGroup1 = new javax.swing.ButtonGroup();
jLabel1 = new javax.swing.JLabel();
degrees = new javax.swing.JTextField();
btnCalc = new javax.swing.JButton();
lblResults = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
CtoF = new javax.swing.JCheckBox();
FtoC = new javax.swing.JCheckBox();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Temperate Converter");
jLabel1.setText("Enter The Degrees:");
degrees.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
degreesActionPerformed(evt);
}
});
btnCalc.setText("Calculate");
btnCalc.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
btnCalcMouseClicked(evt);
}
});
btnCalc.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnCalcActionPerformed(evt);
}
});
jLabel2.setText("What would you like to convert?");
buttonGroup1.add(CtoF);
CtoF.setText("Celcius to Fahrenheit");
CtoF.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CtoFActionPerformed(evt);
}
});
buttonGroup1.add(FtoC);
FtoC.setText("Fahrenheit to Celcius");
FtoC.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
FtoCActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(degrees, javax.swing.GroupLayout.PREFERRED_SIZE, 226, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(btnCalc, javax.swing.GroupLayout.PREFERRED_SIZE, 258, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(FtoC)
.addGap(32, 32, 32)
.addComponent(CtoF))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 226, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(60, 60, 60)))))
.addGap(0, 0, Short.MAX_VALUE))
.addComponent(lblResults, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(degrees, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(FtoC)
.addComponent(CtoF))
.addGap(18, 18, 18)
.addComponent(btnCalc, javax.swing.GroupLayout.PREFERRED_SIZE, 47, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(lblResults, javax.swing.GroupLayout.PREFERRED_SIZE, 64, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void degreesActionPerformed(java.awt.event.ActionEvent evt) {
CtoF.setEnabled(true);
FtoC.setEnabled(true);
}
private void FtoCActionPerformed(java.awt.event.ActionEvent evt) {
}
private void CtoFActionPerformed(java.awt.event.ActionEvent evt) {
}
private void btnCalcMouseClicked(java.awt.event.MouseEvent evt) {
}
private void btnCalcActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(TempConvertGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TempConvertGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TempConvertGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TempConvertGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TempConvertGUI().setVisible(true);
CtoF.setEnabled(false);
FtoC.setEnabled(false);
}
});
}
// Variables declaration - do not modify
public static javax.swing.JCheckBox CtoF;
public static javax.swing.JCheckBox FtoC;
static javax.swing.JButton btnCalc;
private javax.swing.ButtonGroup buttonGroup1;
public static javax.swing.JTextField degrees;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel lblResults;
// End of variables declaration
@Override
public void actionPerformed(ActionEvent ae) {
double display = 0;
double x = 0;
CtoF DegreesC = new CtoF(0);
FtoC DegreesF = new FtoC(0);
if(ae.getSource()==CtoF){
double DinC = Double.parseDouble(degrees.getText());
DegreesC.setDegrees(DinC);
display = DegreesC.CtoFconvert();
x = 1;
}
else if (ae.getSource()==FtoC){
double DinF = Double.parseDouble(degrees.getText());
DegreesF.setDegrees(DinF);
display = DegreesF.FtoCconvert();
x = 2;
}
if (ae.getSource() == btnCalc){
if (x == 1){
lblResults.setText("<html>Degrees in Celcius: " + degrees.getText() + "<br>Degrees in Fahrenheit: " + display);
}
else if (x == 2){
lblResults.setText("<html>Degrees in Fahrenheit: " + degrees.getText() + "<br>Degrees in Celcius: " + display);
}
}
}
}
最佳答案
我不确定我是否完全理解该问题，但是请问这是否有帮助...
您在复选框和“计算”按钮上使用相同的ActionListener。您的构造函数使用
btnCalc.addActionListener(this);
degrees.addActionListener(this);
CtoF.addActionListener(this);
FtoC.addActionListener(this);
因此，当其中任何一个被按下时，该动作监听器都会触发。可能需要添加多个较小的，更具体的动作侦听器，而不是添加一个较大的侦听器来侦听源。因此，
btnCalc的动作侦听器将显示结果，而其他每个按钮都将具有自己的动作侦听器，这些侦听器将设置需要设置的变量。