用户将输入 1 到 99 之间的数字。我已经编写了大部分代码，但我无法弄清楚如何使用计算按钮进行计算。我真的可以使用一些逐步的帮助，如果有人可以帮助我，我愿意学习。我是一个非常初学者。
package minimumchris;
import javax.swing.JButton;
import javax.swing.JTextField;
public class useri extends javax.swing.JFrame {
public useri() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("enter a number between 1-99");
jLabel2.setText("quarters");
jLabel3.setText("dimes");
jLabel4.setText("nickels");
jLabel5.setText("pennies");
jButton1.setText("calculate");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("clear");
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(jLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 197, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 47, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(layout.createSequentialGroup()
.add(66, 66, 66)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jLabel5)
.add(jLabel4)
.add(jLabel3)
.add(jLabel2))
.add(0, 0, Short.MAX_VALUE)))
.addContainerGap())
.add(layout.createSequentialGroup()
.addContainerGap()
.add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 195, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jButton2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 177, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addContainerGap(16, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(jLabel1))
.add(32, 32, 32)
.add(jLabel2)
.add(18, 18, 18)
.add(jLabel3)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
.add(jLabel4)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jLabel5)
.add(29, 29, 29)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
.add(jButton2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 73, Short.MAX_VALUE)
.add(jButton1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap(32, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int cntrquart = 0;
int cntrdimes = 0;
int cntrpennies = 0;
int cntrnickels = 0;
JTextField jTextField=new JTextField(); // initialize textFild
JButton calculate =jButton1;
int quarters = Integer.parseInt(jTextField.getText());
while (quarters >= 25)
{
quarters = quarters - 25;
cntrquart++;
}
//dimes
int dimes = quarters;
while (dimes >= 10)
{
dimes = dimes - 10;
cntrdimes++;
}
//nickels
int nickels = dimes;
while (nickels >= 5)
{
nickels = nickels - 5;
cntrnickels++;
}
//pennies
int pennies = nickels;
while (pennies >= 1)
{
pennies = pennies - 1;
cntrpennies++;
}
jLabel2.setText("Quarter" + cntrquart );
jLabel3.setText("Dimes:" + cntrdimes );
jLabel4.setText("Nickels:" + cntrnickels );
jLabel5.setText("Pennies:" + cntrpennies );
}
/**
* @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(useri.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(useri.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(useri.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(useri.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new useri().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
最佳答案
问题是当按下“计算”时您正在使用全新的 JTextField:
JTextField jTextField=new JTextField(); // useless
JButton calculate =jButton1; // useless
int quarters = Integer.parseInt(jTextField.getText()); // should use jTextField1 (probably)
关于java - 我需要帮助。我正在编写一个有 GUI 的程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20487381/