0

我正在使用 Net beans 制作一个简单的计算器，但 Button 和 text field 之间存在问题。我想要那个东西，我在单击一个按钮后单击按钮“1”，它应该显示一个但没有显示，请帮助如何在它们之间设置“+”按钮，请帮助。/* * 要更改此模板，请选择工具 | 模板 * 并在编辑器中打开模板。*/

/**
 *
 * @author Administrator
 */
public class Calculator extends javax.swing.JFrame {

    /**
     * Creates new form Calculator
     */
    public Calculator() {
        initComponents();
    }

    /**
     * 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() {

        jPanel1 = new javax.swing.JPanel();
        jButton12 = new javax.swing.JButton();
        jButton10 = new javax.swing.JButton();
        jButton11 = new javax.swing.JButton();
        jButton9 = new javax.swing.JButton();
        jButton1 = new javax.swing.JButton();
        jTextField1 = new javax.swing.JTextField();
        jButton8 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton7 = new javax.swing.JButton();
        jButton6 = new javax.swing.JButton();
        jButton13 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Rajendra Calculator", javax.swing.border.TitledBorder.CENTER, javax.swing.border.TitledBorder.ABOVE_TOP));

        jButton12.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton12.setText("=");

        jButton10.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton10.setText("0");

        jButton11.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton11.setText("+");
        jButton11.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton11ActionPerformed(evt);
            }
        });

        jButton9.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton9.setText("9");

        jButton1.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton1.setText("1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jTextField1.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        jTextField1.setText("0");
        jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1ActionPerformed(evt);
            }
        });

        jButton8.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton8.setText("8");

        jButton5.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton5.setText("5");

        jButton4.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton4.setText("4");
        jButton4.setToolTipText("");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        jButton2.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton2.setText("2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton7.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton7.setText("7");

        jButton6.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton6.setText("6");

        jButton13.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton13.setText("Clear");

        jButton3.setFont(new java.awt.Font("Arial Black", 0, 11)); // NOI18N
        jButton3.setText("3");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addComponent(jButton4)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton5)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton6))
                        .addComponent(jTextField1)
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addComponent(jButton1)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton2)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton3))
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addComponent(jButton7)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton8)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(jButton9)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jButton11, javax.swing.GroupLayout.DEFAULT_SIZE, 65, Short.MAX_VALUE)
                            .addComponent(jButton10, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jButton12, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(jButton13, javax.swing.GroupLayout.DEFAULT_SIZE, 66, Short.MAX_VALUE)))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(25, Short.MAX_VALUE)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton4)
                    .addComponent(jButton5)
                    .addComponent(jButton6))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton7)
                    .addComponent(jButton8)
                    .addComponent(jButton9))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton10)
                    .addComponent(jButton13))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton11)
                    .addComponent(jButton12))
                .addContainerGap())
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(18, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 jTextField1.setText(jTextField1.getText()+"1");
    }                                        

    private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
    }                                           

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
   jTextField1.setText(jTextField1.getText()+"2"); // TODO add your handling code here:
    }                                        

    private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {                                          
    int valA = Integer.parseInt(jTextField1.getText());
int valB = Integer.parseInt(jTextField1.getText());        // TODO add your handling code here:

        int valC = valA+valB;
        jTextField1.append(Integer.toString(valC));
        jTextField1.append("\n");    // 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(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Calculator().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton10;
    private javax.swing.JButton jButton11;
    private javax.swing.JButton jButton12;
    private javax.swing.JButton jButton13;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JButton jButton6;
    private javax.swing.JButton jButton7;
    private javax.swing.JButton jButton8;
    private javax.swing.JButton jButton9;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   
}
4

2 回答 2

0

JTextField没有append方法，只有setText方法。

如果您真的需要“附加”功能，那么您需要使用JTextArea...

花点时间阅读使用 Swing 创建 GUI和使用文本组件。

就个人而言，我会抛弃表单设计器并尽可能地了解 API，它将更好地了解表单设计器的功能以及何时使用它......恕我直言

更新

您的基本流程已关闭。用户输入一个值并按“+”，然后您尝试将文本字段中的值添加到自身并将值重新应用回文本字段......这意味着用户实际上不太可能能够将两个值相加。

List相反，您应该在每次用户单击“+”按钮并清除文本字段以获取下一个值时以某种方式将值存储在文本字段中。当他们按下“=”按钮时，您应该简单地遍历此列表并将结果放入文本字​​段并清除列表...

例如...

private List<Integer> values = new ArrayList<Integer>(25);
/*...*/

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {
    try {
        int valA = Integer.parseInt(jTextField1.getText());
        values.add(valA);
    } catch (NumberFormatException exp) {
        exp.printStackTrace();
    }
    jTextField1.setText("");
}

您还没有actionPerformed为“=”按钮提供方法，但它的内容看起来像......

int result = 0;
for (int value : values) {
    result += value;
}
values.clear();
jTextField1.setText(Integer.toString(result));
于 2013-09-13T02:48:43.527 回答
0

...如何设置 JButton ..我在哪里按下它，它在 textField 上显示“1”

通常，在这种情况下，文本字段将是不可编辑的，因此您可以使用以下方法有效地将文本“附加”到文本字段：

textField.replaceSelection("1");

但是，更好的方法是为所有按钮共享一个 Action：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class ButtonCalculator extends JPanel
{
    private JButton[] buttons;
    private JTextField display;

    public ButtonCalculator()
    {
        Action numberAction = new AbstractAction()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                display.replaceSelection(e.getActionCommand());
            }
        };

        display = new JTextField();
        display.setEditable( false );
        display.setHorizontalAlignment(JTextField.RIGHT);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout( new GridLayout(0, 5) );
        buttons = new JButton[10];

        for (int i = 0; i < buttons.length; i++)
        {
            String text = String.valueOf(i);
            JButton button = new JButton( text );
            button.addActionListener( numberAction );
            buttons[i] = button;
            buttonPanel.add( button );

            //  Support Key Bindings

            KeyStroke pressed = KeyStroke.getKeyStroke(text);
            InputMap inputMap = button.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
            inputMap.put(pressed, text);
            button.getActionMap().put(text, numberAction);
        }

        setLayout( new BorderLayout() );
        add(display, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.SOUTH);
    }

    private static void createAndShowUI()
    {
        UIManager.put("Button.margin", new Insets(5, 10, 5, 10) );
        JFrame frame = new JFrame("Button Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new ButtonCalculator() );
        frame.setResizable( false );
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}
于 2013-09-13T04:19:19.573 回答