0

Net Bean を使用して簡単な電卓を作成していますが、ボタンとテキスト フィールドの間に問題があります。ボタンをクリックした後に「1」ボタンをクリックすると、1つが表示されるはずでしたが、何も表示されないことが必要です。その間に「+」ボタンを設定する方法を教えてください。/* * このテンプレートを変更するには、[ツール] | [ツール] を選択します。テンプレート * エディターでテンプレートを開きます。*/

/**
 *
 * @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 に答える 2

0

... JButton の設定方法 .. それを押すと、textField に "1" が表示されます

通常、このような場合、テキスト フィールドは編集できないため、次を使用してテキスト フィールドにテキストを効果的に「追加」できます。

textField.replaceSelection("1");

ただし、より良いアプローチは、すべてのボタンのアクションを共有することです。

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 に答える
0

JTextFieldメソッドはありません。メソッドappendがあるだけsetTextです。

「追加」機能が本当に必要な場合は、JTextArea代わりに使用する必要があります...

時間をかけて Swingを使用した GUI の作成 と テキスト コンポーネントの使用を読んでください。

個人的には、私はフォーム デザイナーを捨てて、できる限り API を理解するようにします。そうすれば、フォーム デザイナーが何をするのか、いつそれを使用するのが適切なのかをより深く理解できます... IMHO

更新しました

あなたの基本的な流れはオフです。ユーザーが値を入力して「+」を押すと、テキスト フィールドの値をそれ自体に追加して、その値をテキスト フィールドに再適用しようとします...これは、ユーザーが実際に2 つの値を合計することができます。

List代わりに、ユーザーが「+」ボタンをクリックするたびに何らかの形でテキスト フィールドに値を保存し、次の値のためにテキスト フィールドをクリアする必要があります。「=」ボタンを押すと、このリストを繰り返し処理し、結果をテキストフィールドに入力してリストをクリアする必要があります...

例えば...

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("");
}

「=」ボタンのメソッドを提供していませんが、actionPerformed内容は次のようになります...

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