整数计算：

用swing组件来实现整数计算，需要对整数计算的值进行校验。

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

public class IntegerCalculator extends JFrame implements ActionListener {
    private JCheckBox[] checkBoxes;
    private JTextField[] textFields;
    private JButton selectAllButton;
    private JButton multiSelectButton;
    private JButton sumButton;
    private JTextField sumDisplayField;

    public IntegerCalculator(int numIntegers) {
        setTitle("选择整数计算");
        setSize(600, 400);
        this.setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(numIntegers + 3, 2));

        checkBoxes = new JCheckBox[numIntegers];
        textFields = new JTextField[numIntegers];
        for (int i = 0; i < numIntegers; i++) {
            checkBoxes[i] = new JCheckBox();
            textFields[i] = new JTextField();
            panel.add(checkBoxes[i]);
            panel.add(textFields[i]);
        }

        this.selectAllButton = new JButton("全选");
        panel.add(selectAllButton);
        this.selectAllButton.addActionListener(this);

        this.multiSelectButton = new JButton("多项选择");
        panel.add(multiSelectButton);
        this.multiSelectButton.addActionListener(this);

        this.sumButton = new JButton("求和");
        panel.add(sumButton);
        this.sumButton.addActionListener(this);

        sumDisplayField = new JTextField();
        sumDisplayField.setEditable(false);

        panel.add(sumDisplayField);

        add(panel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent event) {
        if (event.getSource() == this.selectAllButton) {
            for (JCheckBox checkBox : checkBoxes) {
                checkBox.setSelected(true);
            }
        } else if (event.getSource() == this.multiSelectButton) {
            int[] selectedIntegers = new int[checkBoxes.length];
            int count = 0;
            for (int i = 0; i < checkBoxes.length; i++) {
                if (checkBoxes[i].isSelected()) {
                    String text = textFields[i].getText();
                    if (!text.isEmpty()) {
                        try {
                            selectedIntegers[count++] = Integer.parseInt(text);
                        } catch (NumberFormatException ex) {
                            JOptionPane.showMessageDialog(null, text + "不能转换成数字,忽略");
                            return;
                        }
                    }
                }
            }
            int[] validSelectedIntegers = new int[count];
            for (int i = 0; i < count; i++) {
                validSelectedIntegers[i] = selectedIntegers[i];
            }
            if (count > 0) {
                String displayText = "[";
                for (int i = 0; i < count; i++) {
                    displayText += validSelectedIntegers[i];
                    if (i < count - 1) {
                        displayText += ", ";
                    }
                }
                displayText += "]";
                JOptionPane.showMessageDialog(null, "选择整数：" + displayText);
            }
        } else if (event.getSource() == this.sumButton) {
            int sum = sum(textFields);
            if (sum != 0) {
                sumDisplayField.setText(String.valueOf(sum));
            } else {
                sumDisplayField.setText("0");
            }
        }
    }

    public int sum(JTextField[] text) {
        int sum = 0;
        for (int i = 0; i < text.length; i++) {
            String textArea = text[i].getText();
            if (!textArea.isEmpty() && checkBoxes[i].isSelected()) {
                try {
                    int x = Integer.parseInt(textArea);
                    sum += x;
                } catch (Exception e) {
                    String str = textArea + "不能被转换成数字，忽略";
                    JOptionPane.showMessageDialog(null, str);
                    return 0;
                }
            }
        }
        return sum;
    }

    public static void main(String[] args) {
        IntegerCalculator calculator = new IntegerCalculator(6);
    }
}