6-47选择整数计算

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);}
}