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# 默认忽略的文件
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/shelf/
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/workspace.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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<output url="file://$PROJECT_DIR$/out" />
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/lesson2.iml" filepath="$PROJECT_DIR$/lesson2.iml" />
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</modules>
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="VcsDirectoryMappings">
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<mapping directory="" vcs="Git" />
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</component>
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</project>
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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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public class Calculator extends JFrame implements ActionListener {
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private JTextField display;
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private StringBuilder input;
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public Calculator() {
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input = new StringBuilder();
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display = new JTextField();
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display.setEditable(false);
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display.setFont(new Font("Arial", Font.BOLD, 32));
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display.setHorizontalAlignment(JTextField.RIGHT);
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display.setBackground(Color.LIGHT_GRAY);
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JPanel panel = new JPanel();
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panel.setLayout(new GridLayout(5, 4, 10, 10)); // Increase number of rows
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panel.setBackground(Color.GRAY);
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String[] buttons = {
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"7", "8", "9", "/",
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"4", "5", "6", "*",
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"1", "2", "3", "-",
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"C", "0", ".", "+", // Add decimal point
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"<-", "=", "" // Add delete button
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};
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for (String text : buttons) {
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JButton button = new JButton(text);
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button.setFont(new Font("Arial", Font.PLAIN, 24));
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button.addActionListener(this);
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button.setBackground(Color.WHITE);
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panel.add(button);
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}
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add(display, BorderLayout.NORTH);
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add(panel, BorderLayout.CENTER);
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setTitle("Calculator");
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setSize(400, 500);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setLocationRelativeTo(null);
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}
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public void actionPerformed(ActionEvent e) {
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String command = e.getActionCommand();
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if (command.charAt(0) == 'C') {
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input.setLength(0);
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display.setText("");
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} else if (command.equals("<-")) { // Delete the last character
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if (input.length() > 0) {
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input.setLength(input.length() - 1);
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display.setText(input.toString());
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}
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} else if (command.charAt(0) == '=') {
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try {
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double result = evaluate(input.toString());
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display.setText(String.valueOf(result));
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input.setLength(0);
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} catch (ScriptException ex) {
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display.setText("Error");
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input.setLength(0);
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}
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} else {
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input.append(command);
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display.setText(input.toString());
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}
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}
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private double evaluate(String expression) throws ScriptException {
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ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
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return ((Number) engine.eval(expression)).doubleValue();
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(() -> {
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Calculator calculator = new Calculator();
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calculator.setVisible(true);
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});
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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@ -0,0 +1,3 @@
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# 默认忽略的文件
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/shelf/
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/workspace.xml
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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<output url="file://$PROJECT_DIR$/out" />
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</component>
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</project>
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@ -0,0 +1,8 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/lesson2.iml" filepath="$PROJECT_DIR$/lesson2.iml" />
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</modules>
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</component>
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</project>
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="VcsDirectoryMappings">
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<mapping directory="" vcs="Git" />
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</component>
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</project>
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Binary file not shown.
@ -0,0 +1,11 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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