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84 lines
2.4 KiB
84 lines
2.4 KiB
package hello.demo;
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import javafx.application.Application;
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import javafx.geometry.Insets;
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import javafx.scene.Scene;
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import javafx.scene.control.Button;
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import javafx.scene.control.TextField;
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import javafx.scene.layout.GridPane;
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import javafx.stage.Stage;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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public class Calculator extends Application {
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private TextField display;
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@Override
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public void start(Stage primaryStage) {
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primaryStage.setTitle("计算器");
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display = new TextField();
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display.setEditable(false);
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GridPane grid = new GridPane();
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grid.setPadding(new Insets(10));
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grid.setVgap(5);
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grid.setHgap(5);
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// 按钮定义，包括取余运算 "%"
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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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"0", "C", "=", "+",
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"%"
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};
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int index = 0;
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for (int row = 0; row < 5; row++) { // 修改行数以添加新按钮
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for (int col = 0; col < 4; col++) {
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if (index >= buttons.length) break; // 防止数组越界
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Button btn = new Button(buttons[index]);
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btn.setMinSize(50, 50);
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btn.setOnAction(e -> handleButtonClick(btn.getText()));
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grid.add(btn, col, row);
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index++;
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}
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}
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grid.add(display, 0, 5, 4, 1); // 显示区域在最后一行
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Scene scene = new Scene(grid, 250, 350);
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primaryStage.setScene(scene);
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primaryStage.show();
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}
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private void handleButtonClick(String text) {
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if ("C".equals(text)) {
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display.clear();
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} else if ("=".equals(text)) {
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calculateResult();
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} else {
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display.appendText(text);
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}
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}
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private void calculateResult() {
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try {
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String input = display.getText();
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// 使用脚本引擎执行表达式
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ScriptEngineManager manager = new ScriptEngineManager();
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ScriptEngine engine = manager.getEngineByName("JavaScript");
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Object result = engine.eval(input);
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display.setText(result.toString());
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} catch (Exception e) {
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display.setText("错误");
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}
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}
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public static void main(String[] args) {
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launch(args);
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}
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}
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