Merge remote-tracking branch 'origin/main'

# Conflicts:
#	_02/src/Calculator.java

_02/src/Calculator.java

@@ -1,100 +0,0 @@
-import javafx.application.Application;
-import javafx.geometry.Insets;
-import javafx.scene.Scene;
-import javafx.scene.control.Button;
-import javafx.scene.control.TextField;
-import javafx.scene.layout.GridPane;
-import javafx.scene.layout.VBox;
-import javafx.stage.Stage;
-
-public class Calculator extends Application {
-    private TextField display;
-    private double result = 0;
-    private String lastCommand = "=";
-    private boolean start = true;
-
-    @Override
-    public void start(Stage primaryStage) {
-        // 创建显示区域
-        display = new TextField("0");
-        display.setEditable(false);
-        display.setPrefColumnCount(15);
-
-        // 创建按钮
-        GridPane grid = new GridPane();
-        grid.setPadding(new Insets(10));
-        grid.setHgap(10);
-        grid.setVgap(10);
-
-        // 按钮布局
-        String[][] buttonLayout = {
-                {"7", "8", "9", "/"},
-                {"4", "5", "6", "*"},
-                {"1", "2", "3", "-"},
-                {"0", ".", "=", "+"}
-        };
-
-        for (int i = 0; i < 4; i++) {
-            for (int j = 0; j < 4; j++) {
-                Button button = new Button(buttonLayout[i][j]);
-                button.setOnAction(e -> processButtonPress(button.getText()));
-                grid.add(button, j, i);
-            }
-        }
-
-        // 创建主布局
-        VBox root = new VBox();
-        root.setPadding(new Insets(10));
-        root.setSpacing(10);
-        root.getChildren().addAll(display, grid);
-
-        // 创建场景
-        Scene scene = new Scene(root, 300, 300);
-
-        // 设置舞台
-        primaryStage.setTitle("简易计算器");
-        primaryStage.setScene(scene);
-        primaryStage.show();
-    }
-
-    private void processButtonPress(String command) {
-        if (command.matches("[0-9]")) {
-            if (start) {
-                display.setText(command);
-                start = false;
-            } else {
-                display.setText(display.getText() + command);
-            }
-        } else if (command.equals(".")) {
-            if (start) {
-                display.setText("0.");
-                start = false;
-            } else if (!display.getText().contains(".")) {
-                display.setText(display.getText() + ".");
-            }
-        } else {
-            calculate(Double.parseDouble(display.getText()));
-            lastCommand = command;
-            start = true;
-        }
-    }
-
-    private void calculate(double n) {
-        if (lastCommand.equals("+")) {
-            result += n;
-        } else if (lastCommand.equals("-")) {
-            result -= n;
-        } else if (lastCommand.equals("*")) {
-            result *= n;
-        } else if (lastCommand.equals("/")) {
-            result /= n;
-        } else {
-            result = n;
-        }
-        display.setText(String.format("%.0f", result));
-    }
-
-    public static void main(String[] args) {
-        launch(args);
-    }
-}