system/system.java

package java1292.lesson051292;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;import javafx.scene.control.Alert;

        import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class system extends Application {

    private TextField inputTextField;
    private TextField sourceBaseTextField;
    private TextField targetBaseTextField;
    private Label resultLabel;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Base Converter");//

        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setPadding(new Insets(10));
        grid.setVgap(8);//
        grid.setHgap(10);

        Label inputLabel = new Label("输入数字:");//
        inputTextField = new TextField();

        Label sourceBaseLabel = new Label("当前进制 (2-16):");
        sourceBaseTextField = new TextField();
        sourceBaseTextField.setText("10"); // Default to decimal

        Label targetBaseLabel = new Label("目标进制 (2-16):");
        targetBaseTextField = new TextField();
        targetBaseTextField.setText("2"); // Default to binary

        Button convertButton = new Button("确认");
        resultLabel = new Label();

        grid.add(inputLabel, 0, 0);
        grid.add(inputTextField, 1, 0);
        grid.add(sourceBaseLabel, 0, 1);
        grid.add(sourceBaseTextField, 1, 1);
        grid.add(targetBaseLabel, 0, 2);
        grid.add(targetBaseTextField, 1, 2);
        grid.add(convertButton, 1, 3);
        grid.add(resultLabel, 1, 4);

        convertButton.setOnAction(event -> convert());

        Scene scene = new Scene(grid, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void convert() {
        String input = inputTextField.getText();
        String sourceBaseStr = sourceBaseTextField.getText();
        String targetBaseStr = targetBaseTextField.getText();

        try {
            int sourceBase = Integer.parseInt(sourceBaseStr);
            int targetBase = Integer.parseInt(targetBaseStr);

            if (sourceBase < 2 || sourceBase > 16 || targetBase < 2 || targetBase > 16) {
                throw new IllegalArgumentException("Base must be between 2 and 16.");
            }

            long number = Long.parseLong(input, sourceBase);
            String result = convertToBase(number, targetBase);

            resultLabel.setText("Result: " + result);
        } catch (NumberFormatException e) {
            showAlert(AlertType.ERROR, "Invalid Input", "Number format error: " + e.getMessage());
        } catch (IllegalArgumentException e) {
            showAlert(AlertType.ERROR, "Invalid Input", "Illegal argument: " + e.getMessage());
        }
    }

    private String convertToBase(long number, int base) {
        if (number == 0) {
            return "0";
        }
        StringBuilder result = new StringBuilder();
        char[] digits = "0123456789ABCDEF".toCharArray();
        while (number > 0) {
            result.insert(0, digits[(int) (number % base)]);
            number /= base;
        }
        return result.toString();
    }

    private void showAlert(AlertType alertType, String title, String content) {
        Alert alert = new Alert(alertType);
        alert.setTitle(title);
        alert.setContentText(content);
        alert.setHeaderText(null);
        alert.showAndWait();
    }

    public static void main(String[] args) {
        launch(args);
    }
}