ADD file via upload

BaseConverterApp.java

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+import javafx.application.Application;
+import javafx.geometry.Insets;
+import javafx.scene.Scene;
+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 BaseConverterApp extends Application {
+
+    @Override
+    public void start(Stage primaryStage) {
+        GridPane grid = new GridPane();
+        grid.setPadding(new Insets(10, 10, 10, 10));
+        grid.setVgap(8);
+        grid.setHgap(10);
+
+        // 输入原始数值
+        Label lblNumber = new Label("数值:");
+        TextField txtNumber = new TextField();
+        grid.add(lblNumber, 0, 0);
+        grid.add(txtNumber, 1, 0);
+
+        // 输入原始进制
+        Label lblFromBase = new Label("原始进制:");
+        TextField txtFromBase = new TextField();
+        grid.add(lblFromBase, 0, 1);
+        grid.add(txtFromBase, 1, 1);
+
+        // 输入目标进制
+        Label lblToBase = new Label("目标进制:");
+        TextField txtToBase = new TextField();
+        grid.add(lblToBase, 0, 2);
+        grid.add(txtToBase, 1, 2);
+
+        // 转换按钮
+        Button btnConvert = new Button("转换");
+        grid.add(btnConvert, 1, 3);
+
+        // 显示结果
+        Label lblResult = new Label("结果:");
+        grid.add(lblResult, 1, 4);
+
+        // 设置场景
+        Scene scene = new Scene(grid, 300, 250);
+        primaryStage.setScene(scene);
+        primaryStage.setTitle("进制转换器");
+
+        // 添加按钮点击事件处理器
+        btnConvert.setOnAction(event -> {
+            String number = txtNumber.getText();
+            int fromBase = Integer.parseInt(txtFromBase.getText());
+            int toBase = Integer.parseInt(txtToBase.getText());
+
+            try {
+                long decimal = Long.parseLong(number, fromBase);
+                String converted = Long.toString(decimal, toBase).toUpperCase();
+                lblResult.setText("结果: " + converted);
+            } catch (NumberFormatException e) {
+                lblResult.setText("错误: 无效的输入或进制。");
+            }
+        });
+
+        primaryStage.show();
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}