fixed filename error

data/1.Java初阶/2.第一个Java程序/1.编辑Java源代码/HelloWorld.md

+# Hello World
+
+以下 `Hello World` 程序中，能够正确输出内容的是：
+
+## A
+
+```java
+package app;
+
+public class App {
+    public static void main(String[] args){
+        System.out.println("Hello World");
+    }
+}
+```
+
+## B
+
+```java
+package app;
+
+public class App {
+    public int main(){
+        System.out.printf("Hello World");
+        return 0;
+    }
+}
+```
+
+## C
+
+```java
+package app;
+
+public class App {
+    public static void main(String[] args){
+        println("Hello World");
+    }
+}
+```
+
+## D
+
+```java
+package app;
+import stdout
+
+public class App {
+    public int main(){
+        print("Hello World\n");
+        return 0;
+    }
+}
+
+```
+