hello word!!

1.複製以下程式碼 貼在一個新WordPad檔

/**
 * The HelloWorldApp class implements an application that
 * simply prints "Hello World!" to standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // Display the string.
    }
}

2.儲存檔名命為"HelloWorldApp.java"
3.使用命令提示字元作Java編譯如下圖即成功