0312 --- HELLO WORD

1. http://taiwantc.com/js/js_tut_a1.htm
2.下載練習程式碼http://www.oracle.com/technetwork/java/javase/downloads/index.html

3.儲存HelloWorldApp.txt
 變更附檔名為 HelloWorldApp.java

/**
 * 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.
    }
}

4.開啟 cmd
5.java
6.javac
7.cd c:\myjava
8.dir
9.javac HelloWorldApp.java
10.java HelloWorldApp

11. 執行顯示 hello World!