Hello world in Java

原创于 2013-02-24 11:15:38 发布 · 522 阅读

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本文分享了一个简单的Java程序——Hello World。通过这个例子，介绍了Java中类的定义、main方法的正确用法以及如何避免常见的错误。对于初学者来说，这是一个很好的起点。

Hello everyone ! This is my first blog. The following is a hello world program in Java.

class hello {
      public static void main(String args[]) {
          System.out.println("hello world !");
      }
  }

Attention:

1) While you are writing this program, you should pass "String args[]" as the argument to the main method.

If you do not pass an array of String as an argument, it will cause this exception:

         Exception in thread "main" java.lang.NoSuchMethodError: main.

2) When you write a method , you'd better write the return type directly in front of the method name.

   public static void main() { ... }  // OK
   public void static main() { ... }  // error !