003_ first JAVA program notes

summary:

1, and tell you how to develop a JAVA program

• The first step : the first to write our code, tools that notepad ++ (code: designated ANSI encoding, language: select JAVA)

• Step two : we want to use our JDK installed (in the bin directory: javac.exe) compile, compiled by the formation of the end of the .class suffix of a file with the same name

• The third step : we execute our JDK installed (in the bin directory: java.exe), were running our first HelloWorld applet

  the HelloWorld class {public
  public static void main (String [] args) {
  System.out.println ( "Java, Hello!");
  }
  }
  compiler: javac HelloWorld.java
  explained: java HelloWorld

2, when we write a small program to pay attention to some problems:

1. We must pay attention to the spelling of the word, for example, the main method (this is wrong: mian)
2. Note that writing code, pay attention to the brackets are paired children appear
3. Do not write any Chinese symbols in the code
4. There is a problem it does not matter, we must learn to view the error (small partners to find the problem in accordance with the line number prompt, read to your error message)