JAVA MYECLIPSE BASE KNOWLEGE

package cn.itcast.eclipse;

public class demo1 {

/**HYPNUM:5
* HYP001--TO CONFIG THE JAVA JRE AND JAVA COMPILER COMPILANCE LEVEL MANNUALLY AND FLEXSIBLY..
* CURRENT DEVELOP ENVIRONMENT(MYECLIPSE6.6) COMES WITH DEFAULT 1.5 COMPILER AND DEFAULT 1.5 JRE;
* THIS PROJECT IS COMPILED IN THE DEFAULT SETTINGS,SO IF I NOW CHANGE IT INTO
* VERSION 6 IN COMPILER ON THE PROPERTIES OF PROJECTS(PROJECT'S PROPERTIES>JAVA COMPILER>ENABLE PROJECT SPECIFIC SETTINGS).
* WHEN COMPILING IT, YOU WILL SEE ERROR MESSAGES LIKE THIS,I CODE IT INTO MYNAME WITH NUMERICS.
* JUST REMEMBER PLEASE...
* HAOYP ERROR MESSAGE00001:
*  TITLE:JAVA VISUTAL MACHINE LAUNCHER(JVM)
*  CONTENT:COULD NOT FIND THE MAIN CLASS.PROGRAM WILL EXIT.
*  ERROR:Bad version number in .class file
*  (PROJECT>PROPERTIES>JAVA COMPILER)
*  LITTLE SUMMARIES:IF JRE AND JAVA COMPILER COMPILANCE LEVEL DO NOT MATCH,TO SEE ONE THING,
*  JAVA COMPILER COMPILANCE LEVEL MUST BE L0WER THAN JDK,THEN IT WILL COMPILE CORRECTLY.....IT IS A MUST TO BE OK IN EVERY ASPECTS.
*  IF NOT THEN, JUST TWO WAYS TO SOLVE...
*  OR YOU MAY High THE JRE,OR YOU MAY Low THE JAVA COMPILER COMPILIANCE LEVEL ...
* 
*  WHEN MATCH,EVERYTHING WORKS...
*  REALLY BEAUTIFUL JAVA CODE AND CHARACTERRISTICS...
*  IT IS FLEXSIBLE..^^
* 
* HYP002--TO S WITCH BETWEEN TEXT FILE ENCODING WAYS...MENTION ABOUT UTF-8
*  你好,中文环境的一个小小的测试。
* IF I COMMENT in CHINESE,ERROR OCCURS..
* IT CAN NOT BE SAVED ABSOLUTELY..WHEN SAVING IT,ERROR GOES LIKE BELOW
* HYP ERROR MESSAGE00002:
* TITLE:SAVE PROBLEM
     * CONTENT:
     *  REASON:
     *  SOME CHARACTERS CANNOT BE MAPPED USING "Cp1252" character encoding.
     *  Either change the encoding or remove the characters which are not
     *  supported by the "Cp1252" character encoding.
     *
* FOR THE REASON OF THE DEFAULT ENCODING METHOD OF MYECLIPSE.
* IT IS CP1252...
* JUST CHANGE IT INTO UTF-8 ,THEN CHINESE COMMENTS WORKS CORRECTLY...
* (WINDOW>PREFENRENCES>GENERAL>WORKSPACE>TEXT FILE ENCODING)
*
*
* HYP003--TO CORRECTLY SEE ABOUT THE VARY IN JAVA COMPILER COMPILANCE LEVEL ...
* SOMETHING MORE ABOUT JAVA COMPILER COMPILANCE LEVEL...
* WHEN YOU CLICK ON THE DROPDOWN CONTROL ,YOU WILL SEE THE CURRENTLY SUPPORTED JAVA COMPILER COMPILANCE LEVEL...
* THEY ARE 1.3,1.4,5.0,6.0 IN MYECLIPSE 6.6....
* BUT WHY DOES THE COMPILER COMPILANCE LEVEL CHANGE
* FROM 1.3,1.4 FORMAT TO 5.0,6.0 ETC?
* IS 5.0 COMPATIBLE WITH JDK 1.5?
* THE ANSWER IS YES...AND MORE IS THAT BELOW:
* JDK 1.5 is Java 5.0. Sun likes to do that. They pulled the same trick with Solaris.
* ALSO,AS 1.5 MAKES VERY GREATE CHANGES FROM THE FORMAR,SO,TO MENTION ABOUT IT ,SUN CALLS IT 5.0 IN THE NAME.
* MEANS TO BE DIFFERENT,TO BE MUCH MORE POWERFUL.
*
*
* HYP004--DEBUG SKILLS USING IS VERY IMPORTANT,AND ALSO WILL BE ONE HAPPY HABIT IFF YOU MAKE...
* WHAT IS BREAKPOINTS DEBUG...WANT TO DEBUG,MUST BE A BREAKPOINT FIRST..SO WITHOUT BREAKPOINT,WITHOUT DEBUG...
* DEBUG BEGINS WITH BREAKPOINT.
* In delphi,also COMES WITH this..step into,step over,step return..but i never used about it.it is REALLY A PITY.
* DO NOT KNOW ABOUT THE POWER OF DEBUG SKILLS,THAT IS A REAL LOS..
* SO FROM HERE,I BEGIN TO KNOW:FROM DIFFERENT LANGUAGES,TO LEARN DIFFERENT EXECUTENT SKILLS...

* BREAKPOINTS VIEW NEED TO KNOW FIVE POINTS:
* F5--STEP INTO.   EQUATE "CTRL+ MOUSE SINGLE CLICK" IN DELPHI.
* F6--STEP OVER.  
* F7--STEP RETURN.
* RESUME AND DROP TO FRAME ,IS QUIT BEAUTIES.
* EXPRESSIONS VIEW NEED TO KNOW ONE POINT:
* WATCH IS A UTILITY...
* TO SEE THE VALUE OF VAR OR EXPRESSIONS.
* IN COMPARISON WITH DELPHI,WHAT IS THAT?
* USE ALL THESE SKILLS TO DELPHI IDE.THAT IS ANOTHER IMPORTANT TIP.
*
* BREAKPOINTS DEBUG ATTENTIONS:
* A>AFTER DEBUGGING WHENEVER,REMEMBER TO CLEAR ALL THE BREAKPOINTS,WHICH KEEPS THAT YOU GO TO THE NORMAL JAVA ENVIRONMENT,EVERYTHING WILL NOT
* GOES ERROR.
* B>Remember to CLOSE THE BACKGROUND WORKING JVM ,WHEN YOU ARE READY TO SWITH TO MYECLIPSE JAVA ENTERPRISE..\
* THIS KEEPS YOU AVOIDING MEETING WITH MUCH MORE ERRORS...REMEMBER PLEASE.
*
* HYP005--FROM THE VIDEO,ONE TIP IS IMPRESSED IN MY MIND...WHAT IS THE REAL REASON AND HOW TO SOLVE IT?
* THE TEACHER SAYS NOT TO INCLUDE space IN THE WORKSPACE PATH,AND NOT INCLUDE CHINESE IN THE  WORKSPACE,
* WHY?AND IF I HAVE TO,HOW TO SLOVE IT,THIS WILL BE SOLVED LATTER FROM LEANING...
*
*/
public static void main(String[] args) {

      System.out.println("hello.java myeclipse!!!");
}

}