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    ....
   A a = new A();  
   if(true) return; 
   a.setXXProper("hello");
   .....

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   try{
      .... 
       ..
   }
   catch(Exception e){
       out.println("debug資訊:"+e.getMessage();
   }

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    /*
    for(i=0;i<max;i++){
       //for loop statement...
    }*/

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    if(false)
    for(i=0;i<max;i++){
       //for loop statement...
    }