java，

java，

public class    Exam2_2
    { public static void main(String args[])
      {   
          private final int      N=15;
          private final double PI=3.14;
         private final boolean B=false;
          private final char CH='a';
          private final String S="string" ;
          System.out.println("int:"+N);
          System.out.println("double;"+PI);
          System.out.println("char:"+CH );
         System.out.println("boolean:"+B);
          System.out.println("string:"+s);
         }
  总说是非法表达式的开始，不晓得是什么意思啊！！！

求解.........

谢谢