请问以下程序的输出是：
NonEnumClass.java:
public class NonEnumClass { private static NonEnumClass s_instance = new NonEnumClass(); private int b; private NonEnumClass() { b = 3; System.out.print( EnumClass.A ); } public static NonEnumClass getInstance(){ return s_instance; } public int getB(){ return b; } public static void main(String[] arg){ System.out.print(“C”); } } EnumClass.java:
public enum EnumClass { A; private EnumClass(){ System.out.print(NonEnumClass.getInstance().getB()); } } 运行: NonEnumClass
征服畏惧、建立自信的最快最确实的方法，
