第六十四道Java小问题

请问以下程序的输出是：

NonEnumClass.java

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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());}}

?

运行 NonEnumClass