第六十五道Java小问题

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