单项选择题
A. Compilation fails.
B. An instance of the Inner class can be constructed with “new Outer.Inner()”.
C. An instance of the Inner class cannot be constructed outside of package foo.
D. An instance of the Inner class can be constructed only from within the Outer class.
E. From within the package foo, and instance of the Inner class can be constructed with “new Inner()”.
单项选择题 class A { public A() { System.out.println(“hello from a”); } } class B extends A { public B () { System.out.println(“hello from b”); super(); } } public class Test { public static void main(String args[]) { A a = new B(); } } What is the result when main is executed?()
多项选择题 Whichtwoarebenefitsoffullyencapsulatingaclass?()
单项选择题 class A { public byte getNumber() { return 1; } } class B extends A { public short getNumber() { return 2; } public static void main(String args[]) { B b = new B(); System.out.println(b.getNumber()); } } What is the result?()