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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?()
- A、 Compilation fails.
- B、 hello from a
- C、 hello from b
- D、 hello from b hello from a
- E、 hello from a hello from b
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更多 “ 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?() A、 Compilation fails.B、 hello from aC、 hello from bD、 hello from b hello from aE、 hello from a hello from b” 相关考题
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Compilation fails.B
hello from aC
hello from bD
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单选题class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()A
Just after line 13.B
Just after line 14.C
Just after line 15.D
Just after line 16 (that is, as the method returns).
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