多项选择题
Given:
What are four valid examples of polymorphic method calls?()
A.x.a2();
B.z.a2();
C.z.c1();
D.z.a1();
E.y.c1();
F.x.a1();
相关考题
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单项选择题
Given: What is the result?()
A.peep
B.bark
C.meow
D.Compilation fails.
E.An exception is thrown at runtime. -
单项选择题
Given: Which change can you make to Target without affecting Client?()
A.Line 4 of class Target can be changed to return i++;
B.Line 2 of class Target can be changed to private int i = 1;
C.Line 3 of class Target can be changed to private int addOne(){
D.Line 2 of class Target can be changed to private Integer i = 0; -
单项选择题
Given a method that must ensure that its parameter is not null: 11. public void someMethod(Object value) { 12. // check for null value ... 20. System.out.println(value.getClass()); 21. } What inserted at line 12, is the appropriate way to handle a null value?()
A.assert value == null;
B.assert value != null, "value is null";
C.if (value == null) { throw new AssertionException("value is null"); }
D.if (value == null) { throw new IllegalArgumentException("value is null"); }
