1, You can assign ________ to a variable of Object[] type. new char[100] new int
ID: 3909151 • Letter: 1
Question
1, You can assign ________ to a variable of Object[] type.
new char[100]
new int[100]
new double[100]
new String[100]
new java.util.Date[100]
2, Every object is an instance of the Object class.
true
false
3, Given the following classes and their objects:
class C1 {};
class C2 extends C1 {};
class C3 extends C1 {};
C2 c2 = new C2();
C3 c3 = new C3();
Analyze the following statement:
c2 = (C2)((C1)c3);
c3 is cast into c2 successfully.
You will get a runtime error because you cannot cast objects from sibling classes.
You will get a runtime error because the Java runtime system cannot perform multiple casting in nested form.
The statement is correct.
4, The UML uses ________ before a member name to indicate that the member is private.
+
-
#
?
Explanation / Answer
1. new String[100] 2. true 3. You will get a runtime error because you cannot cast objects from sibling classes. 4. -
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