- Aweakly typed
- Bstrogly typed
- Cmoderate typed
- D None of these
Java Language Fundamental - Quiz
- Aint [] myList = {"1", "2", "3"};
- Bint [] myList = (5, 8, 2);
- Cint myList [] [] = {4,9,7,0};
- Dint myList [] = {4, 3, 7};
- Aclass, if, void, long, Int, continue
- Bgoto, instanceof, native, finally, default, throws
- Ctry, virtual, throw, final, volatile, transient
- D strictfp, constant, super, implements, do
- A1, 2, 4
- B2, 4, 5
- C2, 3, 4
- DAll are correct.
- Apublic double methoda();
- Bpublic final double methoda();
- Cstatic void methoda(double d1);
- Dprotected void methoda(double d1);
- A16 bit
- B32 bit
- C64 bit
- DDepends on execution environment
- Avoid
- BA class object in which it is defined.
- CThere is no return type.
- DNone of the above
- ANo, Multiple exceptions cannot be handled in a single block
- BYes, likeexcept [ NameError, SyntaxError, ...]
- CYes, likeexcept NameError, SyntaxError, …
- DYes, likeexcept ( NameError, SyntaxError, ...)
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Java Language Fundamental - Quiz
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- A. weakly typed
- B. strogly typed
- C. moderate typed
- D. None of these
Remarks:
Explanation:
Java is a strongly typed language. This means that the type of a variable is known at compile time and once a variable is declared with a certain type, it cannot be assigned a value of a different type without an explicit cast.
- A. int [] myList = {"1", "2", "3"};
- B. int [] myList = (5, 8, 2);
- C. int myList [] [] = {4,9,7,0};
- D. int myList [] = {4, 3, 7};
Remarks:
Explanation:
The only legal array declaration and assignment statement is Option D
Option A is wrong because it initializes an int array with String literals.
Option B is wrong because it use something other than curly braces for the initialization.
Option C is wrong because it provides initial values for only one dimension, although the declared array is a two-dimensional array.
- A. class, if, void, long, Int, continue
- B. goto, instanceof, native, finally, default, throws
- C. try, virtual, throw, final, volatile, transient
- D. strictfp, constant, super, implements, do
Remarks:
Explanation:
All the words in option B are among the 49 Java keywords. Although goto reserved as a keyword in Java, goto is not used and has no function.
Option A is wrong because the keyword for the primitive int starts with a lowercase i.
Option C is wrong because "virtual" is a keyword in C++, but not Java.
Option D is wrong because "constant" is not a keyword. Constants in Java are marked static and final.
Option E is wrong because "include" is a keyword in C, but not in Java.
- A. 1, 2, 3, 4
- B. 1, 3, 4, 5
- C. 2, 4, 5, 6
- D. 3, 4, 5, 6
Remarks:
Explanation:
(1), (3), (4), (5) are the correct statements.
(2) is wrong because the default value for a String (and any other object reference) is null, with no quotes.
(6) is wrong because the default value for boolean elements is false.
- A. 1, 2, 4
- B. 2, 4, 5
- C. 2, 3, 4
- D. All are correct.
Remarks:
Explanation:
(1), (2), and (4) are legal array declarations. With an array declaration, you can place the brackets to the right or left of the identifier. Option A looks strange, but it's perfectly legal to split the brackets in a multidimensional array, and place them on both sides of the identifier. Although coding this way would only annoy your fellow programmers, for the exam, you need to know it's legal.
(3) and (5) are wrong because you can't declare an array with a size. The size is only needed when the array is actually instantiated (and the JVM needs to know how much space to allocate for the array, based on the type of array and the size).
- A. public double methoda();
- B. public final double methoda();
- C. static void methoda(double d1);
- D. protected void methoda(double d1);
Remarks:
Explanation:
Option A is correct. A public access modifier is acceptable. The method prototypes in an interface are all abstract by virtue of their declaration, and should not be declared abstract.
Option B is wrong. The final modifier means that this method cannot be constructed in a subclass. A finalmethod cannot be abstract.
Option C is wrong. static is concerned with the class and not an instance.
Option D is wrong. protected is not permitted when declaring a method of an interface. See information below.
Member declarations in an interface disallow the use of some declaration modifiers; you cannot use transient, volatile, or synchronized in a member declaration in an interface. Also, you may not use the private and protected specifiers when declaring members of an interface.
- A. 16 bit
- B. 32 bit
- C. 64 bit
- D. Depends on execution environment
Remarks:
Explanation: 32 bit
- A. void
- B. A class object in which it is defined.
- C. There is no return type.
- D. None of the above
Remarks:
Explanation: A class object in which it is defined.
- A. 2
- B. 4
- C. 10
- D. 8
Remarks:
Explanation: There are 8 types of primitive data types- int, char, boolean, byte, long, float, short, double.
- A. No, Multiple exceptions cannot be handled in a single block
- B. Yes, likeexcept [ NameError, SyntaxError, ...]
- C. Yes, likeexcept NameError, SyntaxError, …
- D. Yes, likeexcept ( NameError, SyntaxError, ...)
Remarks:
Explanation:
Yes, like
<span class="pln"> </span><span class="kwd">except</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> </span><span class="typ">NameError</span><span class="pun">,</span><span class="pln"> </span><span class="typ">SyntaxError</span><span class="pun">,</span><span class="pln"> </span><span class="pun">...)</span>