Java Fundamentals Test
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Hi
- 1.Choose the operations that can be performed on String objects: (A) + (B) + = (C) - (D) % (E) ^
- A.
(A)
- B.
(D)
- C.
(A) and (B)
- D.
(D) and (E)
- E.
None of the above
- 2.Which three are valid declarations of a float? 1. float f1 = -343; 2. float f2 = 3.14; 3. float f3 = 0x12345; 4. float f4 = 42e7; 5. float f5 = 2001.0D; float f6 = 2.81F;
- A.
1,2,4
- B.
1,3,6
- C.
2,3,4
- D.
2,5,6
- 3.What is the numerical range of a char?
- A.
-128 to 127
- B.
-232 to -231
- C.
0 to 32767
- D.
0 to 65535
- 4.Which one of these lists contains only Java programming language keywords?
- 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
- E.
Byte, break, assert, switch, include
- 5.Which is a valid keyword in java?
- A.
Interface
- B.
String
- C.
Float
- D.
Unsigned
- 6.Which is a reserved word in the Java programming language?
- A.
Method
- B.
Native
- C.
Subclasses
- D.
Reference
- E.
Array
- 7.
- A.
Char c1 = 064770;
- B.
Char c2 = 'face';
- C.
Char c3 = 0xbeef;
- D.
Char c4 = \u0022;
- E.
Char c5 = '\iface';
- F.
Char c6 = '\uface';
- 8.
- A.
-2147483648 and 1
- B.
0x80000000 and 0x00000001
- C.
-2147483648 and -1
- D.
1 and -2147483648
- 9.String is a primitive datatype
- A.
True
- B.
False
- 10.The operations y >> 3 and y >>> 3 produce the same result when y > 0.
- A.
True
- B.
False
- 11.What will be the output of the program? class SSBool { public static void main(String [] args) { boolean b1 = true; boolean b2 = false; boolean b3 = true; if ( b1 & b2 | b2 & b3 | b2 ) /* Line 8 */ System.out.print("ok "); if ( b1 & b2 | b2 & b3 | b2 | b1 ) /*Line 10*/ System.out.println("dokey"); } }
- A.
Ok
- B.
Dokey
- C.
Ok dokey
- D.
Compilatioon error
- 12.The expression (y >= z && a == b) is evaluated by first evaluating the expression y >= z, and then evaluating a == b.
- A.
True
- B.
False
- 13.Which statements about the output of the following program are true? public class EqualTest { public static void main(String args[]) { String s1 = “YES”; String s2 = “YES”; if ( s1 == s2 ) System.out.println(“equal”); String s3 = new String(“YES”); String s4 = new String(“YES”); if ( s3 == s4 ) System.out.println(“s3 eq s4”); } }
- A.
“equal” is printed, “s3 eq s4” is printed.
- B.
“equal” is printed only.
- C.
“s3 eq s4” is printed only.
- D.
Nothing is printed.
- 14.What is the difference between >> and >>>?
- A.
The >> operator shifts left and the >>> operator shifts right.
- B.
The >> operator shifts right and the >>> operator shifts left.
- C.
The >> operator fills the shifted out high order bits based on the sign bit and the >>> operator fills the high order bits with zeros.
- D.
The >>> operator fills the shifted out high order bits based on the sign bit and the >>> operator fills the high order bits with zeros.
- 15.Null is a keyword in java
- A.
True
- B.
False
- 16.Which of the following are Java modifiers?
- A.
Public
- B.
Private
- C.
Transient
- D.
Friendly
- E.
Vagrant
- 17.Given the following variables which of the following lines will compile without error? String s = "Hello"; long l = 99; double d = 1.11; int i = 1; int j = 0; Choose 2
- A.
J=i
- B.
J=i
- C.
J=i
- D.
J=i
- 18.What will be output by the following line? System.out.println(Math.floor(-2.1));
- A.
-2
- B.
2.0
- C.
-3
- D.
-3.0
- 19.What will be output by the following line of code? System.out.println(010|4);
- A.
14
- B.
0
- C.
6
- D.
12
- 20.Which of the following has highest operator precedence
- A.
++
- B.
?:
- C.
- D.
&&
- E.
=
- 21.Given the following variables char c = 'c'; int i = 10; double d = 10; long l = 1; String s = "Hello"; Which of the following will compile without error?
- A.
C=c+i;
- B.
S+=i;
- C.
I+=s;
- D.
C+=s;
- 22.
- A.
True
- B.
False
- 23.Default value of the bolean is false
- A.
True
- B.
False
- 24.Extended assignment operators (for example +=) do an implicit cast. byte b = 10; b += 10;
- A.
True
- B.
False
- 25.Which of the following are legal identifiers. Choose all that apply
- A.
2variable
- B.
Variable2
- C.
_whatavariable
- D.
_3_
- E.
$anothervar
- F.
#myvar
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