(1)
public class Literal {
public static void main(String[] args) {
String str$="world";
char str_='X';
String $_=str$+str_;
System.out.print($_);
}
}
What will output when you compile and run the above code?
(a)world
(b)worldX
(c)world’X’
(d)Compiler error
Answer: (b)
Explanation:
In
java programming language operator + can add two numeric data type as
well as it can concatenate two string or character data type.
Here $_=”world”+’X’ ,Operator + is working as concatenating one string and char data type.
Note:
$_ is valid variable name. In java programming language variable name
includes alphabet, digits few special characters like underscore (_),
dollar singe ($) but it should not be any reserved word of java
language.
Integer Literals
(2)
public class Literal {
public static void main(String[] args) {
int a=012;
int c=a*2;
System.out.print(c);
}
}
What will output when you compile and run the above code?
(a) 24
(b) 024
(c) 20
(d) Compiler error
Answer: (c)
(3)
public class Literal {
public static void main(String[] args) {
byte a=0110;
int c=a*2;
System.out.print(c);
}
}
What will output when you compile and run the above code?
(a)1100
(b)220
(c)144
(d) Java doesn’t support binary number.Compiler error
Answer: (c)
(4)
public class Literal {
public static void main(String[] args) {
byte a=08;
int c=a>>2;
System.out.print(c);
}
}
What will output when you compile and run the above code?
(a)32
(b)2
(c)02
(d) Compiler error
Answer: (d)
(5)
public class Literal {
public static void main(String[] args) {
byte a=0x11;
byte b=0X22;
int c=a&&b;
System.out.print(c);
}
}
What will output when you compile and run the above code?
(a)2
(b)0
(c)1
(d) Compiler error
Answer: (d)
(6) Numerical value of false in java is :
(a) 0
(b) All values except one
(c) zero and all negative integers
(d) java doesn’t support any numerical value of false
Answer: (d)
(7)
public class Literal {
public static void main(String[] args) {
boolean b =5==5;
int a=(int)b;
System.out.println(a);
}
}
What will output when you compile and run the above code?
(a)0
(b)1
(c)NaN
(d) Compiler error
Answer:(d)
(8) Which of the following is not valid java floating point literal?
(a) 4.5f
(b) .033D
(c) 5.0e^2
(d) 6.8
Answer: (c)
(9) Which of the following is a not valid java floating point literal?
(e) 8.09F
(f) .033f
(g) 5.0E25
(h) 6.8e^2
Answer: (h)
(10)
public class Scope {
public static void main(String[] args) {
int a=5;
{
a=10;
int b=15;
a=a+b;
}
System.out.println(a);
}
}
What will output when you compile and run the above code?
(a)5
(b)25
(c)Run time exception
(d) Compiler error
Answer: (b)
(11)
public class Scope {
public static void main(String[] args) {
{
static int a=5;
}
{
int a=10;
a=++a;
}
System.out.println(a);
}
}
What will output when you compile and run the above code?
(a)5
(b)21
(c)11
(d) Compiler error
Answer: (d)
(12)
public class Scope {
public static void main(String[] args) {
{
int a=5;
System.out.println(a);
}
int a=6;
a=~a;
System.out.println(a);
}
}
What will output when you compile and run the above code?
(a)5
-7
(b)5
-6
(c)Run time exception
(d) Compiler error
