Java Data Types and Variables(1st)

Which of the following automatic type conversion will be possible?

1 Mark(s)

short to int
int to long
byte to int
long to int

The following program:

public class Test{ 
        static boolean isOK;
        public static void main(String args[]){
                System.out.print(isOK);
        } 
}

The following program:

public class Test{ 
        static boolean isOK;
        public static void main(String args[]){
                System.out.print(isOK);
        } 
}

1 Mark(s)

Will not compile as boolean is not initialized
Prints true
Will not compile as boolean can never be static
Prints false

Automatic type conversion in Java takes place when

1 Mark(s)

Two type are compatible and size of destination type is equal of source type.
Two type are compatible and size of destination type is shorter than source type.
All of the above
Two type are compatible and size of destination type is larger than source type.

What is the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             byte b = 6;
4.             b+=8;
5.             System.out.println(b);
6.             b = b+7;
7.             System.out.println(b);
8.       }
9. }

What is the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             byte b = 6;
4.             b+=8;
5.             System.out.println(b);
6.             b = b+7;
7.             System.out.println(b);
8.       }
9. }

1 Mark(s)

None of these
Compilation fails with an error at line 4
14 13
14 21
Compilation fails with an error at line 6

What will be the output for the below code ?

1. public class Test{
2.       int i=8;
3.       int j=9;
4.       public static void main(String[] args){
5.             add();
6.       }
7.       public static void add(){
8.             int k = i+j;
9.             System.out.println(k);
10.      }
11. }

What will be the output for the below code ?

1. public class Test{
2.       int i=8;
3.       int j=9;
4.       public static void main(String[] args){
5.             add();
6.       }
7.       public static void add(){
8.             int k = i+j;
9.             System.out.println(k);
10.      }
11. }

1 Mark(s)

Compilation fails with an error at line 5
17
0
None of these
Compilation fails with an error at line 8

What is the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             int i = 010;
4.             int j = 07;
5.             System.out.println(i);
6.             System.out.println(j);
7.       }
8. }

What is the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             int i = 010;
4.             int j = 07;
5.             System.out.println(i);
6.             System.out.println(j);
7.       }
8. }

1 Mark(s)

Compilation fails with an error at line 5
8 7
None of these
10 7
Compilation fails with an error at line 3

What will be output of following program?

public class Test{
      public static void main(String[] args){
            byte b=127;
            b++;
            b++;
            System.out.println(b);
      }
}

What will be output of following program?

public class Test{
      public static void main(String[] args){
            byte b=127;
            b++;
            b++;
            System.out.println(b);
      }
}

1 Mark(s)

129
2
Compiler error
None of these
-127

What will the output of the following program?

public class Test{
      public static void main(String args[]){
            float f = (1 / 4) * 10;
            int i = Math.round(f);
            System.out.println(i);
      }
}

What will the output of the following program?

public class Test{
      public static void main(String args[]){
            float f = (1 / 4) * 10;
            int i = Math.round(f);
            System.out.println(i);
      }
}

1 Mark(s)

Size of int in Java is

1 Mark(s)

64 bit
16 bit
Depends on execution environment
32 bit

In Java byte, short, int and long all of these are

1 Mark(s)

signed
Both of the above
None of these
unsigned

Size of float and double in Java is

1 Mark(s)

32 and 64
64 and 32
64 and 64
32 and 32

How many primitive data types are there in Java?

1 Mark(s)

Determine output:

public class Test {
        static void test(float x){
                System.out.print("float");
        }

        static void test(double x){
                System.out.print("double");
        }

        public static void main(String[] args){
                test(99.9);
        }
}

Determine output:

public class Test {
        static void test(float x){
                System.out.print("float");
        }

        static void test(double x){
                System.out.print("double");
        }

        public static void main(String[] args){
                test(99.9);
        }
}

1 Mark(s)

Compilation Error
Exception is thrown at runtime
float
double

What is the output for the below code ?

class A{
      int k;
      boolean istrue;
      static int p;
      public void printValue(){
            System.out.print(k);
            System.out.print(istrue);
            System.out.print(p);
      }
}

public class Test{
      public static void main(String argv[]){
            A a = new A();
            a.printValue();
      }
}

What is the output for the below code ?

class A{
      int k;
      boolean istrue;
      static int p;
      public void printValue(){
            System.out.print(k);
            System.out.print(istrue);
            System.out.print(p);
      }
}

public class Test{
      public static void main(String argv[]){
            A a = new A();
            a.printValue();
      }
}

1 Mark(s)

Compile error - static variable must be initialized before use.
0 0 0
0 true 0
0 false 0
None of these

What would be the output of the following fraction of code ?

int Integer = 34 ;
char String = 'S' ;
System.out.print( Integer ) ;
System.out.print( String ) ;

What would be the output of the following fraction of code ?

int Integer = 34 ;
char String = 'S' ;
System.out.print( Integer ) ;
System.out.print( String ) ;

1 Mark(s)

S
34
Does not compile as Integer and String are API class names.
34 S
Throws exception.

The smallest integer type is ......... and its size is ......... bits.

1 Mark(s)

short, 16
short, 16
short, 8
byte, 8

Java is a ........... language.

1 Mark(s)

moderate typed
strongly typed
None of these
weakly typed

In Java, the word true is ................

1 Mark(s)

A Java keyword
A Boolean literal
Same as value 1
Same as value 0

What is the output of the following program?

public class Test{
	static int x  = 10 ;
       	public static void main(String[] a){
		 Test test = new Test( ) ; 
		 Test test1 = new Test( ) ;
		 test.x  +=  1 ;
		 System.out.println(  test.x + test1.x ) ;    
	}
}

What is the output of the following program?

public class Test{
	static int x  = 10 ;
       	public static void main(String[] a){
		 Test test = new Test( ) ; 
		 Test test1 = new Test( ) ;
		 test.x  +=  1 ;
		 System.out.println(  test.x + test1.x ) ;    
	}
}

1 Mark(s)

Throws Exception
Compilation Error
21
20
22

What is the output for the below code?

public class Test{
      int _$;
      int $7;
      int do;

      public static void main(String argv[]){
            Test test = new Test();
            test.$7=7;
            test.do=9;
            System.out.println(test.$7);
            System.out.println(test.do);
            System.out.println(test._$);
      }
}

What is the output for the below code?

public class Test{
      int _$;
      int $7;
      int do;

      public static void main(String argv[]){
            Test test = new Test();
            test.$7=7;
            test.do=9;
            System.out.println(test.$7);
            System.out.println(test.do);
            System.out.println(test._$);
      }
}

1 Mark(s)

7 0 0
7 9 0
Compile error - $7 is not valid identifier.
Compile error - do is not valid identifier.
None of these

What will be output of the following program code?

public class Test{
	public static void main(String[] a){
		short x = 10;
		x = x*5;
		System.out.print(x);
	}  
}

What will be output of the following program code?

public class Test{
	public static void main(String[] a){
		short x = 10;
		x = x*5;
		System.out.print(x);
	}  
}

1 Mark(s)

50
None of these
10
Compilation Error

The following fraction of code

double STATIC = 2.5 ;
System.out.println( STATIC );

The following fraction of code

double STATIC = 2.5 ;
System.out.println( STATIC );

1 Mark(s)

None of these
Prints 2.5
Rraises an error as STATIC is used as a variable which is a keyword
Raises an exception

Determine output:

class A{
        public static void main(String args[]){
	        int x;
 	        x = 10;
	        if(x == 10){
		        int y = 20;
		        System.out.print("x and y: "+ x + " " + y);
		        y = x*2;
	        }
	        y = 100;
	        System.out.print("x and y: " + x + " " + y);
        }
}

Determine output:

class A{
        public static void main(String args[]){
	        int x;
 	        x = 10;
	        if(x == 10){
		        int y = 20;
		        System.out.print("x and y: "+ x + " " + y);
		        y = x*2;
	        }
	        y = 100;
	        System.out.print("x and y: " + x + " " + y);
        }
}

1 Mark(s)

10 20 10 100
Error
10 20 10 10
10 20 10 20

Determine output:

public class Test{
	int i = 34;
	public static void main(String args[]){
		Test t1 = new Test();
		Test t2 = new Test();
		t1.i = 65;
		System.out.print(t1.i);
		System.out.print(t2.i);
	}
}

Determine output:

public class Test{
	int i = 34;
	public static void main(String args[]){
		Test t1 = new Test();
		Test t2 = new Test();
		t1.i = 65;
		System.out.print(t1.i);
		System.out.print(t2.i);
	}
}

1 Mark(s)

65 34
65 65
34 34
34 65

What is the output of the following program?

class A{
        public static void main(String args[]){
	        byte b;
   	        int i = 258;
	        double d = 325.59;

	        b = (byte) i;
	        System.out.print(b);

	        i = (int) d;
	        System.out.print(i);

                b = (byte) d;
                System.out.print(b);
        }
}

What is the output of the following program?

class A{
        public static void main(String args[]){
	        byte b;
   	        int i = 258;
	        double d = 325.59;

	        b = (byte) i;
	        System.out.print(b);

	        i = (int) d;
	        System.out.print(i);

                b = (byte) d;
                System.out.print(b);
        }
}

1 Mark(s)

2 325 69
258 326 326
Error
258 325 325

What will be the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             byte i = 128;
4.             System.out.println(i);
5.       }
6. }

What will be the output for the below code ?

1. public class Test{
2.       public static void main(String[] args){
3.             byte i = 128;
4.             System.out.println(i);
5.       }
6. }

1 Mark(s)

0
None of these
Compilation fails with an error at line 3
Compilation fails with an error at line 4
128

Determine output:

public class Test{
      int a = 10;
    
      public void method(int a){
            a += 1;
            System.out.println(++a);
      }
      public static void main(String args[]){
            Test t = new Test();
            t.method(3);
      }
}

Determine output:

public class Test{
      int a = 10;
    
      public void method(int a){
            a += 1;
            System.out.println(++a);
      }
      public static void main(String args[]){
            Test t = new Test();
            t.method(3);
      }
}

1 Mark(s)

11
None of these
4
5
12

Java Data Types and Variables(1st) : Question 1 of 27