Java Data Types and Variables - MCQ - Quiz

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.$7);
            System.out.println(test.do);
            System.out.println(test._$);
      }
}

  • A 7 9 0
  • B Compile error - $7 is not valid identifier.
  • C 7 0 0
  • D Compile error - do is not valid identifier.

Which of the following is not a primitive data type?
  • A int
  • B short
  • C byte
  • D enum

Compiler never assigns a default value to an uninitialized local variable in Java Programming !!
  • A True Statement
  • B False Statement

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);
      }
}

  • A 2
  • B 0
  • C 3
  • D 2.5

Which of the following is data type stores longest ______________ floating point number.
  • A double
  • B long
  • C boolean
  • D float

is used to construct the __________ . 
public Boolean (boolean value)

  • A None of these
  • B Boolean Object
  • C Floating Object
  • D Integer Object

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. }

  • A 128
  • B 0
  • C Compilation fails with an error at line 3
  • D None of these

Integer Data type does not include following primitive data type ____________.
  • A double
  • B long
  • C short
  • D byte

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 ) ;

  • A Does not compile as Integer and String are API class names.
  • B Throws exception.
  • C 34
  • D 34 S