Tag: programming languages

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Questions Related to programming languages

Multiple choice technology programming languages

Which program will give correct output :

  1. class cons{ cons() { } public void cons(); public static void main (String[] aa){ cons b=new cons(); } }

  2. public class cons { cons() { } public cons(int x,int y) { System.out.print(x +" "+ y); } public static void main (String[] aa){ cons b=new cons(); cons obj=new cons(4,2); } }

  3. public class cons { public cons(int x) { System.out.print(x); } public static void main (String[] aa){ cons b=new cons(); } }

  4. class cons{ cons() { } public float foo () { double f = 32; return f; } public static void main (String[] aa){ cons b=new cons(); } }
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology programming languages

What is the output of the following code when compiled and run? Select two correct answers. public class TechnoSample { public static void main(String[] args){ for(int i = 0; i <> System.out.println(getPrimitive(127)); //line 1 } } public static int getPrimitive(byte b) { //line 2 return (short)(Math.random()*b); //line 3 } }

  1. Compilation error on line 1

  2. Compilation error on line 2

  3. Compilation error on line 3

  4. Line 3 compiles fine

  5. Prints 10 random numbers between 0 and 127
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Full explanation
Multiple choice technology programming languages

Select three correct statements about the following code :-- public class TechnoSample { public static void main(String[] args) { TechnoSample myref = new TechnoSampleSub(); try{ myref.test(); } catch(Exception e){} } void test() throws Exception{ System.out.println("In TechnoSample"); throw new Exception(); } } class TechnoSample Sub extends TechnoSample { void test() { System.out.println("In TechnoSampleSub"); } }

  1. The try-catch block that encloses myref.test(); is mandatory for the code to compile

  2. Prints: In TechnoSample

  3. Prints: In TechnoSampleSub

  4. Method test() in class TechnoSampleSub has no obligation to declare a throws clause

  5. An exception is thrown at runtime
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Full explanation
Multiple choice technology programming languages

What will be output for the following program? public class Boxing2 { public static void main(String[] args) { byte b = 10; method(b); } static void method(int i){ System.out.println("Primitivae Type call"); } static void method(Integer i){ System.out.println("Wrapper Type Call"); } }

  1. Wrapper Type Call

  2. Primitive Type Call

  3. Compiler Error

  4. Compiles fine, throws runtime exception
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology programming languages

What will be the output of the following program? package wrapper_boxing; public class WrapperTest2 { public static void main(String[] args) { Boolean bool1 = new Boolean(true); Boolean bool2 = new Boolean(false); Boolean bool3 = new Boolean("false"); Boolean bool4 = new Boolean(bool1); System.out.println(bool1.equals(bool4)); System.out.println(bool2 == bool3); System.out.println(bool1 == bool4); } }

  1. The program will not compile because the creation of bool4 object will cause compilation error.

  2. The program will produce the output 'true false false'.

  3. The program will produce the output 'true true true'.

  4. The program will output 'true false true'.
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology programming languages

What will be the output of the following program? public class Ques09 { public static void main(String[] args) { Integer a = null; a = new Integer(10); int b = 20; a = b; a = 30; System.out.println(a++); short s = 100; a = s; System.out.println(a--); } }

  1. The program won't compile.

  2. The program will throw a run-time exception.

  3. The program will output '31 100'

  4. The program will output '31 99'
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation
Multiple choice technology programming languages

What will be the output of the following program? import java.io.ByteArrayInputStream; import java.io.InputStream; public class Ques04 { public static void main(String[] args) throws Exception{ byte buffer[] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'}; InputStream inputStream = new ByteArrayInputStream(buffer); inputStream.read();inputStream.read(); inputStream.skip(4); System.out.println((char)inputStream.read()); } }

  1. The program will raise a run-time exception telling that it is not possible to skip bytes in the middle of a reading operation.

  2. The program will output 'd'.

  3. The program will output 'e'.

  4. The program will output 'g'.
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation