Java Programming Questions and Answers

Showing 1 - 10 of 150 questions

What happens when the following program is compiled and run. Select the one correct answer.


public class example {
   int i[] = {0};
   public static void main(String args[]) {
      int i[] = {1};
      change_i(i);
      System.out.println(i[0]);
   }
   public static void change_i(int i[]) {
      int j[] = {2};
      i = j;
   }
}

The program does not compile.

prints 0

prints 1

prints 2

correct answer c

What happens when the following program is compiled and run. Select the one correct answer.


public class example {
   int i[] = {0};
   public static void main(String args[]) {
      int i[] = {1};
      change_i(i);
      System.out.println(i[0]);
   }
   public static void change_i(int i[]) {
      i[0] = 2;
      i[0] *= 2;
   }
}

prints 0

prints 2

prints 4

prints 3

correct answer c

What happens when the following program is compiled and executed with the command - java test. Select the one correct answer.


class test {
   public static void main(String args[]) {
      if(args.length > 0)
         System.out.println(args.length);
   }
}

The program compiles and runs but does not print anything.

the program compiles and runs and prints 0

the program compiles and runs and prints 1

the program compiles and runs and prints 2

correct answer a

Which of these are valid declarations for the main method?

public void main();

public static void main(String args[]);

public static void main(String );

public static int main(String args[]);

correct answer b

What would be the results of compiling and running the following class. Select the one correct answer.


class test {
   public static void main() {
      System.out.println("test");
   }
}

The program does not compile as there is no main method defined.

The program compiles and runs generating an output of "test"

The program compiles and runs but does not generate any output.

The program compiles but does not run.

correct answer d

The initial value of an instance variable of type String that is not explicitly initialized in the program is --. Select the one correct answer

null

NULL

correct answer a,d

The initial value of an local variable of type String that is not explicitly initialized in the program is --. Select the one correct answer

null

NULL

The local variable must be explicitly assigned

correct answer a,d

What is the minimum value of char type. Select the one correct answer.

-2¹⁵

-2¹⁵ - 1

-2¹⁶ - 1

correct answer a,d

How many bytes are used to represent the primitive data type int in Java.

correct answer b,d

What is the legal range of values for a variable declared as a byte

0 to 256

-128 to 127

-127 to 128

-2¹⁵ to 2¹⁵ - 1

correct answer b,d

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