Java Programming Questions and Answers

Showing 1 - 9 of 9 questions

What is the result of compiling and running the following class. Select the one correct answer.



class Test {

   public void methodA(int i) {

      System.out.println(i); 

   }

   public int methodA(int i) {

      System.out.println(i+1); 

      return i+1; 

   }

   public static void main(String args[]) {

      Test X = new Test();

      X.methodA(5);

   }

}

The program compiles and runs printing 5

The program compiles and runs printing 6

The program gives runtime exception because it does not find the method Test.methodA(int)

The program give compilation error because methodA is defined twice in class Test

correct answer d

Which of the following are valid constructors within a class Test

test() { }

Test() { }

Test(void) { }

void Test() { }

correct answer b

Which of the following are legal declaration and definition of a method.

void method() {}

void method(void) {}

method(void) {}

void method {}

correct answer a

What will the result of compiling and executing the following program. Select the one correct answer.

class Test {

    public static void main(String args[]) {

	int arr[] = new int[2];

	System.out.println(arr[0]);

    }

}

The program does not compile because arr[0] is being read before being initialized

The program generates a runtime exception because arr[0] is being read before being initialized

The program compiles and prints 0 when executed

The program compiles and prints 1 when executed

correct answer c

Which of these array declarations and initializations are legal?

int arr[4] = new int[4];

int[4] arr = new int[4];

int arr[] = new int[4][4];

int[] arr = new int[4];

correct answer d

Which of these statements is illegal.

int arr[][] = new int[5][5];

int []arr[] = new int[5][5];

int[][] arr = new int[5][5];

int[] arr = new int[5][];

correct answer d

Given a one dimensional array arr, what is the correct way of getting the number of elements in arr. Select the one correct answer

arr.length

arr.size

arr.length()

arr.length() - 1

correct answer a

Which of the following is syntactically wrong ?

A. int a;

B. int 1b;

C. int _a;

D. None of the above

correct answer b

Identifier can begin with a letter, a currency character ($) or underscore (_).

Which of the following is syntactically correct ?

A. int d2;

B. int emp;

C. int $student;

D. All of the above

correct answer