Java Programming Language

Array in Java

⛪ Programming Language > Java Programming Language

Test your knowledge of Java arrays with these multiple choice questions. Learn about the different types of arrays in Java and how to use them to store and manipulate data. Take the quiz now! ➲ Array in Java - Quiz

Q 1: In Java arrays are

  • A objects
  • B object references
  • C primitive data type
  • D None of the above

Q 2: Which one of the following is a valid statement?

  • A char[] c = new char();
  • B char[] c = new char[5];
  • C char[] c = new char(4);
  • D char[] c = new char[];

Q 3: What is the result of compiling and running the following code? 
public class Test{
        public static void main(String[] args){
                int[] a = new int[0];
                System.out.print(a.length);
        }
}

  • A 0
  • B Compilation error, arrays cannot be initialized to zero size.
  • C Compilation error, it is a.length() not a.length
  • D None of the above

Q 4: What will be the output? 
public class Test{
        public static void main(String[] args){
                int[] x = new int[3];
                System.out.println("x[0] is " + x[0]);
        }
}

  • A The program has a compile error because the size of the array wasn't specified when declaring the array.
  • B The program has a runtime error because the array elements are not initialized.
  • C The program runs fine and displays x[0] is 0.
  • D The program has a runtime error because the array element x[0] is not defined.

Q 5: What is output of the following code: 
public class Test{
        public static void main(String[] args){
                int[] x = {120, 200, 016 };
                for(int i = 0; i < x.length; i++)
                        System.out.print(x[i] + " ");
        }
}

  • A 120 200 16
  • B 120 200 14
  • C 120 200 016
  • D 016 is a compile error. It should be written as 16.

Q 6: Determine output: 
public class Test{
        public static void main(String[] args){
                int[] x = {1, 2, 3, 4};
                int[] y = x;

                x = new int[2];

                for(int i = 0; i < x.length; i++)
                        System.out.print(y[i] + " ");
        }
}

  • A 1 2 3 4
  • B 0 0 0 0
  • C 1 2
  • D 0 0

Q 7: Analyze the following code and choose the correct answer. 
int[] arr = new int[5];
arr = new int[6];

  • A The code has compile errors because the variable arr cannot be changed once it is assigned.
  • B The code has runtime errors because the variable arr cannot be changed once it is assigned.
  • C The code can compile and run fine. The second line assigns a new array to arr.
  • D The code has compile errors because we cannot assign a different size array to arr.

Q 8: What will be the output? 
public class Test{
        public static void main(String[] args){
                int[] a = new int[4];
                a[1] = 1;
                a = new int[2];
                System.out.println("a[1] is " + a[1]);
        }
}

  • A The program has a compile error because new int[2]
  • B The program has a runtime error because a[1]
  • C a[1] is 0
  • D a[1] is 1

Q 9: When you pass an array to a method, the method receives ________ .

  • A A copy of the array.
  • B A copy of the first element.
  • C The reference of the array.
  • D The length of the array.

Q 10: What is the value of a[1] after the following code is executed? 
int[] a = {0, 2, 4, 1, 3};
for(int i = 0; i < a.length; i++)
a[i] = a[(a[i] + 3) % a.length];

  • A 0
  • B 1
  • C 2
  • D 3

Q 11: What will be the output of the program? 
public class Test{
      public static void main(String [] args){
            String s1 = args[1];
            String s2 = args[2];
            String s3 = args[3];
            String s4 = args[4];
            System.out.print(" args[2] = " + s2);
      }
}
and the command-line invocation is C:Java> java Test 1 2 3 4

  • A args[2] = 2
  • B args[2] = 3
  • C args[2] = null
  • D An exception is thrown at runtime.

Q 12: Which will legally declare, construct, and initialize an array?

  • A int [] myList = {};
  • B int [] myList = (5, 8, 2);
  • C int myList [] [] = {4,9,7,0};
  • D int myList [] = {4, 3, 7};

Q 13: What would be the result of attempting to compile and run the following code? 
public class HelloWorld{
      public static void main(String[] args){
            double[] x = new double[]{1, 2, 3};
            System.out.println("Value is " + x[1]);
      }
}

  • A The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by {1, 2, 3}.
  • B The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[3]{1, 2, 3};
  • C The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[]{1.0, 2.0, 3.0};
  • D The program compiles and runs fine and the output

Q 14: Which of these operators is used to allocate memory to array variable in Java?

  • A malloc
  • B alloc
  • C new
  • D new malloc

Q 15: Which of the following is NOT true about Java arrays?

  • A Arrays can store only objects and not primitive types.
  • B Arrays have a fixed size.
  • C Arrays can be multidimensional.
  • D Elements of an array are accessed using an index.