Question 1 of 25
Hints left: 3
Q1
What will be the output of the following Java code? class array_output { public static void main(String args[]) { int array_variable [] = new int[10]; for (int i = 0; i < 10; ++i) { array_variable[i] = i; System.out.print(array_variable[i] + " "); i++; } } }
Q2
Which of the following methods is used to compare two strings for equality in Java?
Q3
What is the purpose of the charAt() method of a String object in Java?
Q4
What will be the output of the following Java code? class array_output { public static void main(String args[]) { char array_variable [] = new char[10]; for (int i = 0; i < 10; ++i) { array_variable[i] = 'i'; System.out.print(array_variable[i] + ""); } } }
Q5
What is the correct way to check if a string starts with a specific prefix in Java?
Q6
What does the length() method of a String object in Java return?
Q7
What will be the output of the following Java code? class evaluate { public static void main(String args[]) { int arr[] = new int[] {0 , 1, 2, 3, 4, 5, 6, 7, 8, 9}; int n = 6; n = arr[arr[n] / 2]; System.out.println(arr[n] / 2); } }
Q8
Which of these operators is used to allocate memory to array variable in Java?
Q9
Which method is used to find the index of the first occurrence of a specified character in a string in Java?
Q10
What will be the output of the following Java code? class multidimention_array { public static void main(String args[]) { int arr[][] = new int[3][]; arr[0] = new int[1]; arr[1] = new int[2]; arr[2] = new int[3]; int sum = 0; for (int i = 0; i < 3; ++i) for (int j = 0; j < i + 1; ++j) arr[i][j] = j + 1; for (int i = 0; i < 3; ++i) for (int j = 0; j < i + 1; ++j) sum + = arr[i][j]; System.out.print(sum); } }
Q11
What is the correct way to create a new empty String object in Java?
Q12
What will be the output of the following Java code? class array_output { public static void main(String args[]) { int array_variable[][] = {{ 1, 2, 3}, { 4 , 5, 6}, { 7, 8, 9}}; int sum = 0; for (int i = 0; i < 3; ++i) for (int j = 0; j < 3 ; ++j) sum = sum + array_variable[i][j]; System.out.print(sum / 5); } }
Q13
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];
Q14
Which of these is an incorrect array declaration?
Q15
Which of these is an incorrect Statement?
Q16
In Java, which class is used to represent a sequence of characters as a string?
Q17
Which of the following is true about Java strings?
Q18
What is the purpose of the trim() method of a String object in Java?
Q19
In Java, which operator is used to concatenate two strings?
Q20
How do you convert a string to lowercase in Java?
Q21
Which of these is necessary to specify at time of array initialization?
Q22
Which of the following methods is used to replace all occurrences of a specified character in a string in Java?
Q23
In Java, what is the result of the expression "Hello".substring(1, 4)?
Q24
Predict the output: public class Test{ public static void main(String... args){ int[] index = new int[5]; System.out.println(index instanceof Object); } }
Q25
What will be the output of the following Java code? int arr[] = new int [5]; System.out.print(arr);