Test: Arrays - 1 - EmSAT Achieve MCQ

An array in Java is a container object that holds a fixed number of elements of the same type.

In Java, arrays have a fixed size that is determined at the time of declaration and cannot be changed.

The index range of an array with size N in Java is from 0 to N-1.

Array elements can be accessed using their index, which is a numeric value indicating the position of the element in the array.

In Java, multidimensional arrays can have different lengths for each dimension, allowing you to create irregular or jagged arrays.

The code creates an array of integers and initializes it with values 1, 2, 3, 4, and 5. The line 'System.out.println(numbers[3]);' prints the value at index 3 of the array, which is 4.

The code creates an array of integers with a size of 5. Since the array is not explicitly initialized, the default value for integers (0) is assigned to each element. The line 'System.out.println(values[2]);' prints the value at index 2 of the array, which is 0.

The code creates an array of integers with a size of 3 using the new keyword. The line 'System.out.println(numbers.length);' prints the length of the array, which is 3.

The code creates an array of integers and initializes it with values 1, 2, 3, 4, and 5. The line 'System.out.println(numbers[numbers.length - 1]);' prints the value at the last index of the array, which is 5.

The code creates a 2-dimensional array called 'matrix' with three rows and three columns. The line 'System.out.println(matrix[1][2]);' accesses the element at the second row and third column of the array, which is 6.

The code calculates the sum of all the elements in the 'numbers' array using a loop. The sum starts with 0 and accumulates the values of each element in the array. The final sum is printed, which is 15.

The code finds the maximum value in the 'array' by comparing each element with the current maximum. The variable 'max' is initialized with the first element of the array, and the loop iterates through the remaining elements, updating max if a larger value is found. The final maximum value is printed, which is 5.

The code searches for the index of the 'target' value in the 'array'. It starts with an initial index of -1 and iterates through the array, checking if each element is equal to the target value. If a match is found, the index is updated and the loop breaks. The final index is printed, which is 2.

The code checks if the 'target' value exists in the 'array' by iterating through each element and comparing it to the target. If a match is 'found', the variable found is set to true, and the loop breaks. If no match is found, 'found' remains false. The value of 'found' is printed, which is false.

The code counts the number of even numbers in the 'array'. It initializes a counter variable 'count' with 0 and iterates through each element of the array. If an element is divisible by 2 (i.e., even), the counter is incremented. The final count is printed, which is 2.