Data Structure and Algorithm Prelim and Premid Examination

What is an array in Java?

• An array in Java is a dynamic data structure that can change size.

• An array in Java is a type of object that can only hold a single value.

• An array in Java can store values of different types.

• An array in Java is a fixed-size data structure that stores multiple values of the same type.

How do you create an array in Java?

• You create an array in Java using 'arrayName = new type[size];'.

• Arrays in Java are created with 'type arrayName = new type[size];'.

• You create an array in Java using the syntax: 'type[] arrayName = new type[size];'.

• You can declare an array in Java with 'type arrayName[] = new type[size];'.

What symbol is used to access an element in an array?

• <>

• {}

• .

• []

How do you find the length of an array in Java?

• Use 'arrayName.size()' to find the length of an array in Java.

• Use 'arrayName.length' to find the length of an array in Java.

• Use 'lengthOf(arrayName)' to get the length of an array in Java.

• Call 'arrayName.getLength()' to determine the length of an array in Java.

What is the first index of an array?

• 1

• 0

• 5

• -1

How can you loop through an array using a for loop?

• for (let i = 0; i < array.length; i++) { print(array[i]); }

• for (let i = 1; i <= array.length; i++) { console.log(array[i]); }

• for (i = 0; i < array.length; i++) { console.log(i); }

• for (let i = 0; i < array.length; i++) { console.log(array[i]); }

What happens if you try to access an index that is out of bounds?

• The program continues without any issues.

• The index is automatically adjusted to the nearest valid index.

• An error or exception is raised.

• A warning message is displayed but no error occurs.

What is the syntax to declare an array of integers?

• int[] arrayName;

• int arrayName;

• int arrayName[];

• array int[] arrayName;

How do you assign a value to an array element?

• Set the element with arr[index] := value;

• Assign values using arr.value[index];

• Use the index and assignment operator, e.g., arr[index] = value;

• Use the value and index operator, e.g., arr[value] = index;

What method can you use to sort an array in Java?

• Arrays.sort()

• ArrayList.sort()

• Collections.sort()

• List.sort()