True or False

Question 1

Non-primitive data types can be used to call methods to perform operations, while primitive data types cannot.

Answer 1

True

Question 2

A primitive data type always has a value, while the value of non-primitive data type can be null.

Answer 2

True

Question 3

A primitive data type starts with a uppercase letter, while non-primitive data type starts with a lowercase letter.

Answer 3

False

A primitive data type starts with a lowercase letter, while non-primitive data type starts with an uppercase letter.

Question 4

When we assign reference values to an object, the data type of the variable and object MUST match in order for the assignment to be successful.

Answer 4

True

Question 5

If you are still initializing a variable, it cannot have a value.

Answer 5

False

A variable can have a value depending on the variable’s data type.

Question 6

When you pass a variable to a method, you are passing the variable’s value.

Answer 6

True

Question 7

Local variables are still not created when you enter a method.

Answer 7

False

Local variables are automatically created when you enter a method, and it is automatically destroyed when you exit the method.

Question 8

String is an object.

Answer 8

True

Question 9

You can call another constructor within the same class by creating an object at the first line of the body of another constructor.

Answer 9

False

You can call another constructor within the same class by using the this() at the first line of the body of another constructor.

Question 10

We can instantiate a class by initializing or creating an object and giving it a unique name.

Answer 10

True

Question 11

Yes, you declare an Array.

Ex:
int[] car, headphone;
or
int car[], headphone[];

Answer 11

True

Question 12

Is this syntax right for initializing the Array?

quiz[] = new int (5);

Answer 12

False

quiz = new int[5];

Question 13

Is this syntax right for adding values in Array?

String[] alphabet = new int {“a”, “b”, “c”, “d”};

Answer 13

False

String[] alphabet = {“a”, “b”, “c”, “d”};

Question 14

The segment below will work, however the output is wrong.

String[] arr = {“earth”, “water”, “air”};
System.out.println(arr);

Answer 14

True

The output is [Ljava.lang.String;@79fc0f2f

Question 15

Will this segment run?

String[] arr = {“earth”, “water”, “air”};

    for(int i : arr){
        System.out.println(i);
    }

Answer 15

False

The array type must match the array type of the index

Question 16

Will this segment run?

String[] arr = {“earth”, “water”, “air”};

    for(String i : arr){
        System.out.println(arr);
    }

Answer 16

True

However, the output is wrong.

Question 17

Arrays in Java are mutable.

Answer 17

False

Arrays in Java are immutable. Once an array size has been declared, you can no longer increase or decrease the size of it.

Question 18

Will this segment work?

String orig[] = {“2”,”5”,”6”,”7”};
String temp[] = new String[5];
System.arraycopy(orig, 0, temp , 0, orig.length);

    for(String i : temp)
    System.out.println(i);

Answer 18

True

The output is:
2
5
6
7
null

Question 19

This segment is legal:

int[][] twoDim = new int[][4];
int[4][4] twoDim = new int[][];

Answer 19

False

int[][] twoDim = new int[4][];
int[][] twoDim = newint[4][4];

Question 20

This segment is an example of ___ array.

int[][] array = new int[4][];
array[0] = new int[3];

Question 21

The super keyword is also used to avoid redundancy.

Answer 21

True

Question 22

Inheritance is a feature that allows you to carry over methods and variables to a subclass

Answer 22

True