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The Java Interview Handbook: 300+ Interview Questions

Boxing

This lesson discusses the concept of Boxing in Java.

We'll cover the following...
1.

What is boxing or autoboxing?

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Technical Quiz
1.

What will be the output of the following code snippet?

        Long value = 7L;
        System.out.println(value.equals(7));
A.

True

B.

False

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Technical Quiz
1.

What will be the output of the following snippet?

        Long value1 = 7L;
        System.out.println(value1 == 7);
A.

true

B.

false

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Technical Quiz
1.

What will be the output of the following change made to the snippet presented earlier?

        Long value = 7L;
        System.out.println(value.equals(7L));
A.

true

B.

false

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Technical Quiz
1.

What will be the output of the following snippet?

        Long value1 = 7L;
        Long value2 = 7L;
        System.out.println(value1 == value2);
A.

true

B.

false

1 / 1
Technical Quiz
1.

What will be the output of the following snippet?

        Long value1 = 7L;
        Long value2 = 7L;
        System.out.println(value1.equals(value2));
A.

true

B.

false

1 / 1
Technical Quiz
1.

What will be the output of the following snippet?

        Long value1 = 20007L;
        System.out.println(value1 == 20007L);
A.

true

B.

false

1 / 1
Technical Quiz
1.

What will be the output of the following snippet?

        Long value1 = 20007L;
        Long value2 = 20007L;
        System.out.println(value1 == value2);
A.

true

B.

false

1 / 1

Questions 4 - 8 are below:

Java
class Demonstration {
    public static void main( String args[] ) {
        Long value = 7L;
        System.out.println("\nLong value = 7L;\nvalue.equals(7) " + value.equals(7));
        System.out.println("value == 7 " + (value == 7));
        System.out.println("value.equals(7L) " + value.equals(7L));
        Long value1 = 7L;
        Long value2 = 7L;
        System.out.println("\n\nLong value1 = 7L;\nLong value2 = 7L;\nvalue1 == value2 " + (value1 == value2));
        System.out.println("value1.equals(value2) " + value1.equals(value2));
        value1 = 20007L;
        value2 = 20007L;
        System.out.println("\n\nvalue1 = 20007L;\nvalue2 = 20007L;\nvalue1 == 20007L " + (value1 == 20007L));
        System.out.println("value1 == value2 " + (value1 == value2));
        System.out.println("value1.equals(20007L) " + value1.equals(20007L));
    }
}

Note in the above snippet how the comparison using == operator for the variables initialized to 7 yields true, whereas the same comparison when values are ...