Quiz

Java Intermediate

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Quiz

Question 1

Consider the following code snippet:

import java.util.HashSet;

public class Test {
    public static void main(String[] args) {
        HashSet<Integer> set = new HashSet<>();
        set.add(10);
        set.add(20);
        set.add(10);
        System.out.println(set.size());
    }
}

What is the output?

A

1

B

2

C

3

D

0

Question 2

Which method removes all elements from a Set?

A

clear()

B

deleteAll()

C

removeAll()

D

purge()

Question 3

Consider the following code snippet that uses a LinkedHashSet:

import java.util.LinkedHashSet;

public class Test {
    public static void main(String[] args) {
        LinkedHashSet<String> set = new LinkedHashSet<>();
        set.add("One");
        set.add("Two");
        set.add("Three");
        System.out.println(set);
    }
}

What is guaranteed about the output order?

A

The output is sorted in natural order.

B

The output order is random.

C

The output order is the same as the insertion order.

D

The output order is reversed compared to insertion order.

Examine the following code snippet for a TreeSet with natural ordering:

import java.util.TreeSet;

public class Test {
    public static void main(String[] args) {
        TreeSet<String> fruits = new TreeSet<>();
        fruits.add("Banana");
        fruits.add("Apple");
        fruits.add("Cherry");
        System.out.println(fruits);
    }
}

What is the output?

A

[Banana, Apple, Cherry]

B

[Apple, Banana, Cherry]

C

[Cherry, Banana, Apple]

D

The output order is undefined.

.....

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