Quiz
record Student(String name, int age) {}
1. package com.udayankhattry.ocp;
2.
3. import java.util.*;
4.
5. record Student(String name, int age) {}
6.
7. public class Test {
8. public static void main(String[] args) {
9. Set<Student> students = new TreeSet<>();
10. students.add(new Student("Samuel", 21));
11. students.add(new Student("Samuel", 21));
12. students.add(new Student("Samuel", 21));
13.
14. System.out.println(students.size());
15. }
16. }
1. record Student(String name, int age) implements Comparable<Student> {
2. public int compareTo(Student stud) {
3. return this.name.compareTo(stud.name);
4. }
5. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.*;
4.
5. record Student(String name, int age) {
6. public static int compareByName(Student s1, Student s2) {
7. return s1.name().compareTo(s2.name());
8. }
9. }
Quiz
11. public class Test {
12. public static void main(String[] args) {
13. Set<Student> students = new TreeSet<>(Student::compareByName);
14. students.add(new Student("Martha", 16));
15. students.add(new Student("Martha", 17));
16. students.add(new Student("Martha", 18));
17.
18. System.out.println(students.size());
19. }
20. }
1. record Student(String name, int age) {
2. public static int compareByName(Student s1, Student s2) {
3. return s1.name().compareTo(s2.name());
4. }
5. }
1. private final String name;
2. private final int age;
1. public int name() { return name; }
2. public int age() { return age; }
1. Student(String name, int age) {
2. this.name = name;
3. this.age = age;
4. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.*;
4.
Quiz
1. package com.udayankhattry.ocp;
2.
3. import java.util.Set;
4.
5. public class Test {
6. public static void main(String[] args) {
7. Set<Integer> set = Set.of(10, null, 20, 40, null); //Line n1
8. System.out.println(set.size());
9. }
10. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.Set;
4.
5. public class Test {
6. public static void main(String[] args) {
7. Set<String> set = Set.of("A", "E", "I", "I", null, "O", "U");
8. System.out.println(set.size());
9. }
10. }
Quiz
2.
3. import java.util.List;
4. import java.util.Map;
5. import java.util.Set;
6.
7. public class Test {
8. public static void main(String[] args) {
9. var list = List.of("A", "E", "I", "O", "U"); //Line n1
10. var set1 = Set.copyOf(list); //Line n2
11.
12. var map = Map.of(1, "U", 2, "O", 3, "I", 4, "E", 5, "A"); //Line n3
13. var set2 = Set.copyOf(map.values()); //Line n4
14.
15. System.out.println(set1.equals(set2)); //Line n5
16. }
17. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.Set;
4.
5. public class Test {
6. public static void main(String[] args) {
7. var sb1 = new StringBuilder("A");
8. var sb2 = new StringBuilder("B");
Quiz
10. var set2 = Set.copyOf(set1); //Line n2
11. System.out.println((set1 == set2) + ":" + set1.equals(set2)); //Line n3
12. }
13. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.Set;
4.
5. public class Test {
6. public static void main(String[] args) {
7. var set1 = Set.of(new StringBuilder("GOD"),
8. new StringBuilder("IS"), new StringBuilder("GREAT"));
9. var set2 = Set.of(new StringBuilder("GOD"),
10. new StringBuilder("IS"), new StringBuilder("GREAT"));
11. System.out.println((set1 == set2) + ":" + set1.equals(set2));
12. }
13. }
Quiz
1. package com.udayankhattry.ocp;
2.
3. import java.util.*;
4.
5. enum TrafficLight {
6. RED, YELLOW, GREEN
7. }
8.
9. public class Test {
10. public static void main(String[] args) {
11. Map<TrafficLight, String> map = new TreeMap<>();
12. map.put(TrafficLight.GREEN, "GO");
13. map.put(TrafficLight.RED, "STOP");
14. map.put(TrafficLight.YELLOW, "READY TO STOP");
15.
16. for(String msg : map.values()) {
17. System.out.println(msg);
18. }
19. }
20. }
Quiz
4.
5. public class Test {
6. public static void main(String[] args) {
7. var map = Map.of("ONE", 1, "TWO", 2, "THREE", 4, "THREE", 3); //Line n1
8. var res = 0;
9. for(Integer num : map.values()) { //Line n2
10. res += num;
11. }
12. System.out.println(res);
13. }
14. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.Map;
4.
5. public class Test {
6. public static void main(String[] args) {
7. var map = Map.of(
8. 1, "A",
9. 2, "B",
10. 3, "C",
Quiz
12. 5, "E",
13. 6, "F",
14. 7, "G",
15. 8, "H",
16. 9, "I",
17. 10, "J",
18. 11, "K"
19. );
20. var res = "";
21. for(String str : map.values()) {
22. res += str;
23. }
24. System.out.println(res);
25. }
26. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.List;
4. import java.util.Map;
5.
6. public class Test {
7. public static void main(String[] args) {
Quiz
13. System.out.println(deque.pop() + ":" + deque.peek() + ":" + deque.size());
14. }
15. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.LinkedList;
4. import java.util.List;
5. import java.util.Queue;
6.
7. public class Test {
8. public static void main(String[] args) {
9. List<String> list = new LinkedList<>();
10. list.add("ONE");
11. list.add("TWO");
12. list.remove(1);
13. System.out.println(list);
14.
15. Queue<String> queue = new LinkedList<>();
16. queue.add("ONE");
17. queue.add("TWO");
18. queue.remove();
19. System.out.println(queue);
20. }
21. }
Quiz
1. package com.udayankhattry.ocp;
2.
3. import java.util.ArrayDeque;
4. import java.util.Deque;
5.
6. public class Test {
7. public static void main(String[] args) {
8. Deque<Character> chars = new ArrayDeque<>();
9. chars.add('A');
10. chars.add('B');
11. chars.remove();
12. chars.add('C');
13. chars.remove();
14.
15. System.out.println(chars);
16. }
17. }
1. package com.udayankhattry.ocp;
2.
3. import java.util.ArrayDeque;
4. import java.util.Deque;
5.
6. public class Test {
7. public static void main(String[] args) {
8. Deque<Character> chars = new ArrayDeque<>();
9. chars.add('A');
10. chars.remove();
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