Java Programming Test 2

    Question 1: JAVA - Type Casting

    What will happen in the following code?

    double d = 9.7;
int x = (int) d;
System.out.println(x);

    Question 2: JAVA - Method Overloading

    Which statement about method overloading is true?

    Question 3: JAVA - String Concatenation

    What will this code print?

    String s1 = "Hello";
String s2 = "World";
String s3 = s1 + s2;
System.out.println(s3);

    Question 4: JAVA - Array Length

    What will this code print?

    int arr[] = {10, 20, 30, 40};
System.out.println(arr.length);

    Question 5: JAVA - Finally Block

    What will be the output?

    try {
    System.out.println("Try");
} finally {
    System.out.println("Finally");
}

    Question 6: JAVA - Set Characteristics

    Which statement about `Set` is true?

    Question 7: JAVA - Generic Method

    Which syntax is correct for a generic method?

    Question 8: JAVA - Functional Interface

    Which annotation is used to mark a functional interface in Java?

    Question 9: JAVA - Filter Operation

    What will this code print?

    import java.util.*;
public class Test {
    public static void main(String[] args) {
        List<Integer> nums = Arrays.asList(1, 2, 3, 4, 5);
        nums.stream().filter(n -> n % 2 == 0).forEach(System.out::print);
    }
}

    Question 10: JAVA - Runnable Example

    What will this code print?

    class MyTask implements Runnable {
    public void run() {
        System.out.println("Task executed");
    }
}
public class Test {
    public static void main(String[] args) {
        Thread t = new Thread(new MyTask());
        t.start();
    }
}

    Question 11: JAVA - if-else Statement

    What will be the output of the code?

    int a = 5;
if(a > 10) {
    System.out.println("Big");
} else {
    System.out.println("Small");
}

    Question 12: JAVA - Method Overloading Example

    What will the following code print?

    class Test {
    void show(int x) { System.out.println("int: " + x); }
    void show(String s) { System.out.println("String: " + s); }
}
Test t = new Test();
t.show("Java");

    Question 13: JAVA - String equals() vs ==

    What will be the output?

    String s1 = "Java";
String s2 = new String("Java");
System.out.println(s1 == s2);
System.out.println(s1.equals(s2));

    Question 14: JAVA - Index Out of Bounds

    What will happen in the code?

    int arr[] = new int[3];
System.out.println(arr[3]);

    Question 15: JAVA - Multiple Catch Blocks

    Which catch block order is correct?

    Question 16: JAVA - Map Basics

    Which statement is correct about `Map`?

    Question 17: JAVA - Type Safety Example

    What will happen in this code?

    List list = new ArrayList();
list.add("Hello");
list.add(10);
String s = (String) list.get(1);
System.out.println(s);

    Question 18: JAVA - Lambda Example

    What will this code print?

    interface Say {
    void speak(String msg);
}
public class Test {
    public static void main(String[] args) {
        Say s = (msg) -> System.out.println("Hello " + msg);
        s.speak("Java");
    }
}

    Question 19: JAVA - Map Operation

    What will this code print?

    import java.util.*;
public class Test {
    public static void main(String[] args) {
        List<String> words = Arrays.asList("a", "bb", "ccc");
        words.stream().map(String::length).forEach(System.out::print);
    }
}

    Question 20: JAVA - Sleep Method

    What does Thread.sleep(1000) do?