Java Programming Test 4

What will be the output?

for(int i = 0; i < 5; i += 2) {
    System.out.print(i + " ");
}

What will this code print?

int fact(int n) {
    if(n == 1) return 1;
    return n * fact(n - 1);
}
System.out.println(fact(4));

Which statement is correct?

What will this code print?

int[] a = {1, 2, 3};
int[] b = a;
b[0] = 99;
System.out.println(a[0]);

Which is correct about creating a custom exception?

What will this code print?

import java.util.*;
class Test {
    public static void main(String[] args) {
        Map<Integer, String> map = new HashMap<>();
        map.put(1, "Java");
        map.put(2, "Python");
        map.put(1, "C++");
        System.out.println(map);
    }
}

Which syntax is used for a generic type that can accept Integer or its supertypes?

Which is a valid method reference in Java?

What will this code print?

import java.util.*;
public class Test {
    public static void main(String[] args) {
        List<String> names = Arrays.asList("John", "Jane", "Jack");
        long count = names.stream().filter(s -> s.startsWith("J")).count();
        System.out.println(count);
    }
}

Which class provides factory methods for creating thread pools?

What will be the output?

int n = 5;
do {
    System.out.println(n);
    n++;
} while(n < 5);

What will the following code print?

void display(int... nums) {
    System.out.println(nums.length);
}
display(10, 20, 30);

What will this code print?

StringBuilder sb = new StringBuilder("Java");
System.out.println(sb.reverse());

Which class provides a built-in method to sort arrays in Java?

Which Java version introduced try-with-resources for automatic resource management?

Which method of `Iterator` is used to remove an element during iteration?

What will this code print?

class Box<T> {
    T value;
    Box(T value) { this.value = value; }
    T get() { return value; }
}
public class Test {
    public static void main(String[] args) {
        Box<String> b = new Box<>("Java");
        System.out.println(b.get());
    }
}

Which statement about lambda expressions is true?

Which method is used to create a parallel stream from a list?

Which is true about Callable vs Runnable?