Infosys Certified Java SE11 Developer

Predict the output of the given code. (Assume all the necessary imports are done.)

public class Main {
	public static void main(String[] args) {
		int[] arr = { 70, 50, 30, 10, 20, 40, 60 };
		int value = findValue(arr);
		System.out.println(value);
	}
	private static int findValue(int[] array) {
		int h = Integer.MIN_VALUE;
		int s = Integer.MIN_VALUE;
		for (int i : array) {
			if (i > h) {
				s = h;
				h = i;
			} else if (i > s) { 
				s = i;
			}
		}
		return s;
	}
}

Predict the output obtained on executing the given code snippet. (Assume the code is present in a main() method and all the necessary imports are done)

int vehicleNumber = 2185;
int sum = 0;
while (vehicleNumber != 0) {
	sum += vehicleNumber % 10;
 	vehicleNumber /= 10;
}
if (sum % 3 == 0 || sum % 5 == 0 || sum % 7 == 0) {//Line1
	System.out.println("It is a lucky number");
} else {
	System.out.println("It is not a lucky number");
}

Predict the output of the following code.

public class Main
{
  public static void main(String[] args)
  {
  int[] arr1={5,6,3,1,2};
  int n=arr1.length+1;
        int s=n*(n+1)/2;
        int r=0;
        for (int i = 0; i < arr1.length; i++) {
            r+=arr1[i];
        }
        int f=s-r;
        System.out.println(f);
    }
} 

Predict the output obtained on executing the given code.

class Main {
	public static void main(String args[]) {
		
		int x, y;
		x =2;
		y= 3;
		System.out.println(countt(y, x));
	}
	static int counter(int y, int x) {
		int count = 0;
		if (x == 1)
			return y;
		else {
			for (int i = 1; i <= y; i++) {
				for (int j = 1; j <= y; j++) {
					if (j % i == 0)
						count++;
				}
			}
		}
		return count;
	}
	static int countt(int y, int x) {
		if (x == 1)
			return y;
		if (x == 2) {
			return counter(y, x);
		}
		int mid = x / 2;
		int a = countt(y, x - mid);
		int b = counter(y, mid);
		return a + b - 1;
	}
}

Which access specifiers should be placed at Line1 and Line2 to generate ‘I am HR true’ as the output of the given code?

class Employee{
	protected void role() {
		System.out.print("I am an Employee ");
	}
	protected boolean onRole() {
		return false;
	}
}
class HR extends Employee{
	void role() {  //Line1
		System.out.print("I am HR ");
	}
	 boolean onRole() { //Line2
			return true;
		}
}
public class Tester {
	public static void main(String args[]) {
		Employee h= new HR();
		h.role();
		System.out.println(h.onRole());
	}
}

Given:

public class Test {
	private int sum;
	public int compute() {
 		int x = 0;
 		while (x < 3) {
  			sum += ++x;
 		}
 		return sum / 4;
	}
	public static void main(String[] args) {
 		Test t = new Test();
 		int sum = t.compute();
 		sum = t.compute();
 		t.compute();
 		System.out.println(sum);
	}
}

What is the result?

Given:

public class Thing {
	private String name;
	public Thing(String name) {
 		this.name = name;
	}
	public String toString() {
 		return name;
	}
}

and

public class Tester {
	public static void main(String[] args) {
 		Thing[] things = processThings();
 		/* line 1 */
 		for (Thing t : things) {
  			System.out.println(t);
 		}
	}
	public static Thing[] processThings() {
 		Thing[] things = new Thing[3];
 		things[0] = new Thing("Hat");
 		things[1] = new Thing("Rat");
 		things[2] = things[0];
 		things[0] = new Thing("Cat");
 		things[1] = things[2];
 		return things;
	}
}

How many Thing objects are eligible for garbage collection in line 1?

Given:

interface A{
	public void m1();
}
interface B extends A{
	public default void m2() {
		System.out.println("M2");
	} 
}
interface C extends B{
	public default void m3() {
		System.out.println("M3");
	 }
}
interface D extends C{
		public void m4();
}

Choose the correct option with respect to the above code.

Given:

public class Main {
	class Student {  //line 1
 		String classname;
 		public Student(String classname) { //line 2
  			this.classname = classname;
 		}
	}
	public static void main(String[] args) {
 		var student = new Student("Biology"); //line 3
	}
}

Which two independent changes will make the Main class compile? (Chosoe two)

Given:

public final class X {
   private String name;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String toString() { return getName(); }
}

and

public class Y extends X {
   public Y(String name) {
       super();
       setName(name);
   }
   public static void main (String... args) {
       Y y = new Y("HH"); 
       System.out.println(y);
   }
}

What is the result?