Question1: What is the result of below program?

public class TestVariables {

	int x,y;
	public TestVariables(int x,int y) {
		intialize(x,y);
	}
   public void  intialize(int x,int y) {
			this.x = x*x;
			this.y=y*y;
	}
	public static void main(String[] args) {
		int x=3,y=5;
		TestVariables test = new TestVariables(x,y);
		System.out.println(x+ "   "+y);
	}

}

A. Compilation fails.
B. 3 5
C. 0 0
D. 9 25

Answer: B

Question2: What is the result of the below program?

public class SwitchTest {
	public static void main(String[] args) {
		int wd=0;
		String days[] = {"sun","mon","wed","sat"};
		for(String s:days) {
			switch(s) {
			case "sat":
			case "sun":
				wd-=1;
				break;
			case "mon":
				wd++;
			case "wed":
				wd+=2;
			}
		}
		System.out.println(wd);
	}
}

A. 3
B. 4
C. -1
D. Compilation fails.

Answer: A

Question3: Given below program:

public class MyFile {

	public static void main(String[] args) {
		String arg1 = args[1];
		String arg2 = args[2];
		String arg3 = args[3];
		System.out.println("Arg is"+arg3);
	}

}

Which command-line arguments should you pass to the program to obtain the following output? Arg is 2
A. java MyFile 1 3 2 2
B. java MyFile 2 2 2
C. java MyFile 1 2 2 3 4
D. java MyFile 0 1 2 3

Answer: A

Question4: Given below code :

StringBuilder sb1 = new StringBuilder();
    String str1 = sb1.toString();
    // Insert Code Here
    System.out.println(str1 == str2);

Which code fragment, when inserted at line 9, enables the code to print true?
A. String str2 = str1;
B. String str2 = new String(str1);
C. String str2 = sb1. toString();
D. String str2 = “Duke”;

Answer: A

Question5: Given the below program:

public class TestCal {
	public void updatePrice(Product product,double price) {
		price = price *2;
		product.price = product.price + price;
	}
	public static void main(String[] args) {
		Product product = new Product();
		product.price = 200;
		double price = 100;
		
		TestCal test = new TestCal();
		test.updatePrice(product, price);
		System.out.println(product.price+":"+price);
	}
}

What is the result?
A. 200.0 : 100.0
B. 400.0 : 200.0
C. 400.0 : 100.0
D. Compilation fails.

Answer: C

Question6: Given the below

public class Test {

	public static void main(String[] args) {
		boolean a = new Boolean(Boolean.valueOf(args[0]));
		boolean b = new Boolean(args[1]);
		System.out.println(a + "" + b);
	}

}
javac Test.java
java Test 1 null

What is the result?
A. 1 null
B. true false
C. false false
D. true true
E. A ClassCastException is thrown at runtime.

Answer: C

Leave a Reply

Your email address will not be published. Required fields are marked *