Logic Building in Java Part 1

What is the output of the following code?

if (a){

System.out.println("A");

}

else if(a && b){

System.out.println("A && B");

}

else {

if(!b) {

System.out.println("notB");

}

else{

System.out.println("ELSE");

}

}

• If a is true and b is true then output is A && B.

• If a is true and b is false then output is notB.

• If a is false and b is true then the output is ELSE.

• If a is false and b is false then the output is ELSE.

What is the value of discount after the code block?

char gender='F';

byte discount;

if (gender='M') {

discount=10;

}

else{

discount=20;

}

• 10

• Compilation Error

• 20

• Runtime Error

What will be the output of the following program?

public class ShortTest {

public static void main(String[] args) {

boolean x = true;

boolean y = false;

if (x || y) {

System.out.println(true);

}

else {

System.out.println(false);

}

}

}

• False

• Runtime Error

• True

• Compilation Error

Given the following:

long[][] stuff ;

Which of the following statements constructs an array with 5 rows of 7 columns each and assign its reference to stuff ?

• stuff = new stuff[5][7] ;

• stuff = long[5][7] ;

• stuff = long[7][5] ;

• stuff = new long[5][7] ;

Examine the following:

double[][] values =

{ {1.2, 9.0, 3.2},

{9.2, 0.5, 1.5, -1.2},

{7.3, 7.9, 4.8} } ;

What is in values[3][0] ?

• 7.3

• Error

• 7.9

• 9.2

From the following select the right way to invoke following method in the main method

class Example

{

static int add(inta,int b) {

return a+b;

}

}

• add(20,30)

• Example obj=new Example(); obj.add(10,20);

• Static.add(10,20);

• Example.add(10,20)

What is the output of the following code?

class Main{

public static void main(String []s)

{

float x=12.34F;

float y=13.25F;

float result=min(x,y);

System.out.println(result);

}

public static float min(float a,float b)

{

float minimun=a>b?b:a;

}

}

• Compilation Error- function should have a return statement

• 12.34

• Compilation Error - cannot invoke method without creating object

• Runtime Error

What will be output of following code?

import java.util.Scanner;

public class Main

{

public static Integer add(Integer a, Integer b) {

return a + b;

}

public static void main(String args[])

{

System.out.println(add(5,6));

}

}

• 11

• Compilation Error

• Runtime Error

• Compile and execute without any Exception or error

Choose the option to fill the blanks.

public class Power {

public static void main(String[] args) {

int base = 3, exponent = 4;

long result=_____;

System.out.println("3 power 4 = " + result);

}

public static long power(int b,int e) {

long result=1;

for (;e != 0; --e) {

result * = b;

}

return result;

}

}

• power(b,e);

• power(base,exponent);

• 3 power 4 = 81

• power(e,base);

Choose a code snippet from the following to perform power(x,n) an the output is Answer = 8

• while (n<=0)

  {

  r += x;

  n++;

  }

• while (n >= 0)

  {

  r *= x;

  n++;

  }

• while (n > 0)

  {

  r += x;

  --n;

  }

• while (n != 0)

  {

  r *= x;

  --n;

  }