JP-Quiz-1

String og = "helloworld";

String og2 = new String(og);

System.out.println((og==og2) + " "+ (og.equals(og2)));

• true true

• true false

• false true

• false false

int five = 5;

int two = 2;

int total = five + (five > 6 ? ++two : --two);

• 1

• 2

• 4

• 6

Which one is not a valid statement in Java?

double num = 2.718;

double num = 2._718;

double num = 2.7_1_8;

• double num = 2.718;

• double num = 2._718;

• double num = 2.7_1_8;

• none

How many strings can be collected by Garbage Collector in the following code snippet?

public static void main(String[] fruits) {

String str1 = new String("open");

String str2 = new String("source");

String str2 = new String("opengenus");

str3 = str1;

str2 = str3;

str1 = str2;

}

• 0

• 1

• 2

• 3

What line in this code snippet will give compilation error?

double d1 = 5f; // c1

double d2 = 5.0; // c2

float f1 = 5f; // c3

float f2 = 5.0; // c4

• c1

• c2

• c3

• c4

What is the output of the following code snippet?

public static void main(String... args) {

String car, bus = "petrol";

car = car + bus;

System.out.println(car); }

• petrol

• petrolpetrol

• Compilation error

• Runtime error

Which code statement give compilation error?

double num1, int num2 = 1; // C1

int num1, num2; // C2

int num1, num2 = 1; // C3

int num1 = 2, num2 = 1; // C4

• c1

• c2

• c3

• c4

public class Test {

public static void main(String[] args) {

for(int i=0; 0; i++) {

System.out.println("Hello World!");

}

}

}

• Hello World!

• no output

• Compilation error

• Runtime error

class HelloWorld {

public static void main(String[] args) {

while(false){

System.out.println("Hello World!");

}

}

}

• Hello World!

• no output

• Compilation error

• Runtime error

What is the output of the following code snippet?

public class Code {

public static void main(String[] args) {

for(int i = 0; i < 1; i++) {

System.out.println(i+' ');

} } }

• 1

• 0

• 32

• error