JAVA QUIZ 15

1.What will happen when you compile and run the following code?

import java.util.ArrayList;
import java.util.List;

public class Test{

public static void main(String[] args){
List listColors = new ArrayList<>();
listColors.add("Red");
listColors.add("Green");
listColors.add("Blue");

changeMe(listColors);

System.out.println(listColors);
}

private static void changeMe(final List listColors) {
listColors.add("Cyan");
listColors.remove("Blue");
}
}

2. What will happen when you compile and run the following code?

public class Test {

public static void main(String[] args){

int temperature = 33;

if(temperature < 0)
System.out.println("Freezing");
else if(temperature < 30)
System.out.println("Pleasant");
else if(temperature < 50)
System.out.println("Hot");
else
System.out.println("Boiling");

}
}

3. What will happen when you compile and run the following code?

public class Test {

public static void main(String[] args){

int i = 49;

if(i < 50){
System.out.println("Greater than 50");
System.out.println("Great");
}else
System.out.println("Less than 50");

}
}

4.Select all true statements from the following statements

5. What will happen when you compile and run the following code with assertion enabled?

public class Test{

public static void main(String[] args){
displayAge(20);
}

private static void displayAge(int age){
assert age >= 21 : getAgeMessage();
System.out.println(age);
}

private static String getAgeMessage() {
return "Your age must be greater than 21";
}

}

6. Running a java program with -enableassertions switch will enable assertion for your program

7. Running a java program with -ea switch will enable assertion in system classes.

8. Only way to enable assertion for your program is by using command line arguments.

9. If the Java program is using assertions, it must be run with -ea or -enableassertions switches.

10. What will happen when you compile and run the following code with assertion enabled?

public class Test{

public static void main(String[] args){

int[] marks = {40, 38, 52};
boolean[] pass = {false, false, false};

for(int i = 0 ; i < marks.length; i++){

try{

assert marks[i] >= 40 : pass[i] = true;

}catch(AssertionError ae){
pass[i] = false;
}
}

for(boolean b : pass)
System.out.print(b + ",");
}
}