Java: Classes and Objects UPDATED ACTUAL Exam Questions and CORRECT Answers

Java: Classes and Objects UPDATED ACTUAL Exam Questions
and CORRECT Answers



Declaring a method - class Myclass{


static void sayHello(){

//sayHello is the method

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

}



public static void main (String [ ] args) {
sayHello();

sayHello();

sayHello();

}

}

/* output:

Hello World!

Hello World!
Hello World!

*/



code reuse - You can write a method once, and use it multiple times, without having to rewrite
the code each time


Return value syntax - class MyClass {

, static int sum(int val1, int val2) {

return val1 + val2;

}


public static void main(String[ ] args) {

int x = sum(2, 5);

System.out.println(x);

}

}

//output 7


*Note: The return is saying to add val 1 and val 2 (parameters), as you can see in the next
function starting with public, there is a variable with x and the sum has (2,5) those two will be
added due to the method prior


Public - The class is accessible by any other class.



Package - A group of similar types of classes


Default - A variable or method declared with no access control modifier is available to any other
class in the same package.



Protected - Same as default, with the addition that subclasses can access protected methods and
variables of the superclass (learn more about subclasses and superclass later)



Private - Accessible only within the declared class itself