JAVA BlueJ question

[jellyrole]

Can someone please explain how this code outputs 2,9,12,3?

import java.util.*;
public class Exam4 {
    public static void main(String[] args) {
    int a = 3;
    int b = Exam4.method2(a);
    System.out.println(b);
    Exam4.method1(a, b);
    System.out.println(a);
}
    public static void method1(int x, int y) {
    System.out.println(x+y);
}
    public static int method2(int x) {
    System.out.println(x-1);
    return x*x;
}
}

 

[KIAman]

It seems a little obvious considering it's pretty sequential. What are you lost on?

int b = Exam4.method2(a); //prints out 2 because of method2 while setting b to 9
System.out.println(b); //prints out 9 because b is 9
Exam4.method1(a, b); // prints out 12 because method2
System.out.println(a); // prints out 3 because a is 3

 

[jellyrole]

Thanks, I'm not sure what I was having trouble with..

 

[KIAman]

Thanks, I'm not sure what I was having trouble with..

Maybe you had trouble understanding passing variables by VALUE or by REFERENCE? How they are stored in memory and in what scope they operate in?