(オリジナルデータ型)について

public class Question12{
	
	public static void main(String[] args){
		int x=5;
		Question12 q = new Question12();
		q.doStuff(x);
		System.out.println(" main x = " + x);
	}
	
	void doStuff(int x){
		System.out.println("doStuff x = " + x++);
	}
}

//OutPut:~
doStuff x = 5
main x = 5