public class Test01 {

	public static void main(String args[]){
		int i=1;
		change(i);
		System.out.println(i);
		
		String str="aaa";
		change(str);
		System.out.println(str);
		
		Demo d=new Demo();
		change(d.s);
		System.out.println(d.s);
		
		
	}
	
	
	public static void change(int i){
		i=0;
	}
	public static void change(String str){
		str="bbb";
		
	}
}

class Demo{
	String s="demo";
}