class Foo {
	static class Bar {
		public String name = "msg 1";
	}

	static void change (Bar bar) {
		bar.name = "msg 2";
	}

	public static void main (String[] args) {
		Bar bar = new Bar();
		System.out.println(bar.name);
		change(bar);
		System.out.println(bar.name);
	}
}