public class Example { String str = new String("good"); char[] ch = {'a','b','c'}; public static void main(String[] args) { Example ex = new Example(); ex.change(ex.str, ex.ch); System.out.print(ex.str +"and"); System.out.print(ex.ch); } public void change(String str, char ch[]){ str= "test ok"; ch[0]= 'g'; } }