练习1

public class Test {
    String str = new String("good");
    char[] c = new char[]{'a','b','c'};
    public void change(String str,char[] c){
        str = "ok";
        c[0] = 'g';
    }
    public static void main(String[] args) {
        Test t = new Test();
        t.change(t.str,t.c);
        System.out.println(t.str);//输出good
        System.out.println(t.c);//输出gbc
    }
}