String

 1 public class ch01 {
 2     String str = "lisi";
 3     public static void change(String str){
 4         System.out.println(str);
 5     }
 6     
 7     public static void main(String[] args) {
 8         ch01 c = new ch01();
 9         String str01 = "zhangsan";
10         change(str01);
11         System.out.println(c.str);
12     }
13 }