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java中实现两个字符串交换 java, 字符串 
class Sunflower {
 public static String str1;
 public static String str2;
}

public class Demo {
 public static void main(String[] args) throws Exception {
  Sunflower s = new Sunflower();
  s.str1 = "111";
  s.str2 = "222";
  change(s);
  System.out.println(s.str1);
  System.out.println(s.str2);
 }

 public static void change(Sunflower s1) {
  String temp = s1.str1;
  s1.str1 = s1.str2;
  s1.str2 = temp;
 }
}
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