使用 final 关键字修饰一个变量时，是引用不能变，还是引用的对象不能变？

[Bol5261]

public class S_Final {
 public static void main(String[] args){
  final StringBuffer a=new StringBuffer("abc");
  System.out.println("a="+a);
  //a=new StringBuffer("abc!");
  System.out.println("a="+a);
  a.append("abcd");
  System.out.println("a="+a);
  StringBuffer b=new StringBuffer("main ok!");
  System.out.println("b="+b);
  b=new StringBuffer("main is ok!");
  System.out.println("b="+b);
 }
}



a=abc
a=abc
a=abcabcd
b=main ok!
b=main is ok!

Process finished with exit code 0

 

[CSDN-Ada助手]

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