return与finally的执行顺序对返回值的影响

对于 try 和 finally 至少一个语句块包含 return 语句的情况：

• finally 语句块会执行
• finally 没有 return，finally 对 return 变量的重新赋值修改无效
• try 和 finally 都包含return，return 值会以 finally 语句块 return 值为准

如下面的例子

 public static void main(String[] args) {
        System.out.println(getString());
    }
    
    public static String getString() {
        String str = "A";
        try {
            str = "B";
            return str;
        } finally {
            System.out.println("finally change return string to C");
            str = "C";
//            return str;
        }
    }

 

打印

finally change return string to C
B

 

 

finally 语句块中新增 return 语句

   public static void main(String[] args) {
        System.out.println(getString());
    }
    
    public static String getString() {
        String str = "A";
        try {
            str = "B";
            return str;
        } finally {
            System.out.println("finally change return string to C");
            str = "C";
            return str;
        }
    }

 

打印结果

finally change return string to C
C

  

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