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";
		}
	}

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