3.重载，作用域

矫情吗；* 2024-04-01 19:22 13阅读 0赞

重载

名一样，参数不同

![ce3f9a36fe88480ca9ed36c471a8ada0.png][]

![1f275e9e10d94f76bc680f8d2d95e11f.png][]

可变参数

public class Test1 {
        public static void main(String[] args) {
            int a = sum(1,2,3);
            System.out.println(a);
        }
        public static int sum(int... nums){
            int res = 0;
            for (int i = 0; i < nums.length; i++) {
                res += nums[i];
            }
            return res;
        }
    }

public class Test1 {
        public static void main(String[] args) {
            String a = sum("1",2,3);
            System.out.println(a);
        }
        public static String sum(String nums2, int... nums){
            String res = nums2;
            for (int i = 0; i < nums.length; i++) {
                res += nums[i];
            }
            return res;
        }
    }

![3396e080f7094a84aea51510babe1aa2.png][]

变量的作用域

全局变量:也就是属性，作用于整个主体。有默认值

局部变量：一般指成员方法里面的变量，没有默认值。

![54df2965d7a64b4ca829d4ba62d5d169.png][]

![a4467de85d6a4fe6abddddeaf5ba551c.png][]

![e26f24e4f8ea4736a7fc838eeaf8d1b7.png][] 第五点

![242c604ca67d4ca4b5297029808b0da6.png][]

![36fcedc7ffb0442f8266ce63824b83cf.png][]

[ce3f9a36fe88480ca9ed36c471a8ada0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/6a2a581b8ab04e058228d93fcd7a83a2.png
[1f275e9e10d94f76bc680f8d2d95e11f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/728a8a1b83e54e50802f6c46e411cfb2.png
[3396e080f7094a84aea51510babe1aa2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/0ba53ca8b4a7429d8332ed0de7a95582.png
[54df2965d7a64b4ca829d4ba62d5d169.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/51f70b7160b44d7e8f5e6261cc4e9887.png
[a4467de85d6a4fe6abddddeaf5ba551c.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/3290836d804547d392f644e8fb4ac84f.png
[e26f24e4f8ea4736a7fc838eeaf8d1b7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/16cd0aab2c7c49309792317c9b84d43b.png
[242c604ca67d4ca4b5297029808b0da6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/9ebbbfd24ea3436190b693f33f37222e.png
[36fcedc7ffb0442f8266ce63824b83cf.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/c558a1f8a61440bf95ed1be944acc820.png