方法的重载

//  方法的重载public class index04 {public static void main(String[] args) {int a = 1;String b = "b";sum(a);sum(b);sum(a, b);}public static void sum(int a, String b) {System.out.println(a + b);}public static void sum(int a) {System.out.println(a);}public static void sum(String a) {System.out.println(a);}}