Java重载可以有不同的返回类型

package test;

public class Main {
// static int i;
public static void main(String[] args) {
// TODO Auto-generated method stub
Main main = new Main();
System.out.println(main.aa(1));
System.out.println(main.aa(1,2));
}

int aa(int a) {
return a + 100;
}

String aa(int a, int b) {
return String.valueOf(a + b);
}
}

输出：
101
3