多态
1.方法的重载
public class Overload {public static void main(String[] args) {Overload ol = new Overload();System.out.println(ol.add(1, 2, 3));System.out.println(ol.mul(2.3f, 3.2f, 1.3f));}public int add(int a,int b,int c){int d = a+b+c;return d;}public double add(float a,float b,float c){double d=(double)a*b*c;return d;}}public class Overload {
