4.方法重载

package structMehtod;

public class Calc {
    public int getSum(int num1,int num2){
        System.out.println("int");
        return num1+num2;
    }
    
    public double getSum(double num1,double num2){
        System.out.println("double");
        return num1+num2;
    }
    
    public double getSum(double num1,double num2,double num3){
        return num1+num2+num3;
    }
    
    public static void main(String[] args) {
        Calc calc=new Calc();
        System.out.println(calc.getSum(67, 89));
        System.out.println(calc.getSum(67, 89,78.4));
    }
}