[Solved] Java – different parameters resulting to different outputs

Question

What I think you’re trying to achieve is that when you call your method “horn” with some parameter it has to either use “Beep!” or “Boop!”.

First of:

void horn(a,b)

Is not a valid function signature in Java, in a java function you always have to specify what type the input you’re providing is.

In your function you’d have to define that a and b are String like so:

void horn(String a, String b)

If you’d want your code to function in the way you wrote it right now you’d have to move your code a little bit and you’d end up with this:

public class Vehicle {
int maxSpeed;
int wheels;
String color;
double fuelCapacity;

void horn(String in) {
    System.out.println(in);
}

void blink() {
    System.out.println("I'm blinking!");
}
}

class MyClass {
public static void main(String[ ] args) {
    String a = "Beep!";
    String b = "Boop!"; 

    Vehicle v1 = new Vehicle();
    Vehicle v2 = new Vehicle();
    v1.color = "red";
    v2.horn(a);
    v1.blink();
    }
}

An other way to achieve the functionality you’re looking for: You could also just use a boolean.

void horn(boolean a) {
    if (a)
    {
        System.out.println("Beep!");
    }
    else
    {
        System.out.println("Boop!");
    }
}

Then in order to do what you wanted to do you’d have to call the method like this:

// Use either true or false.
v2.horn(true); 
v2.horn(false);

Accepted Answer