Example
Create a Car object named myCar. Call the fullThrottle() and speed() methods on the myCar object, and run the program:
// Create a Main class
public class Main {
// Create a fullThrottle() method
public void fullThrottle() {
System.out.println("The car is going as fast as it can!");
}
// Create a speed() method and add a parameter
public void speed(int maxSpeed) {
System.out.println("Max speed is: " + maxSpeed);
}
// Inside main, call the methods on the myCar object
public static void main(String[] args) {
Main myCar = new Main(); // Create a myCar object
myCar.fullThrottle(); // Call the fullThrottle() method
myCar.speed(200); // Call the speed() method
}
}
// The car is going as fast as it can!
// Max speed is: 200
Example explained
1) We created a custom Main class with the class keyword.
2) We created the fullThrottle() and speed() methods in the Main class.
3) The fullThrottle() method and the speed() method will print out some text, when they are called.
4) The speed() method accepts an int parameter called maxSpeed - we will use this in 8).
5) In order to use the Main class and its methods, we need to create an object of the Main Class.
6) Then, go to the main() method, which you know by now is a built-in Java method that runs your program (any code inside main is executed).
7) By using the new keyword we created an object with the name myCar.
8) Then, we call the fullThrottle() and speed() methods on the myCar object, and run the program using the name of the object (myCar), followed by a dot (.), followed by the name of the method (fullThrottle(); and speed(200);). Notice that we add an int parameter of 200 inside the speed() method.
Remember that..
The dot (.) is used to access the object's attributes and methods.
To call a method in Java, write the method name followed by a set of parentheses (), followed by a semicolon (;).
A class must have a matching filename (Main and Main.java).
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