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Today, we're going to discuss how to call methods in Java. Remember, a method is a block of code that performs a specific task. Can anyone remind me why we use methods?
To organize the code and avoid repetition!
Exactly! Now, once a method is defined, we need to call it to execute its code. Let's take a look at how we do that.
In our example, we created a class called 'Main' with a method 'multiply'. What do we need to do to call this method from our 'main()'?
We need to create an object of the 'Main' class!
Correct! By creating an object using 'Main obj = new Main();', we can then call the 'multiply' method like this: 'obj.multiply(4, 5);'.
And that will calculate the product of 4 and 5 and store it in a variable?
Yes, it will! The result is then printed out. Excellent observation!
After calling the 'multiply' method, what do we see in the output?
It prints 'Result: 20'!
Great! This shows how the method returns a value, which we can capture in a variable and then use. Who can summarize the steps we just covered in calling a method?
We first define a method, create an object of its class, call the method using the object, and then display the output.
Exactly! You've all grasped the key concepts well today.
To call a method, you must create, an object first, it's really great!
Imagine a factory where each machine (method) needs an operator (object) to function. Without the operator, the machine just sits idle!
Object -> Create -> Call. Remember: O-C-C to call a method!
C.O.C. - Create an Object, Call the method!
Term
What is a method in Java?
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Term
How do you call a method?
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This section explains how to call methods in Java, including the use of objects to access instance methods.
Calling a method in Java involves invoking a defined function either from the 'main()' method or another method. This section provides a detailed example of how to instantiate a class object and call one of its methods to achieve a desired output.
In Java, once a method is declared, it can be utilized by invoking it within a method, such as 'main()'. This section outlines the essential syntax and process of calling a method. A method defined within a class can be accessed by creating an instance (object) of the class. For instance, in the provided example, the 'multiply' method of the 'Main' class is utilized to calculate the product of two integers. The method returns the computed value, which is then printed to the console. This concept of calling methods is fundamental in Java programming as it exemplifies code reuse and modular programming.