Using parameters

Arguments and Parameters:

Arguments: Values ​​passed to a method when it is called.
Parameters: Variables within the method that receive arguments.

Parameter Declaration:

Declared within parentheses after the method name.
They have the same declaration syntax as normal variables.
They are local to the method and have the task of receiving arguments.

Simple Example with Parameter:

• ChkNum Class Example:

class ChkNum {
    boolean isEven(int x) {
        return (x % 2) == 0;
    }
}

Method isEven(int x) returns true if the passed value is even, false otherwise.

• Example of Using the isEven Method: The ParmDemo class demonstrates the use of the isEven method.

class ParmDemo {
    public static void main(String args[]) {
        ChkNum e = new ChkNum();
        if(e.isEven(10)) System.out.println("10 is even.");
        if(e.isEven(9)) System.out.println("9 is even.");
        if(e.isEven(8)) System.out.println("8 is even.");
    }
}

The method is called with different values ​​and the argument is passed in parentheses.

Multiple Parameters:
A method can have more than one parameter, separated by commas.

• Example with Multiple Parameters: Factor Class: Method isFactor(int a, int b) checks whether a is a factor of b. Usage of the isFactor Method: Arguments are passed separated by commas.

See class Factor.java from the book

public class IsFact {
    public static void main(String args[]) {
        Factor x = new Factor();
        if(x.isFactor(2, 20)) System.out.println("2 is factor");
        if(x.isFactor(3, 20)) System.out.println("this won't be displayed");
    }
}

Different Types of Parameters:

Parameters can have different types and are specified individually.

int myMeth(int a, double b, float c) {
// ...

This summary covers the main points about using parameters in methods, including the syntax and practical examples with the isEven() and isFactor() method.

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