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Method Parameters and Return Values

Method Example​

Here are a few examples to illustrate different types of methods:

Method with No Parameters and No Return Value​

public void printHello() {
    System.out.println("Hello, World!");
}

Method with Parameters and a Return Value​

public int multiply(int x, int y) {
    return x * y;
}

Method with No Parameters but a Return Value​

public String getGreeting() {
    return "Hello, Java!";
}

Method with Multiple Parameters​

public double calculateArea(double width, double height) {
    return width * height;
}

Calling Methods​

To call a method, use the method name followed by parentheses. If the method requires parameters, provide the appropriate arguments within the parentheses.

Example​

public class Main {
    public static void main(String[] args) {
        Main obj = new Main();
        
        // Calling a method with no parameters and no return value
        obj.printHello();
        
        // Calling a method with parameters and a return value
        int result = obj.add(5, 3);
        System.out.println("Sum: " + result);
        
        // Calling a method with no parameters but a return value
        String greeting = obj.getGreeting();
        System.out.println(greeting);
        
        // Calling a method with multiple parameters
        double area = obj.calculateArea(5.5, 4.0);
        System.out.println("Area: " + area);
    }
    
    public void printHello() {
        System.out.println("Hello, World!");
    }

    public int add(int a, int b) {
        return a + b;
    }

    public String getGreeting() {
        return "Hello, Java!";
    }

    public double calculateArea(double width, double height) {
        return width * height;
    }
}