On Day 11, we learn about methods. Methods in Java are blocks of code designed to perform specific tasks. Instead of repeating code, we can write a method once and call it whenever needed. This improves code readability and reusability.
1. Defining a Method
public class MethodExample {
// method definition
static void greet() {
System.out.println("Hello, welcome to Java!");
}
public static void main(String[] args) {
// method call
greet();
}
}
Explanation: The method greet() is defined using static void. It prints a message and can be called multiple times.
2. void vs return methods
void means the method does not return any value. If we want a method to return something, we use a return type like int or String.
public class ReturnMethodExample {
// void method
static void sayHello() {
System.out.println("Hello from void method!");
}
// method with return type
static int add(int a, int b) {
return a + b;
}
public static void main(String[] args) {
sayHello(); // calling void method
int sum = add(5, 10); // calling return method
System.out.println("Sum: " + sum);
}
}
Explanation: sayHello() prints directly. add() returns the sum of two numbers, which we store in a variable and print.
3. Why use Methods?
- Avoids code repetition
- Makes programs easier to read
- Helps in breaking large programs into smaller tasks
Summary
Methods are reusable code blocks. void methods perform an action without returning data, while other methods can return values for further use.
