Java Method Parameters

Method parameters are values you pass to a method when calling it. They allow methods to receive input and perform operations with dynamic data.

1. Types of Parameters

No Parameters – The method does not require any input.
Single Parameter – The method accepts one input.
Multiple Parameters – The method accepts two or more inputs.
Variable-Length Parameters (Varargs) – The method accepts any number of arguments of the same type.

2. Example 1: No Parameters

📌 Output:

3. Example 2: Single Parameter

📌 Output:

4. Example 3: Multiple Parameters

📌 Output:

5. Example 4: Variable-Length Arguments (Varargs)

public class Main {
static int sumNumbers(int... numbers) {
int sum = 0;
for (int num : numbers) {
sum += num;
}
return sum;
}

public static void main(String[] args) {
System.out.println(sumNumbers(1, 2, 3)); // 6
System.out.println(sumNumbers(10, 20, 30, 40)); // 100
}
}

public class Main {

static int sumNumbers(int... numbers) {

int sum = 0;

for (int num : numbers) {

sum += num;

}

return sum;

}

public static void main(String[] args) {

System.out.println(sumNumbers(1, 2, 3)); // 6

System.out.println(sumNumbers(10, 20, 30, 40)); // 100

}

📌 Notes:

int... numbers → Accepts 0 or more integers
Varargs must be last parameter if multiple parameters exist

6. Example 5: Passing Array as Parameter

public class Main {
static int sumArray(int[] arr) {
int sum = 0;
for (int num : arr) {
sum += num;
}
return sum;
}

public static void main(String[] args) {
int[] numbers = {10, 20, 30, 40};
System.out.println("Sum = " + sumArray(numbers));
}
}

public class Main {

static int sumArray(int[] arr) {

int sum = 0;

for (int num : arr) {

sum += num;

}

return sum;

}

public static void main(String[] args) {

int[] numbers = {10, 20, 30, 40};

System.out.println("Sum = " + sumArray(numbers));

}

📌 Output:

🧠 Key Points

Parameters allow methods to receive dynamic input.
Can be of primitive type, objects, arrays, or varargs.
Order matters when calling a method with multiple parameters.
Varargs provide flexibility for any number of arguments.

Java Method Parameters