void methods

Learn valueless methods with void.

void methods

Some methods do not return a value; they just do an action. These are called void methods. The return statement is either omitted or written without a value.

static void printLine(String text) {
  System.out.println("--- " + text + " ---");
}

To exit a void method early, you can write return;. This is handy when you want to end the method as soon as a condition is met.

Early exit in void methods

Inside a void method you can write return; to leave the flow immediately. This is handy for skipping unnecessary work.

static void logIfPositive(int n) {
  if (n <= 0) return;
  System.out.println("Positive: " + n);
}

Here, when n is negative or zero, the method prints nothing. This pattern avoids deep nested if blocks and keeps the code readable.

Exercise Write a greeting method

Define a static void method called greet; parameter String name, body System.out.println("Selam " + name). Call greet("Ayşe") and greet("Mehmet") from main.

Show example solution

static void greet(String name) {
  System.out.println("Hello " + name);
}
// inside main:
greet("Ayşe");
greet("Mehmet");

Test yourself

Fill in the blank: return type

static ____ printHello() {
  System.out.println("Hello");
}

Show answer

static void printHello() {
  System.out.println("Hello");
}

Match scenario to return type

Print text to the screen

void
Product of two numbers

int
Average (decimal)

double
Is this user an admin?

boolean
What happens if we try to return a value from a void method?
- It causes a compile error
- It throws at runtime
- The value is auto-converted to void
- The value is ignored
Show answer

It throws at runtime — A void method cannot return a value; it is a compile error.

Next lesson: Method overloading

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