Java Method Parameters
Method parameters allow you to pass data into methods. They act as variables within the method and are used to receive values when the method is called.
1. Defining Parameters
Parameters are defined in the method declaration inside the parentheses, specifying the type and name for each parameter.
public void greet(String name) {
System.out.println("Hello, " + name);
}
2. Calling Methods with Arguments
When calling a method with parameters, you need to provide arguments that match the parameters in type and order.
greet("Alice"); // Outputs: Hello, Alice
3. Multiple Parameters
Methods can have multiple parameters, separated by commas.
public int add(int a, int b) {
return a + b;
}
int sum = add(5, 10); // sum = 15
4. Parameter Passing
Java uses pass-by-value for parameter passing, meaning a copy of the variable is passed to the method. Changes to the parameter within the method do not affect the original variable.
Key Takeaways
- Parameters allow methods to receive input data.
- Define parameters in the method declaration with type and name.
- Arguments provided during method calls must match parameters in type and order.
- Understand the concept of pass-by-value in Java.