Check out example codes for "function in java". It will help you in understanding the concepts better.

Code Example 1

public class Main
{
    static void function(){
        System.out.println("I am a function!");
    }
	public static void main(String[] args) {
		function();
	}
}

Code Example 2

public class MyClass {
  private int value = 10;
  // getter method
  public int getValue() {
    return value;
  }
  // setter method
  public void setValue(int value) {
    this.value = value;
  }
}

Code Example 3

//declare a function like this:
void function(int parameter1)
{
	//function body
}
//call the function like this:
function(1);

Code Example 4

public static void main(String[] args)
{
	int length=getLength();
  	System.out.println("Your length is: "+length);
}
//methods are outside of main method
public static int getLength()
{
	int length=5;
  	return length;
}

Code Example 5

public int addNum(int num1, int num2) {
  total = num1 + num2;
  System.out.println("Total: " + total);
}

Learn ReactJs, React Native from akashmittal.com