Functions and Recursive Functions - A Concise and Practical Introduction to Programming Algorithms in Java - page 59

public static void main( String [ ] arguments )

{ ... }

}

Let us see some concrete examples.

3.2.2 Examples of basic functions

Let us create a demonstration program class FunctionDeclaration by typing
in the FunctionDeclaration.java text file the following code:

Program 3.2 A basic demonstration class for defining and calling static

functions
class FunctionDeclaration {

static int square( int x)
{ return x ∗ x; }

static boolean isOdd( int p)
{ if ( ( p%2)==0) return false ;
else return true ; }

static double distance( double x, double y)
{ if (x > y) return x − y;
else return y − x; }

static void display( double x, double y)
{ System . out . println ( "(" +x+ "," +y+ ")" );
return ; // return void

}

public static void main ( String [ ] args )

{ display (3 ,2) ;
display(square(2) ,distance (5 ,9)) ;

int p=123124345;
if (isOdd(p) )
System . out . println ( "p is odd" );
else System . out . println ( "p is even" );

}

}

Compiling and executing this code, we get:

(3.0,2.0)
(4.0,4.0)
pisodd