Object-Oriented Data-Structures - A Concise and Practical Introduction to Programming Algorithms in Java - page 179

We can remove all static functions from the scope of the List body and attach
them to, say, a general-purpose class called Toolbox as follows:

Program 8.7 Linked list with static functions attached to a Toolbox class
class List
int container ;
List next ;

// Constructor List(head, tail)
List( int element , List tail )

{ this .container=element;

this .next=tail; }

}

class Toolbox {
static int head( List l i s t )
{ return list . container ; }

static List insert ( int s , List list )

{ return new List(s , list ) ; }

Then we could have created linked lists and called various related static
functions by invoking static functions of the Toolbox class. For example, let us
consider the following code snippet:

class List
int container ;
List next ;

// Constructor List(head, tail)
List( int element , List tail )
{ this .container=element;
this .next=tail; }

}

class Toolbox {

static int head( List l i s t )
{ return list . container ; }

static List insert ( int s , List list )

{ return new List(s , list ) ; }

}

class StaticFunction
{ public

static void main( String [ ] args )

{ List myList= new List (3, null );
myList=Toolbox . insert (6 , Toolbox . insert (4 , myList) ) ;