Efficient way to keep referencing a class in multiple linked java classes? -

suppose in eclipse have 3 packages following classes in each:

packages: classes

head: head.java

body: arms.java

legs: feet.java

i want define class info in brain.java , pass through methods other classes (arms.java , feet.java) , update contents of info.

class info {     // vars such bools,ints,strings } 

for example, have updatearms method defined in arms.java. want following in brain.java:

arms.updatearms( info ); 

i having trouble finding how first define class behaves way, , secondly how pass parameter linked class.

first, should learn java naming convention.

for example, package should head, , class should head.

go design: in oop, see program interactions between object instances.

in example, may like:

class arm {     void moveup(someinfo info) {         ...     } }  class brain {     private arm leftarm;     private arm rightarm;      void reachforward() {         rightarm.moveup(...);     }      void connectleftarm(arm arm) {         this.leftarm = arm;     }     //.... }  class body {     brain brain;     arm leftarm;     arm rightarm;     public body() {         this.brain = new brain();         this.leftarm = new arm();         this.rightarm = new arm();         this.brain.connectleftarm(this.leftarm);         this.brain.connectrightarm(this.rightarm);     } } 

i wish demonstrate difference of way of thinking.

if start used way oop see things, can take next step in refining design (e.g. different design pattern)