tools: (JAVA, JUnit)

I recently developed a JAVA code about dining philosopher problem.

But I have no idea hot to make an unit test.

Can someone help me to figure out how to make a unit test of following code?

code:

package diningphilosopher;

/** * * @author DixinSun */ import java.util.Random; import java.util.Scanner; public class DiningPhilosopher { Philosopher[] philosophers; Fork[] forks; Thread[] threads; Scanner scan; int number; public static void main(String[] args) { DiningPhilosopher obj = new DiningPhilosopher(); obj.init(); obj.ThinkingOrEating(); } public void init(){ scan = new Scanner(System.in); try{ System.out.println("enter the number of philosophers"); number = scan.nextInt(); if(number < 2){ System.out.println("Number sohuld > 1."); return; } }catch(Exception e){ System.out.println("Number sohuld be interger."); } philosophers = new Philosopher[number]; forks = new Fork[number]; threads = new Thread[number]; for(int i = 0; i < number; i++){ philosophers[i] = new Philosopher(i + 1); forks[i] = new Fork(i + 1); } } public void ThinkingOrEating(){ for(int i = 0; i < number; i++){ final int index = i; threads[i] = new Thread(new Runnable(){ public void run(){ try { philosophers[index].start(forks[index],(index - 1 > 0) ? forks[index - 1]: forks[number - 1]); }catch (InterruptedException e){ e.printStackTrace(); } } }); threads[i].start(); } } public class Fork{ private int forkId; private boolean status; Fork(int forkId){ this.forkId = forkId; this.status = true; } public synchronized void free()throws InterruptedException{ status = true; } public synchronized boolean pick(int philosopherId) throws InterruptedException { int counter = 0; int waitUntil = new Random().nextInt(10) + 5; while(!status){ Thread.sleep(new Random().nextInt(100) + 50); counter++; if(counter > waitUntil){ return false; } } status = false; return true; } } public class Philosopher{ private int philosopherId; private Fork left,right; public Philosopher(int philosopherId){ this.philosopherId = philosopherId; } public void start(Fork left, Fork right) throws InterruptedException{ this.left = left; this.right = right; while(true){ if(new Random().nextBoolean()){ eat(); }else{ think(); } } } public void think() throws InterruptedException{ System.out.println("The Philosopher:" + philosopherId + " is thinking."); Thread.sleep(new Random().nextInt(1000) + 100); System.out.println("The Philosopher:" + philosopherId + " stopped thinking."); } public void eat() throws InterruptedException{ boolean rightPick = false; boolean leftPick = false; System.out.println("The Philosopher:"+philosopherId + "hungry."); System.out.println("The Philosopher:"+philosopherId + "pick up the fork:" + left.forkId); leftPick = left.pick(philosopherId); if(!leftPick){ return; } System.out.println("The philosopher:" + philosopherId +"pick up the fork:" + right.forkId); rightPick = right.pick(philosopherId); if(!rightPick){ left.free(); return; } System.out.println("The philosopher:" + philosopherId + " is now eating."); Thread.sleep(new Random().nextInt(1000)+100); left.free(); right.free(); System.out.println("The philosopher:"+ philosopherId + "put down the forks."); } } }