java - The threads are not sharing the same data variable -

i'm new java. teacher gave me homework on multithreading in there 2 threads example , example1. example makes changes thread, , example1 reads it. when i'm implementing example1 thread not working properly.

example thread :

public class example extends thread {     public int[] array = {2,1,0,5,9};     public void run(){         for(int i=0; i<array.length;i++){             array[i] = array[i]+i;             system.out.println(getname()+" : "+array[i]);         }     } } 

example1 thread :

public class example1 extends example implements runnable {      @override     public void run(){         for(int i=0;i<array.length;i++){             system.out.println(getname()+" : "+array[i]);         }     } } 

the main :

public class testexample {      public static void main(string[] args) {         example t1 = new example();         t1.setname("t1");         t1.start();          example1 obj = new example1();         thread t2 = new thread(obj);         t2.setname("t2");         t2.start();     }  } 

and output :

t1 : 2 t1 : 2 t1 : 2 t1 : 8 t1 : 13 thread-1 : 2 thread-1 : 1 thread-1 : 0 thread-1 : 5 thread-1 : 9 

thread example1 unable read changed values in int[] array when example has made changes int[] array. problem , how rectify it?

just make int[] array static.

public static int[] array = {2,1,0,5,9}; 

output :

t1 : 2 t1 : 2 t1 : 2 t1 : 8 t1 : 13 t2 : 2 t2 : 2 t2 : 2 t2 : 8 t2 : 13