Why compiler says that " possible lossy conversion from int to byte" for this java code ? : <p>When I tried to run this code in an online java compiler it says "<strong>possible lossy conversion from int to byte</strong>". But i can't understand the meaning of this message. Badly need help. I am a beginner at Java.  </p>

<pre><code>class HelloWorld{   
         public static void main(String args[]){
             byte b=9;
             b+=6;
             System.out.println(b);
             b=b+5;
             System.out.println(b);
         }
    }
</code></pre>
