Please comment every line of Java data structure code I give.( Java Data Structures).

public void push(T item) throws IllegalStateException { if (count > stack.length-1) { System.out.println("Stack is full."); throw new IllegalStateException(); } else { stack[count] = item;

count++; } }

public T pop() { if (count == 0) { System.out.println("Stack underflow."); return null;

} else { T item = stack[count - 1]; stack[count - 1] = null;