ItemStack stack1 = new ItemStack(Items.DIAMOND, 1); // Create a new item stack with 1 diamond ItemStack stack2 = new ItemStack(Items.DIAMOND, 1); // Create another stack with 1 diamond if (ItemStack.areItemStacksEqual(stack1, stack2)) { System.out.println("The two stacks are equal!"); // This will be printed since the two stacks have the same item type and quantity }In this example, the areItemStacksEqual() method is used to compare the two item stacks `stack1` and `stack2`. Since they both have one diamond and no additional data, the method returns true and the message "The two stacks are equal!" is printed. The `net.minecraft.item` package is a part of the Minecraft game's library.