Reflection - Get a instance of Item stored in Item

Code:

    public static Item STONE_PICKAXE = (new ItemPickaxe(18, EnumToolMaterial.STONE)).b(1, 6).b("pickaxeStone");

There is plenty of lines for each of these items.
And rather then coding each one in I need/want to get a list of them each.

The problem being I have never worked with reflection, Have no idea if this is the correct way.

Code:

    try {
      Method method = net.minecraft.server.Item.class.getDeclaredMethod("a",
          boolean.class);
      if (method.getReturnType() == net.minecraft.server.Item.class) {
        method.setAccessible(true);
        Field[] list = net.minecraft.server.Item.class.getDeclaredFields();
        for (Field field : list) {
          String type = field.getType().getName();
          if (type.equals("net.minecraft.server.Item")
              || type.equals("net.minecraft.server.ItemShears")) {
            method.invoke(field, false);
            System.out.println("Success");
          }
        }
      }

    } catch (Exception e) {
      System.out.println(e);
    }

You will probably find problems with this.

Basically, How would I get the instance "Item STONE_PICKAXE"

 

You can simply use Item.byId[<id here>]

 

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Thanks!