The reason is simple: The Java compiler was refactored to use erasure so that generic code could interoperate with legacy Java code, which isn’t generic (reference types cannot be parameterized).

The next screen snapshot shows how I can use NetBeans 7.2 to accomplish this by hovering over the parameterized constructor, right-clicking on it, and selecting the option “Replace constructor ...

Copy constructors. Parameterized constructors. No-args constructors. Non-default constructors. However, technically all of these are subtypes of the 10 Java constructor types listed above. Cameron ...