Transcription of More than you ever wanted to know about Java Generics
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More than you ever wanted to know about Java Generics
more than you ever wanted to know about Java Generics Jeff Meister CMSC 420 Summer 2007 Generics : A YOUNG LADY S ILLUSTRATED PRIMER IN FOUR SLIDES The obligatory review of the boring stuff, Java : Life Before Generics Java code used to look like this: List listOfFruits = new ArrayList(); (new Fruit( Apple )); Fruit apple = (Fruit) (0); (new Vegetable( Carrot )); // Whoops! Fruit orange = (Fruit) (0); // Run time error Problem: Compiler doesn t know listOfFruits should only contain fruits A Silly SoluMon We could make our own fruit only list class: class FruitList { void add(Fruit element) { .. } Fruit remove(int index) { .. } .. } But what about when we want a vegetable only list later? Copy paste? Lots of bloated, unmaintainable code? Java : Now We re Talking Now, Java code looks like this: List<Fruit> listOfFruits = new ArrayList<Fruit>(); (new Fruit( Apple )); Fruit apple = (0); (new Vegetable( Carrot )); // Compile time error Hooray!
More than you ever wanted to know about ... than you were without using generics at all. At least you know the code on your ...
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