Java Generics

java_generics.md

Terms

• Generic Type
• Generic Method
• Type Parameter
• Type Argument
• Parameterized Type
• Type Erasure
• Wildcard (?)

Example

class GenericType <TypeParameter1 (extends | super Bound+)?> {
    TypeParameter1 field;
    
    public int genericMethod1 (TypeParameter1 t) {
        return 0;
    }
    
    public <TypeParameter2 (extends | super Bound+)?> int genericMethod2 (TypeParameter2 t) {
        return 0;
    }
    
    public int genericMethod3 (GenericType <? (extends | super Bound+)?> t) {
        return 0;
    }
}

GenericType <TypeArgument> instanceOfParameterizedType = new GenericType <> ();