Generics

In Java 5 , Generics features is introduce in Java language. A generic type is a generic interface or class that is parameterized over types.

Non Generic class

class JavaOops {

  private Object obj;

 public void set(Object obj) {

  this.obj = obj;

 }

 public Object get() {

  return obj;

 }

}

Generic class : we have replaced Object by T and add in class <T>. when we define a generic class then we will define like class name<T1,T2 ....Tn> { } and same can define in interfaces like interface name<T1,T2,..Tn>

class JavaOops<T> {

  private T type;

 public void set(T type) {

  this.type = type;

 }

 public T get() {

  return type;

 }

}

Some of stranded type parameter name

• E - Element
• K - Key
• N - Number
• T - Type
• V - Value