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- // A simple generic class
- // Here, T is a type parameter that
- // will be replaced by a real type
- // when an object of type Gen is created.
- class Gen<T> {
- T ob; // declare an object of type T
- // Pass the constructor a reference to an object of type T.
- Gen(T o) {
- ob = o;
- }
- // Return ob.
- T getob() {
- return ob;
- }
- // Show type of T.
- void showType() {
- System.out.println("Type of T is " + ob.getClass().getName());
- }
- }
- // Demonstrate the generic class.
- public class GenDemo {
- public static void main(String[] args) {
- // Create a Gen reference for Integers.
- Gen<Integer> iOb;
- // Create a Gen<Integer> object ans assign its reference to iOb.
- // Notice the use of autoboxing to encapsulate the value 88
- // whithin an Integer object.
- iOb = new Gen<Integer>(88);
- // Show the type of data used by iOb.
- iOb.showType();
- // Get the value in iOb.
- // Notice that no cast is needed.
- int v = iOb.getob();
- System.out.println("value: " + v);
- System.out.println();
- // Create a Gen object for Strings.
- Gen<String> strOb = new Gen<String>("Generics Test");
- // Show the type of data used by strOb.
- strOb.showType();
- // Get the value of strOb.
- // Again, notice that no cast is needed.
- String str = strOb.getob();
- System.out.println("value: " + str);
- }
- }
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