A simple generic class hierarchy.

   
/*
Java 2, v5.0 (Tiger) New Features
by Herbert Schildt
ISBN: 0072258543
Publisher: McGraw-Hill/Osborne, 2004
*/

class Gen<T> {  
  T ob; 
    
  Gen(T o) {  
    ob = o;  
  }  
  
  // Return ob.  
  T getob() {  
    return ob;  
  }  
}  
 
// A subclass of Gen that defines a second 
// type parameter, called V. 
class Gen2<T, V> extends Gen<T> { 
  V ob2; 
 
  Gen2(T o, V o2) { 
    super(o); 
    ob2 = o2; 
  } 
 
  V getob2() { 
    return ob2; 
  } 
} 
  
// Create an object of type Gen2. 
public class HierDemo {  
  public static void main(String args[]) {  
    
    // Create a Gen2 object for String and Integer. 
    Gen2<String, Integer> x = 
      new Gen2<String, Integer>("Value is: ", 99);  
 
    System.out.print(x.getob()); 
    System.out.println(x.getob2()); 
  }  
}

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A simple generic class hierarchy. : Generic Class « Generics « Java

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