Demonstrate a simple generic method.

/*
Java 2, v5.0 (Tiger) New Features
by Herbert Schildt
ISBN: 0072258543
Publisher: McGraw-Hill/Osborne, 2004
*/
 
public class GenMethDemo {  
 
  // Determine if an object is in an array. 
  static <T, V extends T> boolean isIn(T x, V[] y) { 
 
    for(int i=0; i < y.length; i++) 
      if(x.equals(y[i])) return true; 
 
    return false; 
  } 
 
  public static void main(String args[]) {  
 
    // Use isIn() on Integers. 
    Integer nums[] = { 1, 2, 3, 4, 5 }; 
 
    if(isIn(2, nums)) 
      System.out.println("2 is in nums"); 
 
    if(!isIn(7, nums)) 
      System.out.println("7 is not in nums"); 
 
    System.out.println(); 
 
    // Use isIn() on Strings. 
    String strs[] = { "one", "two", "three", 
                      "four", "five" }; 
 
    if(isIn("two", strs)) 
      System.out.println("two is in strs"); 
 
    if(!isIn("seven", strs)) 
      System.out.println("seven is not in strs"); 
 
    // Opps! Won't compile! Types must be compatible. 
//    if(isIn("two", nums)) 
//      System.out.println("two is in strs"); 
  }  
}

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Demonstrate a simple generic method. : Generic Method « Generics « Java

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