MaxDemo.java.html

  1  import java.awt.Color;
  2  
  3  public class MaxDemo
  4  {
  5     public static <E extends Comparable> E max(E[] a)
  6     {
  7        E largest = a[0];
  8        for (int i = 1; i < a.length; i++)
  9        {
 10           if (a[i].compareTo(largest) > 0) 
 11           {
 12              largest = a[i];
 13           }
 14        }
 15        return largest;
 16     }
 17  
 18     public static void main(String[] args)
 19     {
 20        String[] words = { "Mary", "had", "a", "little", "lamb" };
 21  
 22        Color[] colors = { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW };
 23  
 24        Integer[] squares = { 1, 4, 9, 16, 25, 36 };
 25  
 26        System.out.println(max(words)); // Calls max<String>
 27        // System.out.println(max(colors)); // Error: Color is not Comparable
 28        System.out.println(max(squares)); // Calls max<Integer>
 29     }
 30  
 31  }