PrintDemo.java.html

  1  import java.awt.Color;
  2  
  3  /** 
  4     This class demonstrates a generic method for printing arrays.
  5  */
  6  public class PrintDemo
  7  {
  8     public static <E> void print(E[] a)
  9     {
 10        for (E e : a)
 11        {
 12           System.out.print(e + " ");
 13        }
 14        System.out.println();
 15     }
 16  
 17     public static void print(int[] a)
 18     {
 19        for (int e : a)
 20        {
 21           System.out.print(e + " ");
 22        }
 23        System.out.println();
 24     }
 25  
 26     public static void main(String[] args)
 27     {
 28        String[] words = { "Mary", "had", "a", "little", "lamb" };
 29  
 30        Color[] colors = { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW };
 31  
 32        int[] squares = { 1, 4, 9, 16, 25, 36 };
 33  
 34        print(words); // Calls print<String>
 35        print(colors); // Calls print<Color>
 36        print(squares); // Calls non-generic print      
 37     }
 38  }