Data structure and collections: Modern, generics version.

   
/*
Java 2, v5.0 (Tiger) New Features
by Herbert Schildt
ISBN: 0072258543
Publisher: McGraw-Hill/Osborne, 2004
*/
 
import java.util.*; 
 
public class NewStyle {  
  public static void main(String args[]) { 
 
    // Now, list holds references of type String. 
    ArrayList<String> list = new ArrayList<String>(); 
 
    list.add("one"); 
    list.add("two"); 
    list.add("three"); 
    list.add("four"); 
 
    // Notice that Iterator is also generic. 
    Iterator<String> itr = list.iterator(); 
 
    // The following statement will now cause a compile-time eror. 
//    Iterator<Integer> itr = list.iterator(); // Error! 
 
    while(itr.hasNext()) { 
      String str = itr.next(); // no cast needed 
 
      // Now, the following line is a compile-time, 
      // rather than runtime, error. 
//    Integer i = itr.next(); // this won't compile 
 
      System.out.println(str + " is " + str.length() + " chars long."); 
    } 
  }  
}

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Data structure and collections: Modern, generics version. : Generic Collection « Generics « Java

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