// Using a for-each for loop on an Iterable object. 
import java.util.*; 
 
// This class supports iteration of the  
// characters that comprise a string. 
class StrIterable implements Iterable<Character>, 
                             Iterator<Character> { 
  private String str; 
  private int count = 0; 
 
  StrIterable(String s) { 
    str = s; 
  } 
 
  // The next three methods impement Iterator. 
  public boolean hasNext() { 
    if(count < str.length()) return true; 
    return false; 
  } 
 
  public Character next() { 
    if(count == str.length())  
      throw new NoSuchElementException(); 
 
    count++; 
    return str.charAt(count-1); 
  } 
 
  public void remove() { 
    throw new UnsupportedOperationException(); 
  } 
 
  // This method implements Iterable. 
  public Iterator<Character> iterator() { 
    return this; 
  } 
} 
 
class ForEachIterable {  
  public static void main(String args[]) {  
    StrIterable x = new StrIterable("This is a test."); 
 
    // Show each character. 
    for(char ch : x) 
      System.out.print(ch); 
 
    System.out.println(); 
      
  }  
}