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| 9. 34. 4. Creating Iterable Objects: using a for-each for loop on an Iterable object |
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import java.util.Iterator;
import java.util.NoSuchElementException;
// This class supports iteration of the
// characters that comprise a string.
class IterableString implements Iterable<Character>, Iterator<Character> {
private String str;
private int count = 0;
public IterableString(String s) {
str = s;
}
// The next three methods implement 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;
}
}
public class MainClass {
public static void main(String args[]) {
IterableString x = new IterableString("This is a test.");
for (char ch : x){
System.out.println(ch);
}
}
}
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