Java api
public interface Iterable<T>
Implementing this interface allows an object to be the target of the "for-each loop", see java api
Example
public class IterableString implements Iterable<Character> {
private String original;
public IterableString(String original) {
this.original = original;
}
public Iterator<Character> iterator() {
return new Iterator<Character>(){
private int index;
public boolean hasNext() {
return index < original.length();
}
public Character next() {
return Character.valueOf(original.charAt(index++));
}
public void remove() {}
}; // end of return statement
}
}
you can use for-each to iterate character like this.
for(Character c : str) {
System.out.println(c);
}
if you decompile this java code, you will see the compiler do this thing.
Character c;
for(Iterator iterator = str.iterator(); iterator.hasNext();
System.out.println(c))
c = (Character)iterator.next();
