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package chapter9;

import java.util.Iterator;

/**

* 使用增强式for

*/

class IterableString implements Iterable<Character> {

private String str;

IterableString(String str) {

this.str = str;

}

@Override

public Iterator<Character> iterator() {

return new Iterator<Character>() {

private int index = 0;

public boolean hasNext() {return index < str.length();}

public Character next() { return str.charAt(index++); }

public void remove() {

throw new UnsupportedOperationException();

}

};

}

public static void main(String[] args) {

IterableString is = new IterableString("Hello");

for (Character c: is) {

System.out.println(c);

}

}

}