自定義一個迭代器

package cn.itcast.jdk15;

import java.util.Iterator;

//自定一個類使用加強for循環
class MyList implements Iterable<String>{

Object[] arr = new Object[10];

int index = 0 ; //當前的指針

public void add(Object o){
arr[index++] = o; // 1
}

public int size(){
return index;
}

@Override
public Iterator<String> iterator() {


return new Iterator<String>() {

int cursor = 0;

@Override
public boolean hasNext() {
return cursor<index;
}

@Override
public String next() {
return (String) arr[cursor++];
}

@Override
public void remove() {

}
};
}
}

public class Demo3 {

public static void main(String[] args) {
MyList list = new MyList();
list.add("張三");
list.add("李四");
list.add("王五");

for(String item :list){
System.out.println(item);
}



}

}