增强For循环（foreach）

for (Type value : array) {
    	expression value;
}

public class ForeachDemo01 {

    public static void main(String args[]){
        //for
        int[] array = {1,2,5,8,9};
        int total = 0;
        for (int i = 0; i < array.length; i++){
            total += array[i];
        }
        System.out.println(total);

        //foreach
        total = 0;
        for (int n : array) {
            total += n;
        }
        System.out.println(total);
    }
}

for (Type value : Iterable) {
    	expression value;
}

public class ForeachDemo02 {
    public static void main(String[] args) {
        someFunction01();
        someFunction02();
    }
    //以前我们这样写：
    static void someFunction01(){
        List list = new ArrayList();
        list.add("Hello ");
        list.add("Java ");
        list.add("World!");
        String s = "";
        for (Iterator iter = list.iterator(); iter.hasNext();){
            String temp= (String) iter.next();
            s += temp;
        }
        System.out.println(s);
    }
    //现在我们这样写：
    static void someFunction02(){
        List list = new ArrayList();
        list.add("Hello ");
        list.add("Java ");
        list.add("World!");
        String s = "";
        for (Object o : list){
            String temp = (String) o;
            s += temp;
        }
        System.out.println(s);
    }
}