傳統方式下，對集合判段

public static void main(String[] args) {
        List<Boolean> list = new ArrayList<Boolean>();
        list.add(true);
        list.add(false);
        for(Boolean b : list){
            System.out.println(b);
        }

        /*
        int stringNum = 0,integerNum=0,booleanNum = 0;
        List list = new ArrayList();
        list.add("jack");
        list.add("marry");
        list.add("sisi");
        list.add(100);
        list.add(200);
        list.add(true);
        Iterator it = list.iterator();
        while(it.hasNext()){
            Object obj = it.next();
            if(obj instanceof String){
                stringNum++;
            }else if(obj instanceof Integer){
                integerNum++;
            }else if(obj instanceof Boolean){
                booleanNum++;
            }
        }
        System.out.println("stringNum="+stringNum);
        System.out.println("integerNum="+integerNum);
        System.out.println("booleanNum="+booleanNum);
        */
    }