把一个集合按指定大小分组

public static <T> List<List<T>> partition(final List<T> list, final int size) {
        if (list == null) {
            throw new IllegalArgumentException("List must not be null");
        }
        if (size <= 0) {
            throw new IllegalArgumentException("Size must be greater than 0");
        }
        List<List<T>> result = new ArrayList<>();
        Iterator<T> it = list.iterator();
        List<T> subList = null;
        while(it.hasNext()) {
        	if(subList == null) {
        		subList = new ArrayList<>();
        	}
        	T t = it.next();
        	subList.add(t);
        	if(subList.size() == size) {
        		result.add(subList);
        		subList = null;
        	}
        }
        //补充最后一页
        if(subList != null) {
        	result.add(subList);
        }
        return result;
    }

 

上面的算法，

其实用这个方法可以代替：

org.apache.commons.collections4.ListUtils.partition(final List<T> list, final int size);