java递归如何退出_递归删除数组某个元素

###Java递归删除文件

public static void main(String[] args) {

File file = new File(“D:\\dir”);

recursiveDelete(file);

}

###recursiveDelete方法

private static void recursiveDelete(File file) {

if (file.isDirectory()) {

File[] list = file.listFiles();

for (File f : list) {

recursiveDelete(f);

}

// 删除完文件夹内的文件后删除自身

file.delete();

} else {

file.delete();

}

}

###=================================================================== ###同理，递归删除数据库里的商品目录

public int deleteGoodsCategory(Long goodsCategoryId) {

return recursive(goodsCategoryId);

}

private int recursive(Long goodsCategoryId) {

int r = 0;//此统计结果不准确

if (hasSubCategory(goodsCategoryId)) {

//删除子类目

List list = goodsCategoryDao.selectSubGoodsCategory(goodsCategoryId);

for (GoodsCategory g : list) {

recursive(g.getId());

}

goodsCategoryDao.deleteByPrimaryKey(goodsCategoryId);//删除完子类目后删除自身

r++;

} else {

goodsCategoryDao.deleteByPrimaryKey(goodsCategoryId);

r++;

}

return r;

}

public boolean hasSubCategory(Long goodsCategoryId) {

return goodsCategoryDao.hasSubCategory(goodsCategoryId) > 0;

}

###goodsCategoryDao

int deleteByPrimaryKey(Long id);

//delete from xy_goods_category where id = #{id}

int hasSubCategory(Long goodsCategoryId);

// select count(1) from xy_goods_category where parent_id = #{goodsCategoryId}

/**

* 某个目录的子目录列表

*/

List selectSubGoodsCategory(Long goodsCategoryId);

// select * from xy_goods_category where parent_id = #{goodsCategoryId}