The resource adapter might use this method to check that numeric properties are within the acceptable range or to ensure that a string property representing a value from an enumeration is valid.
资源适配器可能用这个方法检查算术属性是否在可以接受的范围之内，或者确保表示枚举值的字符串有效。
2
Then check to see whether the page counter is within the requested range of pages, and if so, write the current line; otherwise do not write.
然后检查页计数器是否在请求的页范围之内，若是，则写当前行；否则不写。
3
Check the oil level on the dipstick, making sure the level is in the proper range.