Sometimes we need to convert InputStream to byte array in Java, or you can say reading InputStream as byte array, In order to pass output to a method which accept byte array rather than InputStream. One popular example of this, I have seen is older version of Apache commons codec, while converting byte array to hex string. Though, later version of same library do provide an overloaded method, to accept InputStream. Java File API provides excellent support to read files like image, text as InputStream in Java program, but as I said, sometime you need need String or byte array, instead of InputStream . Earlier we have seen 5 ways to convert InputStream to String in Java , we can use some of the techniques from there while getting byte array from InputStream in Java. If you like to use Apache commons library, which I think you should, there is a utility class called IOUtils, which can be used to easily convert InputStream to byte array in Java. If you don't like using open source library for such kind of thinks, and like to write your own method, you can easily do so by using standard Java File API. In this Java tutorial we will see examples of both ways to convert InputStream to byte array in Java.
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5 ways to check if String is empty in Java examples
String in Java is considered empty if its not null and it’s length is zero. By the way before checking length you should verify that String is not null because calling length() method on null String will result in java.lang.NullPointerException. Empty String is represented by String literal “”. Definition of empty String may be extended to those String as well which only contains white space but its an specific requirement and in general String with white space are not considered as empty String in Java. Since String is one of the most frequently used class and commonly used in method arguments, we often needs to check if String is empty or not. Thankfully there are multiple ways to find if String is empty in Java or not. You can also count number of characters in String, as String is represented as character arrayand decide if String is empty or not. If count of characters is zero than its an empty String. In this Java String tutorial we going to see 5 ways to find if any String in Java is empty or not. Here are our five ways to check empty String :
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