Let's take an example of a date and time object to understand how we can check a null date or datetime object. Java Character class provides a MIN_VALUE constant that represents the minimum value for a character instance. A place where magic is studied and practiced? First, check whether the given String is not null and not empty otherwise return false Once after the given String passes above validation then get Stream using CharSequence.chars () method validate each characters iterated by passing to Character.isLetter ( ch) method to check whether passed character is Letter / Alphabet only If null, return false. Did you write the encryption yourself, or are you using standard encryption algorithms? How do I generate random integers within a specific range in Java? Refer to the API documentation for all the public info on Strings. 3.1. Join our newsletter for the latest updates. This makes it explicit to the client code whether the annotated type can be null or not. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? And you check it for two conflictings types - it can't be a char ('\0') and a char pointer (NULL) at the same time. By using our site, you A blank string is a string that has whitespace as its value. Reach out to all the awesome people in our software development community by starting your own topic. That would not be a "C string" - actually not a string at all (and very inefficient, too). Since you have a space there. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. In Java, the minimum value is a \u0000 that can be obtained using the MIN_VALUE constant of the Character class and can be assigned to any char variable to create an empty char. From your code it seems like you work with Unicode and the method you search for is into Character class (java.lang), It also contains lots of useful static method that can suite you. What am I doing wrong here in the PlotLegends specification? That's all you need to know. We can check out Character.isWhitespace for examples. We must not confuse space char with empty char as both are different, and Java treats them differently. How can I find out which sectors are used by files on NTFS? a string with white spaces str3. if index returns -1, then null character is not found. How can I determine if a variable is 'undefined' or 'null'? So you guys are saying in Java there is no way to check if my_char_array[i]!= NULL. Top 50 Array Coding Problems for Interviews, Introduction to Stack - Data Structure and Algorithm Tutorials, Prims Algorithm for Minimum Spanning Tree (MST), Practice for Cracking Any Coding Interview, Program to check if the String is Empty in Java, Types of JVM Garbage Collectors in Java with implementation details, We can simply compare the string with Null using. A place where magic is studied and practiced? Research source, Keep up with the latest tech with wikiHow's free Tech Help Newsletter. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/23\/Check-Null-in-Java-Step-1-Version-2.jpg\/v4-460px-Check-Null-in-Java-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/2\/23\/Check-Null-in-Java-Step-1-Version-2.jpg\/aid1050598-v4-728px-Check-Null-in-Java-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":348,"bigWidth":728,"bigHeight":551,"licensing":"