SHA-256 is a cryptographic (one-way) hash function, so there is no direct way to decode it. The entire purpose of a cryptographic hash function is that you can’t undo it. One thing you can do is a brute-force strategy, where you guess what was hashed, then hash it with the same function and see if … Read more
Is there any standard Java library class to represent a tree in Java? Specifically I need to represent the following: The sub-tree at any node can have an arbitrary number of children Each node (after the root) and it’s children will have string value I need to get all the children (some sort of list … Read more
Easiest route is probably upgrading or re-installing the Java Runtime Environment (JRE). Or this: Open the Windows Explorer, from the Tools select ‘Folder Options…’ Click the File Types tab, scroll down and select JAR File type. Press the Advanced button. In the Edit File Type dialog box, select open in Actions box and click Edit… … Read more
That is perfectly acceptable, probably even the standard. where TYPE is the type, NAME is the name in all caps with underscores for spaces, and VALUE is the constant value; I highly recommend NOT putting your constants in their own classes or interfaces. As a side note: Variables that are declared final and are mutable … Read more
Its is a new line
That’s the Unicode Replacement Character, \uFFFD. (info) Something like this should work:
Problem is that your folder is not identified as a Source folder. Right click on the project folder -> Properties Choose ‘Java Build Path’ Click on ‘Sources’ tab on top Click on ‘Add Folder’ on the right panel Select your folders and apply
Since the main method is static and the fxn() method is not, you can’t call the method without first creating a Two object. So either you change the method to: or change the code in main to:
First of all, remember to indent your code for readability. Concept 1. Concept 2. // compare Strings using compareTo method (which returns 0 if equal Rest of your code and concepts are correct 🙂
That’s the hard way, and those java.util.Date setter methods have been deprecated since Java 1.1 (1997). Moreover, the whole java.util.Date class was de-facto deprecated (discommended) since introduction of java.time API in Java 8 (2014). Simply format the date using DateTimeFormatter with a pattern matching the input string (the tutorial is available here). In your specific case of “January 2, 2010” as the input … Read more