Change date format in a Java string

Use LocalDateTime#parse() (or ZonedDateTime#parse() if the string happens to contain a time zone part) to parse a String in a certain pattern into a LocalDateTime. Use LocalDateTime#format() (or ZonedDateTime#format()) to format a LocalDateTime into a String in a certain pattern. Or, when you’re not on Java 8 yet, use SimpleDateFormat#parse() to parse a String in a certain pattern into a Date. Use SimpleDateFormat#format() to format a Date into a String in a certain pattern. See also: Java string to date … Read more

Array.size() vs Array.length

Array.size() is not a valid method Always use the length property There is a library or script adding the size method to the array prototype since this is not a native array method. This is commonly done to add support for a custom getter. An example of using this would be when you want to … Read more

How to read a file line by line or a whole text file at once?

ou can use std::getline : Also note that it’s better you just construct the file stream with the file names in it’s constructor rather than explicitly opening (same goes for closing, just let the destructor do the work). Further documentation about std::string::getline() can be read at CPP Reference. Probably the easiest way to read a whole text file is just … Read more

Is it safe to download code from GitHub?

As with anything you download over the internet, there could be malicious stuff when you download anything, some antivirus quickscan keep novices happy, most do automatically nowadays as people use the files. When you do compile it and run it, well, it is assumed you KNOW what the program is when you compile you will … Read more