How to parse this string in Java?

If you want to split the String at the / character, the String.split method will work: For example: Output Edit Case with a / in the prefix, and we know what the prefix is: The substring without the prefix “slash/prefix/” is made by the substring method. That String is then run through split. Output: Edit again If this String is actually dealing with file paths, using the File class is probably more preferable than … Read more

Please initialize the log4j system properly. While running web service

Those messages are something tricky, enough so that people created this to make it clearer: https://issues.apache.org/bugzilla/show_bug.cgi?id=25747 What’s tricky about them is that the warnings are written if Log4j can’t find its log4j.properties (or log4j.xml) file, but also if the file is fine and dandy but its content is not complete from a configuration point of view. The following paragraph … Read more

Can I catch multiple Java exceptions in the same catch clause?

This has been possible since Java 7. The syntax for a multi-catch block is: Remember, though, that if all the exceptions belong to the same class hierarchy, you can simply catch that base exception type. Also note that you cannot catch both ExceptionA and ExceptionB in the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain: … Read more

Java: Multiple class declarations in one file

My suggested name for this technique (including multiple top-level classes in a single source file) would be “mess”. Seriously, I don’t think it’s a good idea – I’d use a nested type in this situation instead. Then it’s still easy to predict which source file it’s in. I don’t believe there’s an official term for … Read more

Java Ordered Map

The SortedMap interface (with the implementation TreeMap) should be your friend. The interface has the methods: keySet() which returns a set of the keys in ascending order values() which returns a collection of all values in the ascending order of the corresponding keys So this interface fulfills exactly your requirements. However, the keys must have a meaningful order. Otherwise you … Read more

Differences between “java -cp” and “java -jar”?

I prefer the first version to start a java application just because it has less pitfalls (“welcome to classpath hell”). The second one requires an executable jar file and the classpath for that application has to be defined inside the jar’s manifest (all other classpath declaration will be silently ignored…). So with the second version … Read more

MacOS Catalina(v 10.15.3): Error: “chromedriver” cannot be opened because the developer cannot be verified. Unable to launch the chrome browser

I found the work around as below Open terminal Navigate to path where your chromedriver file is located Execute any one of the below commands Command1: xattr -d com.apple.quarantine <name-of-executable> Example (or) Command2: spctl –add –label ‘Approved’ <name-of-executable> Source: https://docwhat.org/upgrading-to-catalina Note: This will work only with the file(s) where the above command is executed. If a new chromedriver … Read more

Java ArrayList copy

Yes, assignment will just copy the value of l1 (which is a reference) to l2. They will both refer to the same object. Creating a shallow copy is pretty easy though: (Just as one example.)

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)