In a Bash script, how can I exit the entire script if a certain condition occurs?
Try this statement: Replace 1 with appropriate error codes. See also Exit Codes With Special Meanings.
Java
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
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.)
java.io.FileNotFoundException: the system cannot find the file specified
Put the word.txt directly as a child of the project root folder and a peer of src Disclaimer: I’d like to explain why this works for this particular case and why it may not work for others. Why it works: When you use File or any of the other FileXxx variants, you are looking for a file on the file … Read more
Why is there no SortedList in Java?
List iterators guarantee first and foremost that you get the list’s elements in the internal order of the list (aka. insertion order). More specifically it is in the order you’ve inserted the elements or on how you’ve manipulated the list. Sorting can be seen as a manipulation of the data structure, and there are several ways … Read more
exception in thread ‘main’ java.lang.NoClassDefFoundError:
The following program is throwing error: Can you please tell me the root cause?
How to use multiple classes in java in one file?
You can only have one public top-level class per file. So, remove the public from all but one (or all) of the classes. However, there are some surprising problems that can happen if you have multiple classes in a file. Basically, you can get into trouble by (accidentally or otherwise) defining multiple classes with the same name in the same … Read more
Does Java support default parameter values?
No, the structure you found is how Java handles it (that is, with overloading instead of default parameters). For constructors, See Effective Java: Programming Language Guide’s Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. For other methods, renaming some cases or using a parameter object can help. This is … Read more