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Tag: java
Java generics super keyword
I went through these topics Generics..? Super T Bounding generics with ‘super’ keyword However, I still seem to be kind of lost with super keyword: When we declare a collection like that: shouldn’t it be the opposite – we have a list that contains some objects (of unknown type) which a…
How can I make Java print quotes, like “Hello”?
How can I make Java print “Hello”? When I type System.out.print(“Hello”); the output will be Hello. What I am looking for is “Hello” with the quotes(“”). Answer The double quote character has to be escaped with a backslash in a Java string literal. Other charact…
How to change root logging level programmatically for logback
I have the following logback.xml file: Now, upon the occurrence of a specific event, I want to programmatically change the level of the root logger from debug to error. I can’t use variable substitution, it is mandatory that I do this within the code. How can it be done ? Thanks. Answer Try this: Note t…
How to get the formatted value of a number for a cell in Apache POI?
I wanted to get the value of a Numeric cell as a simple string. Suppose there the type of cell is numeric with value 90%. Now I cannot use cell.getStringCellValue() as it will throw exception. I also …
How to specify SQL comments through JPA annotations?
Is there any way to specify SQL comments through JPA annotations? Comments for tables and columns. Answer Is there any way to specify SQL comments through JPA annotations? Comments for tables and columns. No. If you want to define tables and columns comments, your best option is to do it after the facts in th…
Convert boolean to int in Java
What is the most accepted way to convert a boolean to an int in Java? Answer ^^ PS : true = 1 and false = 0
How to get localized short day-in-week name (Mo/Tu/We/Th…)
Can I get localized short day-in-week name (Mo/Tu/We/Th/Fr/Sa/Su for English) in Java? Answer The best way is with java.text.DateFormatSymbols
Running shell_exec(‘which java’) in PHP return nothing
If I run from the command line I get the proper input (/usr/java/…/bin/java). However if I run it in a php script: nothing gets printed out for which java but I get the proper results for which ls… Answer Two things were needed: the full path to the JVM (it wasn’t set in the environment) …
How can I normalize the EOL character in Java?
I have a linux server and many clients with many operating systems. The server takes an input file from clients. Linux has end of line char LF, while Mac has end of line char CR, and Windows has end of line char CR+LF The server needs as end of line char LF. Using java, I want to ensure that the