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Check whether a string is not null and not empty
...isEmpty())
Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available since Java SE 1....
Any way to Invoke a private method?
... In my own example (stackoverflow.com/a/15612040/257233) I get a java.lang.StackOverflowError if I do not call setAccessible(true).
– Robert Mark Bram
Mar 25 '13 at 10:11
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Programmatically shut down Spring Boot application
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@Denys No, the context does not exit the java process on close. The exit in my example just demonstrates how the ExitCodeGenerator can be used. You could just return from the main method to exit gracefully (exit code 0).
– Sotirios Delimanolis
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Is there a version control system for database structure changes?
...is the choice for Ruby projects. The nearest equivalent to this design in java is mybatis schema migrations. For .NET the equivalent is code.google.com/p/migratordotnet. They're all excellent tools for this job IMO.
– Dan Tanner
May 9 '12 at 12:50
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How do I verify that an Android apk is signed with a release certificate?
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Use this command, (go to java < jdk < bin path in cmd prompt)
$ jarsigner -verify -verbose -certs my_application.apk
If you see "CN=Android Debug", this means the .apk was signed with the debug key generated by the Android SDK
(means it is u...
Eclipse IDE for Java - Full Dark Theme
Is there any way to completely turn Eclipse to a dark IDE?
Here's a Picture of what I'm asking:
19 Answers
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How do I diff the same file between two different commits on the same branch?
...g that if you are in your project root folder
$git difftool HEAD:src/main/java/com.xyz.test/MyApp.java HEAD^:src/main/java/com.xyz.test/MyApp.java
You should have the following entries in your ~/.gitconfig or in project/.git/config file. Install the p4merge [This is my preferred diff and merge to...
How do you close/hide the Android soft keyboard using Java?
I have an EditText and a Button in my layout.
108 Answers
108
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Make copy of an array
...opy loop may be faster because of the setup overheads. If you look at the javadoc for System.arraycopy, you'll see that the method needs to check various things before it starts. Some of these checks are unnecessary with a copy loop, depending on the static array types.
– Ste...
What is the best way to do GUIs in Clojure?
...will humbly suggest Seesaw.
Here's a REPL-based tutorial that assumes no Java or Swing knowledge.
Seesaw's a lot like what @tomjen suggests. Here's "Hello, World":
(use 'seesaw.core)
(-> (frame :title "Hello"
:content "Hello, Seesaw"
:on-close :exit)
pack!
show!)
and he...