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Java int to String - Integer.toString(i) vs new Integer(i).toString()
Sometimes java puzzles me.
I have a huge amount of int initializations to make.
11 Answers
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String isNullOrEmpty in Java? [duplicate]
...d before, but Googling doesn't find it . Is there, in any of the standard java libraries (including apache/google/...), a static isNullOrEmpty() method for Strings ?
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Java: Get first item from a collection
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In java 8:
Optional<String> firstElement = collection.stream().findFirst();
For older versions of java, there is a getFirst method in Guava Iterables:
Iterables.getFirst(iterable, defaultValue)
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IntelliJ not recognizing a particular file correctly, instead its stuck as a text file
... note for googlers happening upon this, I had the exact same issue (with a Java file) with the same resolution; IntelliJ 13. When trying to create the file, I encountered the error 'Unable to parse template "Interface" Selected class file name mapped to not java'. Couldn't find that error message an...
How to sort an ArrayList?
I have a List of doubles in java and I want to sort ArrayList in descending order.
20 Answers
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How do I create a right click context menu in Java Swing?
...section on Bringing Up a Popup Menu in the How to Use Menus article of The Java Tutorials which explains how to use the JPopupMenu class.
The example code in the tutorial shows how to add MouseListeners to the components which should display a pop-up menu, and displays the menu accordingly.
(The ...
Static nested class in Java, why?
I was looking at the Java code for LinkedList and noticed that it made use of a static nested class, Entry .
14 Answers
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How to create a new java.io.File in memory?
How can I create new File (from java.io ) in memory, not on the hard disk?
3 Answers
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Java; String replace (using regular expressions)?
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String input = "hello I'm a java dev" +
"no job experience needed" +
"senior software engineer" +
"java job available for senior software engineer";
String fixedInput = input.replaceAll("(java|job|senior)", "<b>$1</b>");
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How to convert String to long in Java?
I got a simple question in Java: How can I convert a String that was obtained by Long.toString() to long ?
9 Answers
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