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How to convert jsonString to JSONObject in Java
...fore choosing. See this benchmark I did using JMH: github.com/fabienrenaud/java-json-benchmark It clearly shows jackson faster than anything else and 5 to 6 times faster than org.json.
– fabien
Jun 27 '16 at 20:47
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How to append text to an existing file in Java?
I need to append text repeatedly to an existing file in Java. How do I do that?
31 Answers
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Hash String via SHA-256 in Java
... other freely available utility) to generate a SHA-256 Hash of a String in Java. Looking at their documentation I can't seem to find any good examples of what I want to do. Can anybody here help me out?
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Developing for Android in Eclipse: R.java not regenerating
I've found out that my R.java is never updated, so it doesn't contain information about my new resources, so I decided to delete it and thought that Eclipse would generate a new one. But that didn't happen, and I don't have R.java now. How can I regenerate one?
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Can overridden methods differ in return type?
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Java supports* covariant return types for overridden methods. This means an overridden method may have a more specific return type. That is, as long as the new return type is assignable to the return type of the method you ar...
Get integer value of the current year in Java
I need to determine the current year in Java as an integer. I could just use java.util.Date() , but it is deprecated.
15 A...
Change date format in a Java string
..."));
System.out.println(newstring); // 2011-01-18
Or, when you're not on Java 8 yet, use SimpleDateFormat#parse() to parse a String in a certain pattern into a Date.
String oldstring = "2011-01-18 00:00:00.0";
Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S").parse(oldstring);
Use Simpl...
Build Eclipse Java Project from Command Line
Is there a way to compile an Eclipse-based Java project from the command line?
8 Answers
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Java current machine name and logged in user?
...("user.name"); //platform independent
and the hostname of the machine:
java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost();
System.out.println("Hostname of local machine: " + localMachine.getHostName());
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Is there a Mutex in Java?
Is there a Mutex object in java or a way to create one?
I am asking because a Semaphore object initialized with 1 permit does not help me.
Think of this case:
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