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Java8: Why is it forbidden to define a default method for a method from java.lang.Object
Default methods are a nice new tool in our Java toolbox. However, I tried to write an interface that defines a default version of the toString method. Java tells me that this is forbidden, since methods declared in java.lang.Object may not be default ed. Why is this the case?
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Java: Clear the console
Can any body please tell me what code is used for clear screen in Java? For example in C++
14 Answers
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How to initialize HashSet values by construction?
... Although most probably correct at the time of writing, as of Java 7 do use the Diamond operator as in: Set<String> h = new HashSet<>(Arrays.asList("a", "b")); public static final Set<String> MY_SET = new HashSet<>(Arrays.asList(SET_VALUES));
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List of Java class file format major version numbers?
I saw this list of major version numbers for Java in another post:
4 Answers
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How do I get a class instance of generic type T?
...there is no way to find out the runtime type of generic type parameters in Java. I suggest reading the chapter about type erasure in the Java Tutorial for more details.
A popular solution to this is to pass the Class of the type parameter into the constructor of the generic type, e.g.
class Foo<...
When should I use the “strictfp” keyword in java?
...e actually have an example of when you would use the strictfp keyword in Java? Has anyone actually found a use for this?
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.war vs .ear file
...on their functionality
JAR:
EJB modules which contain enterprise java beans (class files) and EJB deployment descriptor are packed as JAR files with .jar extension
WAR:
Web modules which contain Servlet class files, JSP Files, supporting files, GIF and HTML files are packaged as a...
What is mutex and semaphore in Java ? What is the main difference?
What is mutex and semaphore in Java ? What is the main difference ?
11 Answers
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How to schedule a periodic task in Java?
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You should take a look to Quartz it's a java framework wich works with EE and SE editions and allows to define jobs to execute an specific time
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Group a list of objects by an attribute : Java
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In Java 8:
Map<String, List<Student>> studlistGrouped =
studlist.stream().collect(Collectors.groupingBy(w -> w.stud_location));
sha...