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Java 8 functional interface with no arguments and no return value
What is the Java 8 functional interface for a method that takes nothing and returns nothing?
3 Answers
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IllegalMonitorStateException on wait() call
I am using multi-threading in java for my program.
I have run thread successfully but when I am using Thread.wait() , it is throwing java.lang.IllegalMonitorStateException .
How can I make a thread wait until it will be notified?
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Why don't Java Generics support primitive types?
Why do generics in Java work with classes but not with primitive types?
6 Answers
6
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Import PEM into Java Key Store
... If I have multiple certificates on the .pem, how do I import to a Java keystore?
– Erick
Jan 21 '17 at 0:16
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What does a lazy val do?
...ely calls itself, and causes a StackOverflowError
scala> t
java.lang.StackOverflowError
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// when the t is initialized to itself un-lazily, the compiler warns you of the recursive call
scala> val t: Int = t
<console>:12: warning: value t does nothing other than call itsel...
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
... address.It is possible to retrieve an
object’s memory address using the java.lang.Unsafe class, and operate on its fields directly via unsafe get/put methods!
Compile time optimizations for JVM. HIgh performance VM using "magic", requiring low-level operations. eg: http://en.wikipedia.org/wiki/Ji...
What is object serialization?
...rm and libraries.I really want to know the format.
– JAVA
Aug 31 '14 at 19:52
1
Is it applicable ...
throws Exception in finally blocks
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If you're using Java 7, and resource implements AutoClosable, you can do this (using InputStream as an example):
try (InputStream resource = getInputStream()) {
// Use the resource.
}
catch( Exception ex ) {
// Problem with the resource...
How can I iterate through the unicode codepoints of a Java String?
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Yes, Java uses a UTF-16-esque encoding for internal representations of Strings, and, yes, it encodes characters outside the Basic Multilingual Plane (BMP) using the surrogacy scheme.
If you know you'll be dealing with characters ...
Spring Boot: How can I set the logging level with application.properties?
...imple question, but I cannot find information.
(Maybe my knowledge about Java frameworks is severely lacking)
15 Answers
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