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IntelliJ gives Fatal Error: Unable to find package java.lang in classpath or bootclasspath
...I removed my old JSDK and added it again, but it does not work. I am using Java 2016.3
– mtber75
Dec 1 '16 at 14:09
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Functional style of Java 8's Optional.ifPresent and if-not-Present?
In Java 8, I want to do something to an Optional object if it is present, and do another thing if it is not present.
12 A...
Division of integers in Java [duplicate]
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Is there any keyword in java to divide two numbers e.g. 'Math.floorDiv(num1,num2)'
– Rudra
Jan 4 '16 at 12:51
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initializing a boolean array in java
... would cause ArrayIndexOutOfBoundsException. To learn more about arrays in Java, consult this basic Oracle tutorial.
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Split string to equal length substrings in Java
... split the string "Thequickbrownfoxjumps" to substrings of equal size in Java.
Eg. "Thequickbrownfoxjumps" of 4 equal size should give the output.
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Best way to concatenate List of String objects? [duplicate]
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Your approach is dependent on Java's ArrayList#toString() implementation.
While the implementation is documented in the Java API and very unlikely to change, there's a chance it could. It's far more reliable to implement this yourself (loops, StringBuild...
How to deal with a slow SecureRandom generator?
If you want a cryptographically strong random numbers in Java, you use SecureRandom . Unfortunately, SecureRandom can be very slow. If it uses /dev/random on Linux, it can block waiting for sufficient entropy to build up. How do you avoid the performance penalty?
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Obtaining a powerset of a set in Java
... This method is now in Guava: guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/…
– Kevin Bourrillion
Jul 9 '10 at 1:59
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Data access object (DAO) in Java
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Check also the sequence diagram here:
http://www.oracle.com/technetwork/java/dataaccessobject-138824.html
Maybe a simple example can help you understand the concept:
Let's say we have an entity to represent an employee:
public class Employee {
private int id;
private String name;
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Volatile vs Static in Java
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Declaring a static variable in Java, means that there will be only one copy, no matter how many objects of the class are created. The variable will be accessible even with no Objects created at all. However, threads may have locally cached values of it.
W...