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Java Generate Random Number Between Two Given Values [duplicate]
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With respect to the Java naming convention the variable names should start with lower case character
– Jens
May 19 '17 at 8:13
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How can I give the Intellij compiler more heap space?
...ss heap size.
Older versions:
Settings (Preferences on Mac) | Compiler | Java Compiler | Maximum heap size.
Compiler runs in a separate JVM by default so IDEA heap settings that you set in idea.vmoptions have no effect on the compiler.
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How do HashTables deal with collisions?
...tions which if you are lucky might send the objects to different buckets.
Java uses both option 1 and 2 in its hash table implementations.
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Java: Check if enum contains a given string?
... should never be used for ordinary control flow" (Joshua Bloch, "Effective Java").
– james.garriss
May 20 '14 at 16:34
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What is a difference between
... I never really got the PECS explanation by Josh Block in effective Java. However @Yishai, this is a helpful way to remember. Perhaps we can propose a new mnemonic, SAGE: Super -> Add / Get -> Extend
– dcompiled
Sep 28 '14 at 21:15
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Stateless and Stateful Enterprise Java Beans
I am going through the Java EE 6 tutorial and I am trying to understand the difference between stateless and stateful session beans. If stateless session beans do not retain their state in between method calls, why is my program acting the way it is?
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How can I truncate a double to only two decimal places in Java?
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If you want that for display purposes, use java.text.DecimalFormat:
new DecimalFormat("#.##").format(dblVar);
If you need it for calculations, use java.lang.Math:
Math.floor(value * 100) / 100;
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Using Java 8 to convert a list of objects into a string obtained from the toString() method
There are a lot of useful new things in Java 8. E.g., I can iterate with a stream over a list of objects and then sum the values from a specific field of the Object 's instances. E.g.
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Why are arrays covariant but generics are invariant?
From Effective Java by Joshua Bloch,
9 Answers
9
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What is the 'instanceof' operator used for in Java?
...an object.
It returns a boolean value.
For example
package test;
import java.util.Date;
import java.util.Map;
import java.util.HashMap;
public class instanceoftest
{
public static void main(String args[])
{
Map m=new HashMap();
System.out.println("Returns a boolean value ...