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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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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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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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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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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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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 ...
About Java cloneable
I was looking for some tutorials explaining about Java Cloneable , but did not get any good links, and Stack Overflow is becoming more obvious choice anyways.
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How can I get the current stack trace in Java?
How do I get the current stack trace in Java, like how in .NET you can do Environment.StackTrace ?
21 Answers
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How to change the Eclipse default workspace?
... I do if want to change the root directory of eclipse (for file handing in java)?
– Dhruv Singhal
Aug 3 '18 at 13:59
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