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Apache POI Excel - how to configure columns to be expanded?
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Warning about autoSizeColumn, this requires java Font be available. This is not part of the headless java jre used on servers and will throw a NullPointerException.
– Stephen Dillon
Oct 2 '17 at 20:28
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Print an integer in binary format in Java
... do it by writing an algorithm, Is there any built-in function for that in Java?
21 Answers
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What is the reason for a red exclamation mark next to my project in Eclipse?
... Package Explorer and Project Explorer views now show a
new decorator on Java projects and working sets that contain build
path errors:
The concrete errors can be seen in the Problems view, and if you open
the view menu and select Group By > Java Problem Type, they all show
up ...
What is the difference between mocking and spying when using Mockito?
...ks and it was confusing for some users. Read more about spying: here or in javadoc for spy(Object) method.
callRealMethod() was introduced after spy(), but spy() was left there of course, to ensure backward compatibility.
Otherwise, you're right: all the methods of a spy are real unless stubbed. Al...
Android encryption / decryption using AES [closed]
...vation is used as it is more secured.
import android.util.Base64;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParam...
Eclipse Optimize Imports to Include Static Imports
...so has the Favorite preference section:
Window > Preferences > Java > Editor > Content Assist > Favorites
In mine, I have the following entries (when adding, use "New Type" and omit the .*):
org.hamcrest.Matchers.*
org.hamcrest.CoreMatchers.*
org.junit.*
org.junit.Assert.*
o...
How to parse date string to Date? [duplicate]
...o reconsider if you wouldn't rather like to use HH instead of kk. Read the javadoc for details about valid patterns.
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Java ByteBuffer to String
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There's no k.getBytes() method in java.nio.ByteBuffer (may be not in the version am using). So I used k.array() method which will return byte[].
– Madura Pradeep
Apr 20 '16 at 9:29
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What is the fastest way to compare two sets in Java?
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You have the following solution from https://www.mkyong.com/java/java-how-to-compare-two-sets/
public static boolean equals(Set<?> set1, Set<?> set2){
if(set1 == null || set2 ==null){
return false;
}
if(set1.size() != set2.size()){
return fal...
What's wrong with overridable method calls in constructors?
... the object may be inconsistent and/or incomplete.
A quote from Effective Java 2nd Edition, Item 17: Design and document for inheritance, or else prohibit it:
There are a few more restrictions that a class must obey to allow inheritance. Constructors must not invoke overridable methods, directl...