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Jackson serialization: ignore empty values (or null)
...-gson/], where these null fields will be automatically removed.
SampleDTO.java
public class SampleDTO {
String username;
String email;
String password;
String birthday;
String coinsPackage;
String coins;
String transactionId;
boolean isLoggedIn;
// getters/set...
Remove Item from ArrayList
...o use ListIterator remove() method for removing objects from Collection in Java, because there may be chance that another thread is modifying the same collection and could leads to ConcurrentModificationException.
– Min2
Jun 21 '18 at 3:05
...
Simple regular expression for a decimal with a precision of 2
...
For Java users: the decimal shouldn't be escaped.
– user1382306
Jan 26 '14 at 22:10
3
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Why is printing “B” dramatically slower than printing “#”?
...
I performed tests on Eclipse vs Netbeans 8.0.2, both with Java version 1.8;
I used System.nanoTime() for measurements.
Eclipse:
I got the same time on both cases - around 1.564 seconds.
Netbeans:
Using "#": 1.536 seconds
Using "B": 44.164 seconds
So, it looks like Netbeans has bad...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
... - the ToUpper method
doesn't turn ß into SS.
For example this works in Java (and even in Javascript), given string that is in Normal Form C:
//Poor man's case folding.
//There are some edge cases where this doesn't work
public static String toCaseFold( String input, Locale cultureInfo ) {
r...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
... arrives. Instead of implementing the event listeners with the traditional Java programming in Android, programmers can simply accomplish this by dragging a block and adding corresponding actions they want when a specific event occurs.
Unlike the traditional text-based programming, MIT App Inventor...
Eclipse secure storage
...
In windows 7 enerprise 64 bits + java 8
In eclipse go to :
Preferences
--> General
-> security
-> secure Storage.
In master Password providers UNCKECK Windows integration (64 bits)
Then go to General -- network connectio...
Why does (0 < 5 < 3) return true?
...
Order of operations causes (0 < 5 < 3) to be interpreted in javascript as ((0 < 5) < 3) which produces (true < 3) and true is counted as 1, causing it to return true.
This is also why (0 < 5 < 1) returns false, (0 < 5) returns true, which is interpreted as 1, result...
asynchronous vs non-blocking
...
Putting this question in the context of NIO and NIO.2 in java 7, async IO is one step more advanced than non-blocking.
With java NIO non-blocking calls, one would set all channels (SocketChannel, ServerSocketChannel, FileChannel, etc) as such by calling AbstractSelectableChannel.co...
How to sign an android apk file
...t to sign your unsigned apk.
Use the keytool provided by the JDK found in %JAVA_HOME%/bin/
keytool -genkey -v -keystore my.keystore -keyalg RSA -keysize 2048 -validity 10000 -alias app
Step 2 or 4: Zipalign
zipalign which is a tool provided by the Android SDK found in e.g. %ANDROID_HOME%/sdk/bui...