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Using Application context everywhere?
...ntln("x:"+Y.xinstance+" y:"+X.yinstance);
}
}
Let's run the code:
$ javac A.java
$ java A
x:X@a63599 y:Y@9036e
x:null y:null
The second line shows that Y.xinstance and X.yinstance are null; they are null because the variables X.xinstance ans Y.yinstance were read when they were null.
Can ...
Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
... please refer to our site mboot.herokuapp.com, we publish article related java - spring-boot
– Salah Atwa
Jun 21 at 22:08
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How do I make the method return type generic?
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I don't disagree about that, but we are dealing with Java and all of its design decisions/foibles. I see this question as just trying to learn what is possible in Java generics, not as an xyproblem (meta.stackexchange.com/questions/66377/what-is-the-xy-problem) that needs to be...
Assign variable in if condition statement, good practice or not? [closed]
I moved one years ago from classic OO languages such like Java to JavaScript. The following code is definitely not recommended (or even not correct) in Java:
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Difference between class and type
Being new to Java, I'm confused between the concepts of class and type .
For example, should the object "Hello World!" belong to the type String or class String ? Or maybe both?
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How do I print a list of “Build Settings” in Xcode project?
...termediateBuildFilesPath/project.build/Distribution-iphoneos/Project.build/JavaClasses"
CLEAN_PRECOMPS YES
CLONE_HEADERS NO
CODESIGNING_FOLDER_PATH "/Users/username/Library/Developer/Xcode/DerivedData/project-dxdgjvgsvvbhowg...
Java: how to convert HashMap to array
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@Alex "In older Java versions using pre-sized array was recommended (...) However since late updates of OpenJDK 6 this call was intrinsified, making the performance of the empty array version the same and sometimes even better, compared to t...
Should a “static final Logger” be declared in UPPER-CASE?
In Java, static final variables are constants and the convention is that they should be in upper-case. However, I have seen that most people declare loggers in lower-case which comes up as a violation in PMD .
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Differences in boolean operators: & vs && and | vs ||
...); // 6
Thanks to Carlos for pointing out the appropriate section in the Java Language Spec (15.22.1, 15.22.2) regarding the different behaviors of the operator based on its inputs.
Indeed when both inputs are boolean, the operators are considered the Boolean Logical Operators and behave similar...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
... a bit weak in that area. I expect that you will be able to translate this Java code without too much trouble though.
Graph.java:
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
public class Graph {
private M...