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What does the Java assert keyword do, and when should it be used?
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Assertions (by way of the assert keyword) were added in Java 1.4. They are used to verify the correctness of an invariant in the code. They should never be triggered in production code, and are indicative of a bug or misuse of a code path. They can be activated at run-time by w...
Java: How to set Precision for double value? [duplicate]
...or double values DecimalFormat is good technique. To use this class import java.text.DecimalFormat and create object of it for example
double no=12.786;
DecimalFormat dec = new DecimalFormat("#0.00");
System.out.println(dec.format(no));
So it will print two digits after decimal point here it wil...
How to generate a random alpha-numeric string?
I've been looking for a simple Java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated).
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Why is a combiner needed for reduce method that converts type in java 8
... compilation error you got - argument mismatch; int cannot be converted to java.lang.String. Actually, I think passing 0 as the identity value is also wrong here, since a String is expected (T).
Also note that this version of reduce processes a stream of Ts and returns a T, so you can't use it to r...
Is it better to reuse a StringBuilder in a loop?
...antiation was the bottleneck, comment it.
Three runs with this answer:
$ java ScratchPad
1567
$ java ScratchPad
1569
$ java ScratchPad
1570
Three runs with the other answer:
$ java ScratchPad2
1663
2231
$ java ScratchPad2
1656
2233
$ java ScratchPad2
1658
2242
Although not significant, settin...
Getting the name of the currently executing method
Is there a way to get the name of the currently executing method in Java?
22 Answers
2...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
...d pre-processor features of the compiler. It is possible to use C++, C# or Java compiler. Any ideas???
13 Answers
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Is D a credible alternative to Java and C++? [closed]
Is the D language a credible alternative to Java and C++? What will it take to become a credible alternative? Should I bother learning it? Does it deserve evangelizing?
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equals vs Arrays.equals in Java
When comparing arrays in Java, are there any differences between the following 2 statements?
8 Answers
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Eclipse: The declared package does not match the expected package
... me, I'll share how I solved this problem.
It turns out that I opened the java file under the 'src' before declaring it a source directory.
After right clicking on the 'src' directory in eclipse, selecting 'build path', and then 'Use as Source Folder'
Close and reopen the already opened java file...