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How to asynchronously call a method in Java
...routines lately and thought it would be nice to have something similar in Java. As far as I've searched the common way to parallelize a method call is to do something like:
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Simple way to repeat a String in java
.... ".repeat( 7 ) // Seven period-with-space pairs: . . . . . . .
New in Java 11 is the method String::repeat that does exactly what you asked for:
String str = "abc";
String repeated = str.repeat(3);
repeated.equals("abcabcabc");
Its Javadoc says:
/**
* Returns a string whose value is the co...
Eclipse: Files opened by multiple searches using same editor tab
...n using the "file search" function in eclipse to find a bit of text in a ".java" file, I may get a list of several search results. Let's say I double click on the file "A.java" which then opens A.java in a new editor tab. If I then use the "file search" function again to find some other bit of tex...
How to get a path to a resource in a Java JAR file
...nto individual files in the file system.
Anything you can do by getting a java.io.File could be done by copying the stream out into a temporary file and doing the same, if a java.io.File is absolutely necessary.
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Current time in microseconds in java
...stem, is there a way to get a timestamp with microsecond level accuracy in Java? Something like C's gettimeofday function.
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Different between parseInt() and valueOf() in java?
...ct when it says it returns a 'new' Integer. That's not what it says in the Javadoc. It is free to return a cached Integer.
– Marquis of Lorne
Jul 18 '15 at 11:06
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How do I turn a String into a InputStreamReader in java?
... There’s not the slightest reason to assume that this class is “since Java 1.4”. That wrong version number is especially weird as Java 1.4 introduced NIO and it makes little sense to introduce an API and its conceptional successor within the same version.
– Holger
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Why switch is faster than if
Lots of Java books describe the switch statement as being faster than the if else statement. But I did not find out anywhere why switch is faster than if .
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How to deal with a slow SecureRandom generator?
If you want a cryptographically strong random numbers in Java, you use SecureRandom . Unfortunately, SecureRandom can be very slow. If it uses /dev/random on Linux, it can block waiting for sufficient entropy to build up. How do you avoid the performance penalty?
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How to write logs in text file when using java.util.logging.Logger
...hrough logging.properties file. And it can be passed as JVM parameter ex : java -Djava.util.logging.config.file=/scratch/user/config/logging.properties
Details: https://docs.oracle.com/cd/E23549_01/doc.1111/e14568/handler.htm
Configuring the File handler
To send logs to a file, add FileHandler to...