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What does the ^ operator do in Java? - Stack Overflow
Exponentiation in Java. As for integer exponentiation, unfortunately Java does not have such an operator. You can use double Math.pow(double, double) (casting the result to int if necessary). You can also use the traditional bit-shifting trick to compute some powers of two. That is, (1L << k) is two to the k-th power for k=0..63. See also

How do the post increment (i++) and pre increment (++i) operators work ...
Can you explain to me the output of this Java code? int a=5,i; i=++a + ++a + a++; i=a++ + ++a + ++a; a=++a + ++a + a++; System.out.println(a); System.out.println(i ...

What does the arrow operator, '->', do in Java? - Stack Overflow
Details: Java 6, Apache Commons Collection, IntelliJ 12. Update/Answer: It turns out that IntelliJ 12 supports Java 8, which supports lambdas, and is "folding" Predicates and displaying them as lambdas. Below is the "un-folded" code.

java - && (AND) and || (OR) in IF statements - Stack Overflow
Will Java still check the second statement? Because in order the first statement to be true, the HashMap should not contain the given key, so if the second statement is checked, I will get NullPointerException .

java - Using NOT operator in IF conditions - Stack Overflow
Java 11 added isEmpty, but before that there was only isPresent. Image you are trying to return early from a function ( a common programming best practice) Image you are trying to return early from a function ( a common programming best practice)

What is the percent % operator in java? - Stack Overflow
n%10 means the modulus of 10, that is the remainder you get when you divide with 10. Here it is used to get each digit.

java - What is a Question Mark "?" and Colon - Stack Overflow
The Java jargon uses the expression method, not functions - in other contexts there is the distinction of function and procedure, dependent on the existence of a return type, which is required in a ternary expression.

What are the -Xms and -Xmx parameters when starting JVM?
-Xss set java thread stack size -Xprof output cpu profiling data -Xfuture enable strictest checks, anticipating future default -Xrs reduce use of OS signals by Java/VM (see documentation) -Xcheck:jni perform additional checks for JNI functions -Xshare:off do not attempt to use shared class data -Xshare:auto use shared class data if ...

Proper usage of Java -D command-line parameters
You're giving parameters to your program instead to Java. Use. java -Dtest="true" -jar myApplication.jar instead. Consider using "true".equalsIgnoreCase(System.getProperty("test")) to avoid the NPE. But do not use "Yoda conditions" always without thinking, sometimes throwing the NPE is the right behavior and sometimes something like

How to import a .cer certificate into a java keystore?
Importing .cer certificate file downloaded from browser (open the url and dig for details) into cacerts keystore in java_home\jre\lib\security worked for me, as opposed to attemps to generate and use my own keystore. Go to your java_home\jre\lib\security (Windows) Open admin command line there using cmd and CTRL+SHIFT+ENTER

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