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What is the Java ?: operator called and what does it do? In particular, if Java ever gets another ternary operator, people who use the term "conditional operator" will still be correct and unambiguous - unlike those who just say "ternary operator" Yes, the phrase "ternary operator" has stuck - my answer is part of an effort to "unstick" it, just as I try to correct the claim that "objects are passed
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
java - (AND) and || (OR) in IF statements - Stack Overflow All the answers here are great but, just to illustrate where this comes from, for questions like this it's good to go to the source: the Java Language Specification Section 15:23, Conditional-And operator ( ) , says:
in java what does the @ symbol mean? - Stack Overflow In Java Persistence API you use them to map a Java class with database tables For example @Table() Used to map the particular Java class to the date base table @Entity Represents that the class is an entity class Similarly you can use many annotations to map individual columns, generate ids, generate version, relationships etc
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
java - Setting active profile and config location from command line in . . . Option 1: Java System Properties (VM Arguments) It's important that the -D parameters are before your application jar otherwise they are not recognized java -jar -Dspring profiles active=prod application jar Option 2: Program arguments java -jar application jar --spring profiles active=prod --spring config location=c:\config
java - Extracting . jar file with command line - Stack Overflow Java has a class specifically for zip files and one even more specifically for Jar Files java util jar JarOutputStream java util jar JarInputStream using those you could, on a command from the console, using a scanner set to system in Scanner console = new Scanner(System in); String input = console nextLine();