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What is the Java ?: operator called and what does it do? Not only in Java, this syntax is available within PHP, Objective-C too In the following link it gives the following explanation, which is quiet good to understand it: A ternary operator is some operation operating on 3 inputs It's a shortcut for an if-else statement, and is also known as a conditional operator In Perl PHP it works as:
java - (AND) and || (OR) in IF statements - Stack Overflow Java has 5 different boolean compare operators: , , |, ||, ^ and are "and" operators, | and || "or" operators, ^ is "xor" The single ones will check every parameter, regardless of the values, before checking the values of the parameters The double ones will first check the left parameter and its value and if true (||) or false ( ) leave the second one untouched Sound compilcated? An
What are the -Xms and -Xmx parameters when starting JVM? The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory For example, starting a JVM like below will start it with 256 MB of memory and will allow the process to use up to 2048 MB
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(); then get all the components and write them as a file JarEntry JE = null; while((JE
What does the ^ operator do in Java? - Stack Overflow It is the Bitwise xor operator in java which results 1 for different value of bit (ie 1 ^ 0 = 1) and 0 for same value of bit (ie 0 ^ 0 = 0) when a number is written in binary form
java - What is a classpath and how do I set it? - Stack Overflow I was just reading this line: The first thing the format() method does is load a Velocity template from the classpath named output vm Please explain what was meant by classpath in this context, a
logging - How to use log levels in java - Stack Overflow The java util logging Level documentation does a good job of defining when to use a log level and the target audience of that log level Most of the confusion with java util logging is in the tracing methods
boolean operations - How to use or in Java? - Stack Overflow The || operator can only be used, in Java, where a boolean (true or false) expression is expected, such as in an if statement like the above So pretty much in an if or a conditional operator (that ? : thing, sometimes called the ternary operator)