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 …

Mar 7, 2010 · 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...

Feb 7, 2013 · From Oracle's documentation: Note that the JVM uses more memory than just the heap. For example Java methods, thread stacks and native handles are allocated in memory separate from the heap, as well as JVM internal data structures.

Aug 16, 2021 · How does my Java program know where my keystore containing the certificate is? Or alternatively: How do I tell my Java program where to look for the keystore? After specifying the keystore in some ...

Sep 26, 2008 · I know there's some JAVA_OPTS to set to remotely debug a Java program. What are they and what do they mean ?

Sep 23, 2008 · Many times, a Java app needs to connect to the Internet. The most common example happens when it is reading an XML file and needs to download its schema. I am behind a proxy server. How can I set ...

JavaBeans are Java classes which adhere to an extremely simple coding convention. All you have to do is to implement the java.io.Serializable interface - to save the state of an object use a public empty argument constructor - to instantiate the object provide public getter/setter methods - to get and set the values of private variables ...

Aug 5, 2015 · 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.

Dec 4, 2016 · 11 If you don`t want to create a manifest just to run the jar file, you can reference the main-class directly from the command line when you run the jar file. java -jar Predit.jar -classpath your.package.name.Test This sets the which main-class to run in the jar file.

Jun 10, 2009 · Steps: Start your remote java application with debugging options as said in above post. Configure Eclipse for remote debugging by specifying host and port. Start remote debugging in Eclipse and wait for connection to succeed. Setup breakpoint and debug. If you want to debug from start of application use suspend=y , this will keep remote application suspended until you …