java - Read For Learn

What does the colon (:) operator do?

There are several places colon is used in Java code: 1) Jump-out label (Tutorial): 2) Ternary condition (Tutorial): 3) For-each loop (Tutorial): 4) Assertion (Guide): 5) Case in switch statement (Tutorial): 6) Method references (Tutorial)

How to get the current working directory in Java?

Code : This will print the absolute path of the current directory from where your application was initialized. Explanation: From the documentation: java.io package resolve relative pathnames using current user directory. The current directory is represented as system property, that is, user.dir and is the directory from where the JVM was invoked.

Java, “Variable name” cannot be resolved to a variable

If you look at the scope of the variable ‘hoursWorked’ you will see that it is a member of the class (declared as private int) The two variables you are having trouble with are passed as parameters to the constructor. The error message is because ‘hours’ is out of scope in the setter.

javax.naming.NameNotFoundException

I am getting the error (…) javax.naming.NameNotFoundException: greetJndi not bound This means that nothing is bound to the jndi name greetJndi, very likely because of a deployment problem given the incredibly low quality of this tutorial (check the server logs). I’ll come back on this. Is there any specific directory structure to deploy in JBoss? The internal structure … Read more

How to get locator of current web element?

So basically you need By element from webElement. You can try this:

how to fix EXE4J_JAVA_HOME, No JVM could be found on your system error?

This has to be done during your exe4j configuration. In the fourth step of Exe4j wizard which is Executable Info select> Advanced options select 32-bit or 64-bit. This worked well for me. or else install both JDK tool-kits x64 and x32 in your machine.

Error: Selection does not contain a main type

I hope you are trying to run the main class in this way, see screenshot: If not, then try this way. If yes, then please make sure that your class you are trying to run has a main method, that is, the same method definition as below: I hope this will help you.

How can I check whether an array is null / empty?

There’s a key difference between a null array and an empty array. This is a test for null. “Empty” here has no official meaning. I’m choosing to define empty as having 0 elements: An alternative definition of “empty” is if all the elements are null: or

Java Generate Random Number Between Two Given Values

You could use e.g. r.nextInt(101) For a more generic “in between two numbers” use: This gives you a random number in between 10 (inclusive) and 100 (exclusive)

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