Programming Articles - Page 3332 of 3366

Java uses javac (compiler) to convert the java code to byte code (.class file).Then, JVM internally converts the bytecode to system understandable code using an interpreter in addition to it JVM.Instead of executing a piece of code, again and again, JVM identifies them as “hot spots” and compiles them using Just in time compiler and, later reuses the same when required.

Java provides three editions JSE, JEE, JME. JSE − Java Standard Edition using this, you can develop stand-alone applications. This provides the following packages − java.lang − This package provides the language basics. java.util − This package provides classes and interfaces (API’s) related to collection framework, events, data structure and other utility classes such as date. java.io − This package provides classes and interfaces for file operations, and other input and output operations. java.math − This package provides classes and interfaces for multiprecision arithmetics. java.nio − This package provides classes and interfaces the Non-blocking I/O framework for Java java.net ... Read More

You can use the os.chroot to change the root directory of the current process to path. This command is only available on Unix systems. You can use it as follows:>>> import os >>> os.chroot('/tmp/my_folder')This changes the root directory of the script running to /tmp/my_folder.

You can change the owner of a file or a directory using the pwd, grp and os modules. The uid module is used to get the uid from user name, grp to get gid group name string and os to change the owner:Exampleimport pwd import grp import os uid = pwd.getpwnam("my_name").pw_uid gid = grp.getgrnam("my_group").gr_gid path = 'my_folder' os.chown(path, uid, gid)

You can find the version of the Java software currently installed in your system using Programs and using Command prompt. Using Command prompt The -version command of the java command prompt gives you the current version of the Java software installed in your system. Therefore, open command prompt and type the command java -version to get the version of Java installed in your system. Using the Java program The System class of java.lang package provides a method named getProperty() this method accepts one of the following string parameters an returns the respective property. To get the version of the ... Read More

Changing the ownership of a file is to transfer the file's ownership from one user to another. This is mainly to specify who has control over modifying, deleting, or setting permissions for the file. Before you change the ownership of a file, make sure you have administrative privileges, and the methods discussed below only work on Linux.To change the ownership of a file from one user to another in Python, we can use the following ways - Using os.chown() Method The os.chown() method is used to change the owner and group ID of a file. To this method, we need to ... Read More

The System class of java.lang package provides a method named getProperty() this method accepts one of the following string parameters an returns the respective property. java.class.path − If you pass this value as a parameter, the getProperty() method returns the current classpath. java.home − If you pass this value as a parameter, the getProperty() method returns the current Installation directory of the JRE. java.vendor − If you pass this value as a parameter, the getProperty() method returns the current vendor name of the JRE. java.vendor.url − If you pass this value as a parameter, the getProperty() method returns the ... Read More

IntelliJ and NetBeans are the alternative IDE’s for Java development.

Many of us have a misconception that Java script is an object oriented language. But, the truth is Java Script is an Object Based Language. Object Based languages are different from Object Oriented Languages: Object Based Languages Object based languages supports the usage of object and encapsulation. They does not support inheritance or, polymorphism or, both. Object based languages does not supports built-in objects. Javascript, VB are the examples of object bases languages. Object Oriented Languages Object Oriented Languages supports all the features of Oops including inheritance and polymorphism. They support built-in objects. C#, Java, VB. Net ... Read More

In fact, you can directly start learning Java without any prior knowledge of programming language. But, the syntax in Java is similar to the syntax of the C programming language, therefore, Knowing C language helps to get hold of Java quickly. Having introduced to object-oriented principles before starting Java, also helps in the understanding of the language so, having an idea on object-oriented languages such as C++ also helps. In short, if you know C or C++ it will be a little bit easier to cope with Java technology.