complete tutorials on core java in java

An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object. In Java, for an object to be written to a stream as an object, it must implement the Serializable interface. The Serializable interface is a marker interface, meaning it doesn’t declare any methods. Its purpose is to indicate to … Read more

The java.lang package is always imported by default. In Java, the java.lang package is always imported by default. This means that you don’t need to explicitly import classes from this package in your Java code; they are automatically available for use. Classes such as String, Object, and System are part of the java.lang package, and you can … Read more

If you are running Java on English Windows platforms, it is probably Cp1252. If you are running Java on English Solaris platforms, it is most likely 8859_1 In Java, the platform’s default character encoding can be obtained using the Charset class. The default character encoding is determined by the system property “file.encoding”. You can retrieve … Read more

The result is a String object. When you add a double value to a String in Java, the double value will be converted to its string representation and then concatenated to the existing String. This process is known as string concatenation. For example: java double doubleValue = 10.5; String stringValue = “The value is: ” + doubleValue; … Read more

The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods needed to directly access data contained in any part of a file. In Java, the File and RandomAccessFile classes serve different purposes and are used in different contexts. File Class: The File class is part of the java.io package and … Read more