Object Class in Java

Object Class in Java

The Object class is located in java.lang package. The Object class is the parent of all other classes in Java, either directly or indirectly. Classes that do not extend any other classes are considered the direct children of Object, while classes that do extend other classes are considered indirect descendants. Therefore, any Java class can make use of the Object class’s methods. In Java programs, the Object class serves as the root of the inheritance tree.

The Application of Object Class Methods in Java

Multiple methods are provided by the Object class, which include the following:

  • tostring() method
  • hashCode() method
  • equals(Object obj) method
  • finalize() method
  • getClass() method
  • clone() method
  • wait(), notify() notifyAll() methods
toString() method.

The toString() function offers a String representation of an object and converts an object to a String. Class Object’s default toString() method generates a string that includes the class name, an at-sign (‘@’), and the object’s unsigned hexadecimal hash code. It is usually advisable to override the toString() method in order to obtain our own String representation of Object. To know more enroll in our Java training in Chennai offered by industry experts.

hashCode() technique

The JVM creates a hashcode, or distinct number, for each object. For different items, it returns different integers. It’s a frequent misperception that this method’s hashCode() function returns the object’s address, but this is false. It applies an algorithm to transform the object’s internal address to an integer. The hashCode() method is native since it needs native languages like C/C++ to obtain an object’s address given that it is difficult to find an object’s address in Java.

Using the hashCode() method

It gives back a hash value that can be used to look up objects in a collection. When saving objects into hashing-related data structures like HashSet, HashMap, Hashtable, etc., the JVM (Java Virtual Machine) employs the hashcode approach. Searching is made simple as a result of preserving things using hash codes. Java training in Chennai gives you insight into every function of Java. Enroll now to explore more.

equals(Object obj) method

It contrasts the provided item with “this” object (the object on which the method is called). It offers a general method to check whether two items are equal. It is advised to implement our own equality criterion for Objects by overriding the equals(Object obj) method. Java training in Chennai comprehends more about object classes and other concepts to make you master Java programming.

finalize() method

Just before an object is collected for garbage, this procedure is invoked. When the garbage collector judges that there are no more references to an object, it is referred to as the garbage collector. For system resource disposal, cleanup tasks, and to reduce memory leaks, we should override the finalize() method. For instance, always call finalize method to carry out session cleanup tasks before removing the Servlet objects web container. Learn the Java Course in Chennai to get the guidance of competent real-time professionals and placement assistance.

getClass() method

To determine the object’s real runtime class, it returns the class object of “this” object. The class’s metadata can also be obtained using it. The object that is locked by the represented class’s static synchronized methods is the Class object that is returned. Since it is final, we won’t override it.

clone() method

It gives back a brand-new object that is an identical replica of the original. 

wait(), notify() notifyAll() 

These three concepts wait(), notify(), and notifyAll() are Concurrency-related. Master the Java programming language with our Java training in Chennai. Join now.

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