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What is an object in Java and what are its benefits?
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Answer / sumit pal singh
An object in java is a runtime entity of a java class. It has two characteristics 1. State (variables) and 2. Behavior (methods). It has below benefits
1. By creating the object of one class into another class we can get the state and behaviour of another class . i.e. Composition is best example for using the object.
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Answer / amit
In Java,The object will have its own state and access to all of the behavior defined by the class.
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Object is an instance of a class. The object will have its own state and access to all of the behavior defined by the class.
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An object in java is a runtime entity of a java class. It has two characteristics 1. State (variables) and 2. Behavior (methods). It has below benefits
1. Encapsulation (Data hiding): It hides data and internal implementation from other objects.
2. Modularity (task modulation): It contains a set of activities for a specific task of an application.
3. Reusability: It facilitates reusability of functionality through inheritance.
4. Easy maintenance: It enhance the readability and understandability of an application. It also helps the developer to trace bugs in an application.
5. Pluggable/Unpluggable: An erroneous/unwanted object can be removed and a new object can be added in an application.
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public class AboutStrings{ public static void main(String args[]){ String s1="hello"; String s2="hel"; String s3="lo"; String s4=s2+s3; //to know the hash codes of s1,s4. System.out.println(s1.hashCode()); System.out.println(s4.hashCode()); // these two s1 and s4 are having same hashcodes. if(s1==s4){ System.out.println("s1 and s4 are same."); }else System.out.println("s1 and s4 are not same."); } } Somebody told me that, == operator compares references of the objects. In the above example even though s1 and s4 are refering to same object(having same hash codes), it is printing s1 and s4 are not same. Can anybody explain in detail why it is behaving like this? Thanks in Advance RavuriVinod
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