This data, memory vanished once the application is completed because RAM is temporary memory. The data stored in variables, objects of application allocates memory in different part of RAM only during the application execution. The process of saving and managing data for long time is called persistence. Utility api(java.util and its sub package) Jdbc api(java.sql, javax.sql and its sub packges) JDBC : => Persistence : => Saving data for long time and manage data for long time is called persistence. Third party APIs (given by other than above two) Popular Java APIs(built in api) (i)īuilt-in APIs (given by language/technology/framework) In java API means classes, interfaces, enums, annotations which come in form of packages. C++ API means set of functions, classes which comes in the form of header files. In c language API mean set of function which is in the form of header files. Every language technology and framework gives different API. APIs are base for developers to develop software applications. It is used Having English meaning based/platform API: Application Programming Interface Here the word interface is no way related to java interface. Q:- How can we develop java application without main method? Ans:public class DemoApp1 The above code runs in all java versions up to jdk1.6 and in the initial release of jdk1.7 but not in other version. b)In the process of creating first object for the class. JDBC a)When it is given to begin the execution.
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