![]() I will describe another important OO concept called nested class (or inner class) in this article. ![]() I shall assume that you have a good grasp of OOP, including composition, inheritance, polymorphism, abstract class and interface otherwise, read the earlier articles. However, re-using them are not so difficult, if you follow the API documentation, samples and templates provided. Writing your own graphics classes (and re-inventing the wheels) is mission impossible! These graphics classes, developed by expert programmers, are highly complex and involve many advanced design patterns. In this article, I shall show you how you can reuse the graphics classes provided in JDK for constructing your own Graphical User Interface (GUI) applications. These classes are self-contained and are reusable. You can create high-level abstract data types called classes to mimic real-life things. As discussed, OOP permits higher level of abstraction than traditional Procedural-Oriented Languages (such as C). If you add more code after return, the compiler will complain about unreachable code.So far, we have covered the basic programming constructs (such as variables, data types, decision, loop, array and method) and introduced the important concept of Object-Oriented Programming (OOP). Return statement is usually used to return a value from a function incase the function returns any value, else it is used to terminate a function if it returns void.Return would cause a program to exit, if it's present inside the main method of a class. The System.exit() call internally invokes the Runtime.getRuntime().exit(0). ![]() Output: Hello, You've reached the first print statementįrom the above example we can see that after the exit() method is called, JVM will terminate, the lines beyond this call are not executed. ("Hello, You've reached the first print statement") Different values can denote different kinds of Errors. Any other integer value when some error has occurred.Status values can be used to denote the outcome of the Program Exit can be disabled by the SecurityManager class. The System class contains several useful class fields and methods.Among the facilities provided by the System class are standard input, standard output, and error output streams access to externally defined properties and environment variables a means of loading files and libraries and a utility method for quickly copying a portion of an array.One such important method provided by System class is exit().This method terminates the currently running Java Virtual Machine.It takes a status code as a parameter.This method doesn't return any value. Halting the JVM itself using the Halt Method. ![]() This can be done from the terminal executing the program but can also be done from within the Java code.ĭifferent ways to terminate program in Java are: Terminating a program means to stop the execution of the program and more specifically, kill the process that was executing the program. Let us get started with Different ways to terminate program in Java. Generally, Java programs terminate when they reach the end of the program, but there may be times when we need to know how to terminate a program when a certain condition is met or an exception occurs.
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