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The last control statement is return The return statement is used to explicitly return from a method That is, it causes program control to transfer back to the caller of the method As such, it is categorized as a jump statement Although a full discussion of return must wait until methods are discussed in 6, a brief look at return is presented here At any time in a method the return statement can be used to cause execution to branch back to the caller of the method Thus, the return statement immediately terminates the method in which it is executed The following example illustrates this point Here, return causes execution to return to the Java run-time system, since it is the run-time system that calls main( )
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// Demonstrate return class Return { public static void main(String args[]) { boolean t = true;
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Part I:
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The Java Language
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Systemoutprintln("Before the return"); if(t) return; // return to caller Systemoutprintln("This won't execute"); } }
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The output from this program is shown here: Before the return As you can see, the final println( ) statement is not executed As soon as return is executed, control passes back to the caller One last point: In the preceding program, the if(t) statement is necessary Without it, the Java compiler would flag an unreachable code error because the compiler would know that the last println( ) statement would never be executed To prevent this error, the if statement is used here to trick the compiler for the sake of this demonstration
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Introducing Classes
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he class is at the core of Java It is the logical construct upon which the entire Java language is built because it defines the shape and nature of an object As such, the class forms the basis for object-oriented programming in Java Any concept you wish to implement in a Java program must be encapsulated within a class Because the class is so fundamental to Java, this and the next few chapters will be devoted to it Here, you will be introduced to the basic elements of a class and learn how a class can be used to create objects You will also learn about methods, constructors, and the this keyword
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Classes have been used since the beginning of this book However, until now, only the most rudimentary form of a class has been used The classes created in the preceding chapters primarily exist simply to encapsulate the main( ) method, which has been used to demonstrate the basics of the Java syntax As you will see, classes are substantially more powerful than the limited ones presented so far Perhaps the most important thing to understand about a class is that it defines a new data type Once defined, this new type can be used to create objects of that type Thus, a class is a template for an object, and an object is an instance of a class Because an object is an instance of a class, you will often see the two words object and instance used interchangeably
The General Form of a Class
When you define a class, you declare its exact form and nature You do this by specifying the data that it contains and the code that operates on that data While very simple classes may contain only code or only data, most real-world classes contain both As you will see, a class code defines the interface to its data A class is declared by use of the class keyword The classes that have been used up to this point are actually very limited examples of its complete form Classes can (and usually do) get much more complex A simplified general form of a class definition is shown here: class classname { type instance-variable1; type instance-variable2;
Part I:
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