Calling an Object's Methods in Java

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Calling an Object's Methods
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You also use qualified names to call an object's method To form the qualified name of a method, you append the method name to an object reference, with an intervening period () Also, you provide, within enclosing parentheses, any arguments to the method If the method does not require any arguments, use empty parentheses
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objectReference methodName (argumentList );
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objectReference methodName ();
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TheRectangle class has two methods: area to compute the rectangle's area and move to change the origin Here's the CreateObjectDemo code that calls these two methods:
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Systemoutprintln("Area of rect_one: " + rect_onearea()); Java Tutorial, Third Edition: A Short Course on the Basics, The rect_twomove(40, 72);
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The first statement calls rect_one'sarea method and displays the results The second line moves rect_two because the move method assigns new values to the object's originx and originy
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Publisher Pub Date : Addison Wesley
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As with instance variables, objectReference must be a reference to an object You can use a ISBN : 0-201-70393-9 variable name, but you also can use any expression that returns an object reference The new operator Pages an object reference, so you can use the value returned from new to call a new object's : 592 returns methods:
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new Rectangle(100, 50)area()
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"This book stands above the rest because it has been available on the web and read by thousands of Java programmers Rectangle(100, 50) returns an object reference that refers to a Rectangle The expression new The authors have received an enormous amount of feedback about which sections are good and which sections are confusing; the confusing new have been 'sarea method to that any object As shown, you can use the dot notation to call the ones Rectangleimproved I doubt compute other Java the has undergone the area of booknew rectangle such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/
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Some methods, such as area, return a value For methods that return a value, you can use the Whether you're taking a class or learning on the job, value to a variable, use it Edition , is a handsmethod call in expressions You can assign the returnThe Java(TM) Tutorial, Thirdto make decisions, or on guide loop This code assigns the value returned by area to a variable: control a that lets you quickly become proficient with the Java programming language Written by members of the Java Software team at Sun Microsystems, the book uses an interactive approach to help you learn the Java platform by example
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int areaOfRectangle = new Rectangle(100, 50)area();
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Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated Remember, invoking a reader feedback and new releases of same as sending a message to that object continuously to reflect method on a particular object is the the Java platform This third edition has In this case, the object that area is invoked on is the rectangle returned by the constructor been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding versions as early as JDK 11
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A Word aboutclear explanations of such fundamentals as objects, classes, and data structures In You will find Method Access addition, the book provides introductions to object-oriented programming, applet construction, and user interface design Other topics include exceptions, all and threads To so they are accessible to The methods in our Point and Rectangle classes areI/O,declared public,help beginners avoid many common class Sometimes, chapter is devoted to programming problems and example, a class might any othermistakes, an entire a class needs to restrict access to its methods Fortheir solutions Convenient summaries at the end of each section are new to this edition Also new for this edition have a method that only subclasses are allowed to call A class can use the same mechanism to are "Questions and Exercises" sections to help you practice what you learn control access to its methods as it uses to control access to its variables To learn more about the access control mechanism, refer to the section Controlling Access to Members of a Class (page 193) After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming language in your school or workplace
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