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A common use of overloading a method is to overload a constructor Previously in this chapter, you learned that a constructor is used with the new operator to create an instance of a class The default constructor doesn t have an argument list Programmers overload a constructor by defining a constructor that has a parameter list This is called a parameterized constructor You can use any number and type of arguments in the argument of a constructor There are many reasons for overloading a constructor A common reason is to enable a programmer to override values used to initialize instance variables This is illustrated in the next example, where two constructors are defined One constructor initializes the instance variable to zero, and the other constructor initializes the instance variable to whatever value is passed to the constructor by the programmer Two instances of myClass are created in this example The first instance is declared using the default value to initialize the instance variable The second instance uses the parameterized constructor, which is passed the number 354 The value of the instance variable is then displayed on the screen

1 On the Dock, click the System Preferences icon If you can t find it there,

At the top of the Design Journal page, in the Robot Name box, go ahead and write StringBot. Feel free to create your own name for the bot; names such as TwineBot, MonkeyBot, or Gort are

class Demo { public static void main (String args[]) { myClass x = new myClass(); myClass y = new myClass(354); xprint(); yprint(); } } class myClass { int student; myClass(){ student = 0; } myClass(int ID){ student = ID;

change the appearance and the highlight color of the windows you see You can also change the location of the scroll arrow, determine the number of recent items to show, and change the smooth font scaling values You can experiment with these settings to see which ones you like best

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} public void print(){ Systemoutprintln("Hello, student: " + student); } }

Under the Appearance option, try using Graphite it s a new grayscale option that many users prefer over Blue

available. (You get Big Bonus Points if you recognize the Gort reference.) Once you ve got your bot s name selected, it s time to work on the Robot Description.

A method member of a class has implicit access to instance variables and other method members of the class that defines a method member In previous examples throughout this book, you ve seen how a method member of a class is used to initialize an instance variable of the same class There will likely be occasions when you ll need to declare a variable in the definition of a method member that has the same variable name as an instance variable A variable that is declared within a method member is called a local variable Whenever a statement in a method member references a variable name, Java uses the local variable before an instance variable if both variables have the same name However, you can tell Java to use an instance variable rather than a local variable of the same name by using the this keyword The this keyword is a way to refer to the object of the class within the class definition Using the this keyword can be confusing to understand However, remember how you access a class member in your program First, you declare a reference to an instance of the class, and then you use the name of the reference whenever you want to refer to a member of the class For example, suppose we created an instance of a class and assigned it to the reference newClass Here s how you would access the display() method member of newClass, assuming such method member was defined in the class definition:

I don t like the screen effect (screensaver)

newClassdisplay()

Cause Screen effects, formerly called screensavers, give your monitor something to display when you are not using it You can select from several available screen effects, and you can even purchase Macintosh software that will give you many more if that is something you re heavily into The Painkiller To adjust the appearance of screen effects, follow these steps:

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