visual basic 2008 barcode generator Accessing Members of a Class in Java

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Accessing Members of a Class
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Once an instance of a class is declared, a reference to the instance is used to access members of the class To access a member of the class, you use the name of the reference followed by the dot operator and then the name of the member You can see how this is done in the next example The following example defines the myClass class, which has three members These are an instance variable called student, a constructor, and a method member called print() The instance variable is assigned a student ID by the constructor when an instance is declared The instance is then used to call the print() method member The print() method member displays the student ID on the screen
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class Demo { public static void main (String args[]) { myClass x = new myClass(); xprint(); } } class myClass {
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CHAPTER 7 Classes
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int student; myClass(){ student = 1234; } public void print(){ Systemoutprintln("Hello, student: " + student); } }
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Overloading Member Methods
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In 6, you learned that Java identifies a method by its method signature, which is a combination of the method name and argument list This means that two methods can have the same name and different arguments The same is true about the method members of a class That is, a class can have multiple methods that have the same name as long as each method member s argument list is unique within the class definition Two method members of the same class cannot have the same method signature However, methods that are members of different classes can have the same method signature When there are two method members of the same class that have the same method name, programmers say that the second method overloads the first method As you ll recall from 6, programmers overload methods to reduce the number of methods that need to be learned Typically, methods that have the same name perform variations of the same task Instead of remembering a different name for each variation, a programmer only needs to remember one method name and the appropriate argument list This is illustrated in the next example, where two method members have the name print() One version doesn t have an argument list and displays a default greeting whenever it is called The other version enables the programmer to enter text that will be incorporated into the message As you can see, the programmer has the option to use the default greeting or to use a personal greeting
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class Demo { public static void main (String args[]) { myClass x = new myClass(); xprint(); xprint("Bob"); } } class myClass {
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public void print(){ Systemoutprintln("Hello"); } public void print(String str){ Systemoutprintln("Hello, " + str); } }
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Overloading a Constructor
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
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;
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