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CHAPTER 7 Classes
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} public void print(){ Systemoutprintln("Hello, student: " + student); } }
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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:
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newClassdisplay()
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In essence, you do the same thing when you want to access a class member from a method member of the same class However, the reference to the class is implied That is, you don t need to make reference to the instance of the class when accessing another member of the class Java assumes that you want to use a member of the class However, when there is a conflict, such as two variables having the same name, you must explicitly tell Java which one you want to use If you want to use the local variable, simply use the name of the variable If you want to use the instance variable, you ll need to reference the instance in the statement that accesses the instance variable
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No doubt you see a problem There can be many instances of the class, each having a different reference Therefore, you cannot refer to the reference of the instance in the class definition The solution is to use the this keyword in place of the reference name The this keyword tells Java to use the current instance The following example illustrates how to use the this keyword in a Java program This example defines a class called myClass that has three members: the instance variable student and two method members The first method member is a constructor that is used to initialize the instance variable The second method member is called display() The display() method member declares a local variable also called student, which is initialized with a value that is different from the value of the instance value Also in the display() method are two statements that display each variable on the screen One statement displays the local variable, and the other uses the this keyword to display the instance variable
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class Demo { public static void main (String args [] ) { myClass x = new myClass (); xdisplay(); } } class myClass { int student; myClass(){ student = 1234; } void display() { int student = 12; Systemoutprintln("Hello, student " + student); Systemoutprintln("Hello, student " + thisstudent); } }
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