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Arguments are passed to methods as parameters and are used to input data into a method. These arguments can be primitives, objects, or both. A method may have many or zero parameters. Passing data to a method has different characteristics depending on whether the data is a primitive or an object. This section will review how method parameters are used and defined. The difference between passing primitives by value, and objects by reference, will also be covered.
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Method parameters represent the arguments that were used when the method was called. A method may have many parameters or none at all. A developer defines the parameters for a method in the method declaration. A method s declaration consists of the following parts: modifiers such as public or private, a return type, the method name, a list enclosed in parentheses of parameters that are comma-delimited and are preceded by their data type, an exception list, and the code of the method
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enclosed in braces. At this time, disregard the modifier and exception list; they will be covered later in this book. The following is an example of a method declaration:
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void initializeLoanDetails(int months, float amount, float rate) { }
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In this example, void is the return type. Return types and returning data will be discussed later. The name of the method is initializeLoanDetails. The next item is the parameter list, which is enclosed in parentheses. This may be empty or contain the list of parameters. The parentheses must always be present even if they are empty, which would represent an empty parameter list. The parameter list must declare the data type and then the name of the variable. A comma is used to delimit the items in the list. Finally, the code of the method is enclosed in braces. The following is an example of a code segment that invokes this method:
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int numMonths = 12; float amountBorrowed = 12000.00; initializeLoanDetails(numMonths, amountBorrowed, 6.99);
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In this example, two variables are declared and literal values are assigned to them. Next, the initializeLoanDetails method is called. This method is given three arguments. Since the initializeLoanDetails method is defined with three parameters, the code that invokes it must pass three arguments. The calling code must match the data types defined in the method declaration. The arguments may be variables or literals as long as they match the data types of the method s parameters. When a parameter is defined in the parameter list, it is similar to declaring a variable in the method body. The data type that is given determines what data this parameter contains and the name given is the name of the variable. This parameter becomes a variable that can be used in code just as any other variable would be used. However, this variable comes preset to the value of the argument used to call the method. It is valid to set this variable to a different value if needed.
Passing Primitives by Value to Methods
When a primitive is used as an argument, a copy of the value is made and given to the method. If the method sets the value of the parameter to a different value, it has no effect on the variable that was passed to the method. The following is an example of a method that adds two to the int that is passed to it:
void addTwo(int value) { System.out.println("Parameter: value = " + value); value = value + 2; System.out.println("Leaving method: value = " + value); }
5:
Understanding Variable Scope and Class Construction
Since primitives are passed by value, a copy of the variable value is passed to the method. Even though the method modifies the parameter (since it is just a copy of the original argument used to invoke the method), the original argument remains unchanged from the perspective of the calling code. The following is a code segment that could be used to call this method:
int value = 1; System.out.println("Argument: value = " + value); addTwo(value); System.out.println("After method call: value = " + value);
If this code segment was executed, it would produce the following results. Read the output that follows and walk through the code.
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