122 Chapter 5 (Web site builder) Figure 5.3 The println() method
122 Chapter 5 Figure 5.3 The println() method is overloaded 10 times in the PrintStream class. The PrintStream class has 10 println() methods. How does the compiler know which one you want to invoke? If you look carefully, you will also notice that the parameter list is different for each version of println(). For example, calling println() and passing in an int invokes that overloaded version whose signature is as follows: public void println(int x) Invoking println() and passing in a String invokes the following version: public void println(String x) If method overloading were not an option, the println() methods would each have to use a unique name such as printlnInt(), printlnString(), println- Double(), and so on. In this case, method overloading simplifies both the writing of the PrintStream class and the usage of the class. Developers do not need to remember 10 different names for printing a line of text to the system output; they can simply remember that the method to use is println(), and it is overloaded for every data type. Let s look at an example using method overloading. The following Calculator class contains five multiply() methods. Study the method signatures carefully and determine whether this is valid method overloading. public class Calculator { public int multiply(int x, int y) {
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