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Problems with Native Methods
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Native methods seem to offer great promise, because they enable you to gain access to your existing base of library routines, and they offer the possibility of faster run-time execution But native methods also introduce two significant problems: Potential security risk Because a native method executes actual machine code, it can gain access to any part of the host system That is, native code is not confined to the Java execution environment This could allow a virus infection, for example For this reason, applets cannot use native methods Also, the loading of DLLs can be restricted, and their loading is subject to the approval of the security manager Loss of portability Because the native code is contained in a DLL, it must be present on the machine that is executing the Java program Further, because each native method is CPU- and operating-system-dependent, each DLL is inherently nonportable Thus, a Java application that uses native methods will be able to run only on a machine for which a compatible DLL has been installed The use of native methods should be restricted, because they render your Java programs nonportable and pose significant security risks
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Part ll: The Java Library
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13: 14: 15: 16: 17: 18: 19: 20: 21: String Handling Exploring java lang javautil Part 1: The Collections Framework javautil Part 2: More Utility Classes Input/Output: Exploring javaio Networking The Applet Class Event Handling Introducing the AWT: Working with Windows,Graphics, and Text Using AWT Controls,Layout Managers,and Menus - 234 -
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22: 23: 24: Images Additional Packages
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13: String Handling
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Overview
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A brief overview of Java's string handling was presented in 7 In this chapter, it is described in detail As is the case in most other programming languages, in Java a string is a sequence of characters But, unlike many other languages that implement strings as character arrays, Java implements strings as objects of type String Implementing strings as built-in objects allows Java to provide a full complement of features that make string handling convenient For example, Java has methods to compare two strings, search for a substring, concatenate two strings, and change the case of letters within a string Also, String objects can be constructed a number of ways, making it easy to obtain a string when needed Somewhat unexpectedly, when you create a String object, you are creating a string that cannot be changed That is, once a String object has been created, you cannot change the characters that comprise that string At first, this may seem to be a serious restriction However, such is not the case You can still perform all types of string operations The difference is that each time you need an altered version of an existing string, a new String object is created that contains the modifications The original string is left unchanged This approach is used because fixed, immutable strings can be implemented more efficiently than changeable ones For those cases in which a modifiable string is desired, there is a companion class to String called StringBuffer, whose objects contain strings that can be modified after they are created Both the String and StringBuffer classes are defined in javalang Thus, they are available to all programs automatically Both are declared final, which means that neither of these classes may be subclassed This allows certain optimizations that increase performance to take place on common string operations One last point: To say that the strings within objects of type String are unchangeable means that the contents of the String instance cannot be changed after it has been created However, a variable declared as a String reference can be changed to point at some other String object at any time
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