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The differences between the 8-bit Latin-1, CP850 (an IBM PC encoding), and UTF-8 encodings make it clear that guessing encodings is not likely to be a successful strategy Fortunately, UTF-8 is becoming the de facto standard for plain text les, so later generations may not even know that other encodings ever existed Python py les use UTF-8, so Python always knows the encoding to use with string literals This means that we can type any Unicode characters into our strings providing our editor supports this When Python reads data from external sources such as sockets, it cannot know what encoding is used, so it returns bytes which we can then decode accordingly For text les Python takes a softer approach, using the local encoding unless we specify an encoding explicitly Fortunately, some le formats specify their encoding For example, we can assume that an XML le uses UTF-8, unless the < xml > directive explicitly speci es a different encoding So when reading XML we might extract, say, the rst 1 000 bytes, look for an encoding speci cation, and if found, decode the le using the speci ed encoding, otherwise falling back to decoding using UTF-8 This approach should work for any XML or plain text le that uses any of the single byte encodings supported by Python, except for EBCDIC-based encodings (CP424, CP500) and a few others (CP037, CP864, CP865, CP1026, CP1140, HZ, SHIFT-JIS-2004, SHIFT-JISX0213) Unfortunately, this approach won t work for multibyte encodings (such as UTF-16 and UTF-32) At least two Python packages for automatically detecting a le s encoding are available from the Python Package Index, pypipythonorg/pypi

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class SimplePoint extends Point { void alert() { } }

for more information You can use Sun s Java Plug-in Software to run the applet in Netscape Navigator or in Internet Explorer See the instructions on the javasuncom Web site at http://javasuncom/products/plugin/ for more information Java Plug-in Software (starting from version 12) supports applets signed using the Java 2 security tools If a signed applet is trusted, that applet is allowed full permission, which includes permissions to connect to other systems on the network Note that in Java Plug-in Software 122, Sun introduced support for applets signed with RSA keys This means you can use Netscape s signtool utility to sign applets for Java Plug-in Software If you use this method for signing your applet, you

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In this section we will draw on what we have covered in this chapter and the one before, to present two small but complete programs to help consolidate what we have learned so far The rst program is a bit mathematical, but it is quite short at around 35 lines The second is concerned with text processing and is more substantial, with seven functions in around 80 lines of code

Point p = new Point();

Quadratic equations are equations of the form ax2 + bx + c = 0 where a 0 describe parabolas The roots of such equations are derived from the formula

do not need to install the certi cate manually on each user s machine If you use the Java 2 security tools to sign the applet, you will need to install the certi cate manually on each machine For details on using signtool, see the previous section on writing applets for Netscape Navigator The section that follows explains how to use the Java 2 security tools to sign an LDAP applet

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would result in a compile-time error; the class Point cannot be instantiated because it is abstract However, a Point variable could correctly be initialized with a reference to any subclass of Point, and the class SimplePoint is not abstract, so the statement:

b2 2

When you are ready to test your applet, you should sign your code with your digital certi cate and package your code with the digital signatures into a JAR le To sign your code, you need the following: A certi cate and the corresponding private key (you can request the certi cate from your company s certi cate authority or from an independent authority, such as VeriSign) The certi cate of the certi cate authority who issued your certi cate The Java 2 security tools (which are included with Java 2) You can generate a public-private key pair and issue a request for a certi cate by using the keytool utility, which is provided with Java 2 The keytool utility puts the keys and certi cate in a database called a keystore Each entry in the keystore (an entry contains the key and certi cate) is assigned a unique alias You access the entry for the key and certi cate by specifying the alias for the entry Before you sign your code, read the documentation on security in Java 2, which is available at

Point p = new SimplePoint();

x = b 2a 4ac The b 4ac part of the formula is called the discriminant if it is positive there are two real roots, if it is zero there is one real root, and if it is negative there are two complex roots We will write a program that accepts the a, b, and c factors from the user (with the b and c factors allowed to be 0), and then calculates and outputs the root or roots First we will look at a sample run, and then we will review the code

interface Colorable { void setColor(int color); } abstract class Colored implements Colorable { abstract int setColor(int color); }

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