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This approach can be taken one step further An immutable object can provide static factories that cache frequently requested instances and avoid creating new instances whenever a preexisting instance is requested The BigInteger and Boolean classes both have such static factories Using such static factories causes clients to share preexisting instances rather than creating new ones, reducing memory footprint and garbage collection costs A consequence of the fact that immutable objects can be shared freely is that you never have to make defensive copies (Item 24) In fact, you never have to make any copies at all because the copies would be forever equivalent to the originals Therefore you need not and should not provide a clone method or copy constructor (Item 10) on an immutable class This was not well understood in the early days of the Java platform, so the String class does have a copy constructor, but it should rarely, if ever, be used (Item 4) Not only can you share immutable objects, but you can share their internals For example, the BigInteger class uses a sign-magnitude representation internally The sign is represented by an int, and the magnitude is represented by an int array The negate method produces a new BigInteger of like magnitude and opposite sign It does not need to copy the array; the newly created BigInteger points to the same internal array as the original Immutable objects make great building blocks for other objects, whether mutable or immutable It's much easier to maintain the invariants of a complex object if you know that its component objects will not change underneath it A special case of this principle is that immutable objects make great map keys and set elements; you don't have to worry about their values changing once they're in the map or set, which would destroy the map or set's invariants The only real disadvantage of immutable classes is that they require a separate object for each distinct value Creating these objects can be costly, especially if they are large For example, suppose that you have a million-bit BigInteger and you want to complement its low-order bit:.

Now that your first Java project has been created and you have explored different ways to navigate the system and find the items needed, it is time to start using Eclipse tools to write new code Eclipse supports a number of different editor types, both internal and external, for editing different types of resources Double- clicking on a Java file, for example, opens the Java editor (see Figure 1 37)

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The programs that we explored in s 1 and 2 did little more than read a single string and write it again, sometimes with decoration Most problems are more complicated than such simple programs can solve Among the most common sources of complexity in programs is the need to handle multiple pieces of similar data Our programs have already started doing so, in the sense that a string comprises multiple characters Indeed, it is exactly the ability to put an unknown number of characters into a single object-a string-that makes these programs easy to write In this chapter, we'll look at more ways of dealing with batches of data, by writing a program that reads a student's exam and homework grades and computes a final grade Along the way, we'll learn how to store all the grades, even if we don't know in advance how many grades there are

The Java editor provides many features that focus on the job of editing Java code, including the following: Colored syntax highlighting (see Figure 1 37) User-defined code formatting Import organization and correction Context-sensitive code assistance Quick fix automatic problem correction

Tip: Many former VisualAge for Java users loved the ability of that IDE to show only a single method at a time rather than the entire Java file The Eclipse Java editor supports the same capability via the Show Source of Selected Element Only toolbar button For it to work, you must give focus to an editor since the button is not enabled until you re actually editing some code This is one of those options in Eclipse that should be a workspace preference rather than a toolbar button

Imagine a course in which each student's final exam counts for 40% of the final grade, the midterm exam counts for 20%, and the average homework grade makes up the remaining 40% Here is our first try at a program that helps students compute their final grades:

Buildfile: mutability_test_5xml init: [echo] in sub, foo=${foo} [echo] in sub, foo=xyz [echo] in init, foo=xyz [echo] in sub, foo=xyz [echo] in sub, foo=xyz [echo] in init, foo=xyz test: [echo] in test, foo=xyz [echo] in sub, foo=xyz [echo] in sub, foo=xyz [echo] in test, foo=xyz BUILD SUCCESSFUL Total time: 437 milliseconds

BigInteger moby = ; moby = mobyflipBit(0);

#include #include #include #include <iomanip> <ios> <iostream> <string> using std::setprecision; using std::string; using std::streamsize;

Several of the tasks just listed are not part of Ant; some are part of Eclipse The additional tasks listed in Table 19 3 will not work outside of Eclipse

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