Download e-book for iPad: Ground-Up Java by Philip Heller

By Philip Heller

ISBN-10: 0585496595

ISBN-13: 9780585496597

ISBN-10: 0782141900

ISBN-13: 9780782141900

This is often the 1st powerful Java publication for real novices. certain, books prior to now curious about simple innovations and key ideas, and a few even supplied operating examples on CD. nonetheless, they lacked the facility to rework anyone without programming event into anyone who sees, who fairly "gets it.Working with Ground-Up Java, you are likely to get it. this can be end result of the readability of Phil Heller's factors, and the easily flowing association of his guide. he is the most effective Java running shoes around.But what is rather innovative are his greater than 30 lively illustrations. every one of those small courses, visible and interactive in nature, vividly demonstrates how its resource code works. you could regulate it in numerous methods, highly changing the habit of this system. As you scan with those tools-and you could play with them for hours-you'll achieve either the talents and the elemental realizing had to whole each one chapter's workouts, which gradually bring up in sophistication. No different starting Java ebook can take you to this point, so quick, and none should be part as a lot enjoyable.

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For example, the following two methods could appear in the same program: static int getMass(int n) { … } static int getMass(double a, char c) { 50 Chapter 4: Methods Chapter 4: Methods 51 … } Here, getMass() is legitimately overloaded. However, the following two methods could not appear in the same program: static int getMass(int n) { … } static int getMass(int x) { … } The argument names are different, but that doesn't help. Both method versions have the same name, and each version takes a single argument of type int, so the compilation will fail.

This kind of structure—calls to calls to calls—is perfectly typical of programs. Passing by Value In formal computer terminology, we say that Java passes by value. This is just another way to say that methods get copies of their arguments and have no access to the original values. The alternative is called passing by reference, where methods work with the caller's data and not with copies. The latter is a perfectly valid way to design a language; it's just not the way Java does it. When a caller calls a method and the flow detours into the method's body, the JVM copies the argument values provided by the caller and gives the copies to the method.

For example, the following two methods could appear in the same program: static int getMass(int n) { … } static int getMass(double a, char c) { 50 Chapter 4: Methods Chapter 4: Methods 51 … } Here, getMass() is legitimately overloaded. However, the following two methods could not appear in the same program: static int getMass(int n) { … } static int getMass(int x) { … } The argument names are different, but that doesn't help. Both method versions have the same name, and each version takes a single argument of type int, so the compilation will fail.

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Ground-Up Java by Philip Heller


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