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Building a Java program

Building a Java program There are several other issues you must understand before seeing your first Java program. Name visibility A problem in any programming language is the control of names. If you use a name in one module of the progra
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Coding style

Coding style The unofficial standard in Java is to capitalize the first letter of a class name. If the class name consists of several words, they are run together (that is, you don’t use underscores to separate the names) and the first letter o
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Casting operators

Casting operators The word cast is used in the sense of “casting into a mold.” Java will automatically change one type of data into another when appropriate. For instance, if you assign an integral value to a floating-point variable, the compil
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Mathematical operators

Mathematical operators The basic mathematical operators are the same as the ones available in most programming languages: addition (+), subtraction (-), division (/), multiplication (*) and modulus (%, produces the remainder from integer divisi
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String operator +

String operator + There’s one special usage of an operator in Java: the + operator can be used to concatenate strings, as you’ve already seen. It seems a natural use of the + even though it doesn’t fit with the traditional way that + is used.
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Introduction to objects

Introduction to objects Why has object-oriented programming had such a sweeping impact on the software development community? Object-oriented programming appeals at multiple levels. For managers, it promises faster and cheaper development
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You manipulate objects with handles

You manipulate objects with handles Each programming language has its own means of manipulating data. Sometimes the programmer must constantly be aware of what type of manipulation is going on. Are you manipulating the object directly or are
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Introduction to Seam

Introduction to Seam The preceding two chapters   covered  the EJB3 and JSF frameworks,   which  are the core components of Seam.  In those  chapters,   you learned a simplistic  way of designing  both presentation
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Common pitfalls when using operators

Common pitfalls when using operators One of the pitfalls when using operators is trying to get away without parentheses when you are even the least bit uncertain about how an expression will evaluate. This is still true in Java. An extremely
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Relational operators

Relational operators Relational operators generate a boolean result. They evaluate the relationship between the values of the operands. A relational expression produces true if the relationship is true, and false if the relationship is untrue.
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You never need to destroy an object

You never need to destroy an object In most programming languages, the concept of the lifetime of a variable occupies a significant portion of the programming effort. How long does the variable last? If you are supposed to destroy it, when sh
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Methods, arguments and return values

Methods, arguments and return values Up until now, the term function has been used to describe a named subroutine. The term that is more commonly used in Java is method, as in “a way to do something.” If you want, you can continue thinking i
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Creating new data types: class

Creating new data types: class If everything is an object, what determines how a particular class of object looks and behaves? Put another way, what establishes the type of an object? You might expect there to be a keyword called “type” and th
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Shift operators

Shift operators The shift operators also manipulate bits. They can be used solely with primitive, integral types. The left-shift operator (<<) produces the operand to the left of the operator shifted to the left by the number of bits speci
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Bitwise operators

Bitwise operators The bitwise operators allow you to manipulate individual bits in an integral primitive data type. Bitwise operators perform boolean algebra on the corresponding bits in the two arguments to produce the result. The bitwise op
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You must create all the objects

You must create all the objects When you create a handle, you want to connect it with a new object. You do so, in general, with the new keyword. new says, “Make me a new one of these objects.” So in the above example, you can say: Stri
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Ternary if-else operator

Ternary if-else operator This operator is unusual because it has three operands. It is truly an operator because it produces a value, unlike the ordinary if-else statement that you’ll see in the next section of this chapter. The expression is of
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Using Java operators

Using Java operators An operator takes one or more arguments and produces a new value. The arguments are in a different form than ordinary method calls, but the effect is the same. You should be reasonably comfortable with the general concept
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EJB3 Fundamentals

EJB3 Fundamentals This begins  the second  and final of our “fundamental”    chapters,   and if you are not famil- iar with Enterprise JavaBeans  (EJBs) at all, then definitely  take a close look at this chapter. Beca
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JSF Fundamentals

JSF Fundamentals As mentioned in Chapter  1, there are two component pieces  that Seam uses to provide seamless  integration   between frameworks.   The first component that I am going to dis- cuss is the presentatio
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