Java: Practical Guide for Programmers by Michael Sikora

By Michael Sikora

Solar Microsystems estimates the dimensions of the Java developer marketplace to be 2.5 million and rising). As advertisement companies flow over from buyer server structures to constructing multi-tiered web-based platforms, this viewers will keep growing. This ebook is exclusive in that it covers loads of flooring in a small variety of pages, utilizing examples and concentrated guideline to educate techniques. it's geared toward the reader who has event programming in one other language and is attracted to switching to Java. this is often additionally an ideal complement for classes in a variety in the CS curriculum and a couple of teachers surveyed have expressed enthusiasm for this actual booklet to be able to get all in their scholars up-to-speed quick on Java.

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Example text

The break statement can also be used to exit out of a for, while, or do while loop. The SumOddArguments program sums all the arguments until the first even-valued argument is reached. println(''Sum of odd arguments is : " + su } SumOdd Arguments In the for loop (lines 7–13), as soon as an even-valued argument has been reached, in line 9 arg % 2 is equal to 0; consequently, the break statement passes control to the first statement after the for loop, namely, line 14. The continue statement passes control to the next iteration of the enclosing for, while, or do while loop.

The Employee class consists of just one method, increment, which adds 10 to a supplied argument of type int. println(''amount within method: " + amount } } Employee The CreateEmployee application sets the variable amount to 500 and invokes the Employee class increment method with amount as an argument. println("amount outside method: " + amount } } CreateEmployee The output of running the CreateEmployee application follows: > java CreateEmployee amount within method: 510 amount outside method: 500 So although the increment method has increased the amount to 510, the amount in the calling program remains at 500.

If a method is void, use the statement return; to exit from the method. Note that control passes to the invoking method after the last statement in the current method, so a return statement is required in a void method only if we wish to prematurely exit from the method if some condition is met. For methods other than void, we need to use the statement return expression; where expression is the same data type as the current method's return type. For nonvoid methods, the last statement in the method must be a return statement.

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