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out Some readers will look to this book to help diagnose installation and configuration problems, but even with the best will in the world we just can t cover the range of platforms that Java will support The best place to look for guidance in this area is the documentation which is supplied with the JDK and the Sun Java Web servers So, for our example, we just type: javac HelloWorldjava The compiler will take the source file and generate a byte-code file called HelloWorldclass Dealing with syntax errors The Java compiler, as with most compilers, will perform syntax checks on the source code as part of the compilation process These check for syntax errors and ensure that you have created source code which conforms to the definition of the Java language So, for example, if instead of typing this line in our example: public static void main (String args[]) { we typed: main (String args[]) { and recompiled it, the javac compiler would report the following error: HelloWorldjava:4: Invalid method declaration; return type required main (String args[]) { ^ 1 error This error indicates that a method in Java must declare what will be returned to the calling method Even methods that do not return anything must explicitly say so by using the void keyword You can see that the compiler has also stated that the error has been encountered in line four of the source file Since blank lines are taken into account this may not be the fourth line of code The Java compiler tries to continue compiling after encountering an error, so that as many problems can be identified in one pass as possible However, this may mean that the same error can generate a whole raft of errors as the compiler finds related problems further into the source file For example, instead of declaring a String correctly we could have typed: sTring someString; and then compiled the source file Not only would the compiler complain about the real error but it would also generate an error each time that the String was referenced For example, if someString was assigned a value from calling a method which returned a String, the compiler would complain about an invalid cast between String and sTring Most compilers do this and it is not something specific to the Java system, but it is worth looking at the errors that are generated from a source file and seeing how many of them are caused by one problem being encountered over and over again In addition to errors, the Java compiler can also issue warnings A common warning is creating a file which contains a public class that is not named after the file The compiler will continue to compile after a warning, but it is an indication that the developer is not following the guidelines that the compiler expects to work with In our experience it is worth fixing the problems that the warnings disclose, if only to prevent you becoming desensitized to real errors when they are reported Syntax errors are, of course, the simplest to handle and report After all, the design of the Java language is well defined and the compiler knows what the rules are When source code does not conform to these rules there is a clear case of an error and the compiler can make a clean ut decision about syntax based on the relatively simple model of the language definition There is another kind of error which a compiler rarely detects and that is a conceptual flaw in the.

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A fixed-decimal number is one that has a fixed-decimal precision For example, DECIMAL( 7,2) has a precision of seven digits, with a fixed scale the umber of digits after the decimal point of two digits If the data type of a column is DECIMAL, then the actual precision must be at least as big as the defined precision If the data type of a column is NUMERIC, then the actual precision should be exactly the same as the defined precision, but in practice most DBMSs treat NUMERIC as a synonym for DECIMAL Any numeric literal can take three forms, as shown in Table 7-9 Notice that Table 7-9 shows that the number 177 is a DECIMAL not a FLOAT This can confuse C programmers because in C the literal value 177 is a float All DBMSs except for InterBase and MySQL store DECIMAL values as a packed string of decimal digits, usually with two decimal digits per byte; see the sidebar "Oracle Numbers" InterBase, as mentioned earlier, stores decimal values inside integers, while MySQL stores them as unpacked strings Table 7-9 Forms of a Numeric Literal Form Data type Digits and no decimal point INTEGER Digits with decimal point DECIMAL Exponential notation FLOAT. Example 537 177 132E15. Make UPC-A Supplement 2 In .NET Framework Using Barcode generator for VS .Related: 

design of the program This can be thought of as the developer writing code hich is syntactically correct but which is flawed in the logic of the design You will encounter these errors more frequently than you would like and you will often have to trace the progression of your code through execution to determine what is happening There are two main approaches to debugging code in this manner The first, and most basic, is to insert lines of code at key points in the source code which print out a line of information regarding the progress of the execution or possibly the value of a variable These lines would typically be moved by the developer as the problems are narrowed down to a specific area of the code This approach is effective for simple problems in small amounts of code, but does not scale up to handling complex problems in large code bases The other approach is to use a debugger This allows the developer to control the execution of the program manually on a step-by-step basis and check the way that methods are called and the value of variables at each step of progression Dealing with syntax errors In order to make use of the Java debugger jdb, you must compile your source code using the -g flag for the javac compiler This flag allows the compiler to build into the final class file the required information that jdb will use to debug the file To use the debugger, you simply call the binary and specify the Java target So, for example, if we wanted to debug our simple example, we would first compile the java file using the debug flag for the compiler: javac -g HelloWorldjava and then call the debugger with: jdb HelloWorld The model of operation for this type of debugger is to specify a break-point somewhere in the code A break-point is a point in the source code which will cause the debugger to stop execution and hand over control to the developer Exceptions that are not caught by methods, or are unexpected, are also considered as break-points so the debugger will stop there as well The use of break-points lets the debugger run the program automatically until the execution reaches the area which interests the developer At that point, it is possible to step through the execution of the code, one line at a time, to see in greater detail what is happening Because, after each line is executed, the debugger can read the value of any variable it is a useful way of seeing where design problems manifest themselves 922 Running Java code Once you have created a Java file and compiled it so that there are no syntax errors you will want to run the code We have covered the general debugging concepts before this section because they fit more comfortably with the compilation process However, only the syntax errors will have been detected and fixed by the time that the compiler generates a usable class file, so any conceptual errors which you have made will not show up until you try to run the software Some errors may take hours or weeks of use to show up, because the problems increment slowly and the effect takes some time to become noticeable, or because the code which generates the problems is so deeply tucked away into the program structure that it is not often called during normal use Regardless of this, you will still need to run the code Running an application To run an application you will need to call the Java run-time interpreter and ask it to process the class file that you have compiled If your application consists of multiple classes, and hence has multiple class files, you need only enter the name of the class which contains the main() method Continuing with our example, to run the HelloWorld application we would type: java HelloWorld.

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All DBMSs except Oracle use similar numeric formats, so look for our Oracle-specific recommendations only if you use Oracle Any number with a scale of zero (no digits after the decimal point) should be in an INTEGER column INTEGER is the default data type of any literal that contains all digits SMALLINT is the only other SQL Standard data type and is usually just half the size of INTEGER TINYINT is the smallest integer data type and is still large enough for most personal information BIGINT is appropriate for numbers larger than two billion though working with compilers that can't handle such large numbers could be problematic Floating-point operations are fast if they go through the computer's FPU When you install a DBMS, the installer should detect the FPU automatically and bring in the right code, whether FPU dependent or emulated, so make sure you erun the install program after hardware upgrades The primary advantage of DECIMAL is that it is easy to cast to CHAR, because the number isn't stored in binary form The primary disadvantage of DECIMAL is that it must be converted to binary form before some arithmetic operations can be performed on it Serial data types are useful for ensuring each row of a table has a unique identifier The problem with serials is that they can cause trouble with concurrency control Recommendation if you don't use Oracle: Prefer INTEGER for integers unless maximum values including those from arithmetic operations exceed the INTEGER range Prefer DECIMAL for fixeddecimal numbers and for most floats Prefer DOUBLE PRECISION for floats where DECIMAL isn't appropriate Prefer INTEGER for serials and do your own value assignments Recommendation if you use Oracle: Data type doesn't really matter because all numbers are stored the same Avoid multiply and divide because the packed decimal numbers will have to be converted before they can be operated on Allow free space on each page because rows are all variable-length Don't worry about floating-point storage because it's not there.

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"String of Bits" Data Types columns o While IBM does not provide either a BINARY or VARBINARY data type for bit or binary string data, the DBMS provides the same functionality through the FOR BIT DATA attribute A column defined as CHAR(8) FOR BIT DATA is equivalent to a column defined as BINARY(8), and a column defined as VARCHAR(8) FOR BIT DATA is equivalent to a column defined as VARBINARY(8) o Informix's CHAR data type is really a fixed-length "string of bits" type If you want collations and dictionary sorts, you have to use Informix's NCHAR o Ingres, Microsoft, Oracle, and Sybase all have a binary string data type Ingres uses the terms BYTE and BYTE VARYING, Microsoft and Sybase call them BINARY and VARBINARY, and Oracle has a RAW data type (fixed-size only) "Logical" Data Types columns o Informix's BOOLEAN doesn't provide full SQL Standard BOOLEAN support, although it does allow you to store three values: 0/1/NULL o The Microsoft/Sybase BIT data type is for logical data but allows only two values 0/1 to be inserted The SQL Standard logical data type, BOOLEAN, requires support for three values: true/false/unknown o While MySQL does have a BIT data type, it is only a synonym for CHAR(1) a fixed-size character tring one character long This provides no support for bit strings, nor does it provide true support for logical data.

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