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design of the program This can be thought of as the developer writing code which 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 rder 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. vb.net read barcode from camera Barcode Scanner in VB.net - MSDN - Microsoft
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