Step Over Expression Resume Stop Step Out in Java

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Pause
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Figure 4-20
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The Debug toolbar
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Five buttons enable you to progressively execute lines of code:
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Step over Line: Executes the current line of code and stops before running the following line Step over Expression: Executes a method call within a line of code and remains within that line unless the whole line has now been executed, at which point it steps to the next line Step Into: Behaves like Step over Line unless the current expression is a function call, in which case it steps into the function and stops on its first executable line Step Out: Executes the rest of the current function and steps out, stopping at a point immediately after that at which the function was invoked Run to Cursor: Resumes the application and runs until the flow of control reaches the current location of the cursor or until another breakpoint is reached
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If you now click the Step over Line button, NetBeans allows the code on line 113 of Listing 4-1 to be executed and then pause the application again Line 113 adds the value
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of the variable snowFallDistance, which was just changed from 4 to 8, to the y coordinate of the snowflakeYou can see the result in Figure 4-21As you can see, the y coordinate of the snowflake changed from 0 to 8, indicating that the change that was made to the variable in the Changing Variable Values section, earlier in this chapter, was effective
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Figure 4-21
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Disabling and Removing Breakpoints and Resuming Execution
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After you have inspected and possibly corrected the state of an application, you usually want to resume executionYou do this by clicking the Resume button on the Debug toolbar, which is the green one to the left of center in Figure 4-20The application then runs until it terminates or hits another breakpoint If you don t want it to stop at a breakpoint any more, you can either disable or remove that breakpoint To disable a breakpoint, move the cursor to the margin of the line on which the breakpoint has been set and right-click to open the context menu shown in Figure 4-22
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Figure 4-22
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Open the Disabled Breakpoint submenu and click the Enabled item to toggle its state to DisabledThe highlight color on the breakpointed line will change to indicate that the breakpoint is disabledA disabled breakpoint does not cause execution to stop, but it can
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be reenabled later by following the same sequence of steps By contrast, if you remove the breakpoint, which you can do by simply clicking in the margin of the breakpointed line, NetBeans loses track of it It is better to disable a breakpoint than to remove it if you think you might need to use it again later
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Profiling the SnowStorm Application
After you ve completed, debugged, and deployed your application, you can sit back and wait for the compliments to flood in from your users, or at least that s what you hope Sometimes, however, they complain Even an application that appears to be functionally correct can have problems, and among these, perhaps the hardest to deal with is a performance problem Performance problems come in two different flavors: either the application runs too slowly (or hogs too much resource and causes the user s PC to run slowly) or it chews up more and more memory, which can make everything slow down The easiest way (and sometimes the only practical way) to solve a performance problem is to use a profiler Profiling should be a routine part of the development process, because it can help to find bottlenecks and memory leaks before they become a problem in your production environment The NetBeans IDE includes a powerful and easy-to-use profiler that can monitor the CPU usage of your application and its memory consumption In this section, we ll use it to examine the runtime performance characteristics of the SnowStorm applicationThere is also a freestanding profiler called jvisualvm that is based on the one in NetBeans If you have Java 6 update 7 or later installed, you ll find it in the same folder as the rest of the JDK tools Once you have seen how to use the NetBeans profiler, you will find it easy to use jvisualvmYou can find more information at http://visualvmdevjavanet