Introduction to shortcut keys in debug chapter

One 、Debug The opening

Take a look first IDEA in Debug Interface in mode .　
　　 Here's how IDEA Start in Debug Pattern , Enter the interface after the breakpoint , I am here Windows, May and Mac The icons of . Let's simply say that 8 A place to ：

① With Debug Mode start service , A button on the left Run mode . In development , I usually start it directly Debug Pattern , Easy to debug code at any time .

② The breakpoint ： Left click in the left line number bar , Or shortcut key Ctrl+F8 In the play / Cancel breakpoint , The color of breakpoint line can be set by yourself .

③ Debug window ： After the access request reaches the first breakpoint , Will be activated automatically Debug window . If not activated automatically , You can set it in the settings , Pictured 1.2.

④ Debug button ： Altogether 8 Button , The main functions of debugging correspond to these buttons , Hover over the button to view the corresponding shortcut key . In the menu bar Run You can find the same function in , Pictured 1.4.

⑤ Service button ： Can be closed here / Start the service , Set breakpoints, etc .

⑥ Method invocation stack ： This shows all the methods that this thread debugs , Check the [Show All Frames] Button , It will not show the methods of other class libraries , Otherwise, there will be a lot of ways .

⑦ Variables： In the variable area, you can view the variables in the current method before the current breakpoint .

⑧ Watches： Check the variable , Can be Variables Drag variables in area to Watches View in
　　
　　

Two 、 Basic usage & Shortcut key

Debug The function of debugging mainly corresponds to that in Figure 1 4 and 5 Two sets of buttons ：

1、 Let's start with the first set of buttons , common 8 Button , The sequence from left to right is as follows ：

> Show Execution Point (Alt + F10)： If your cursor is on another line or other page , Click this button to jump to the current line of code execution .

> Step Over (F8)： Step over , Go down line by line , If there is a method on this line, it will not enter the method .

> Step Into (F7)： Stepping into , If the current line has a method , Access to method interior , Generally used to enter the custom method , Methods that will not enter the official class library , As the first 25 Yes put Method .

> Force Step Into (Alt + Shift + F7)： Forced entry , Access to any method , You can use this method to enter the official class library when viewing the underlying source code .

> Step Out (Shift + F8)： Step out , Exit from the stepped in method to the method call , At this time, the method has been executed , It's just that the assignment hasn't been completed .

> Drop Frame ( The default is no )： Fallback breakpoint , Detailed description in later chapters .

> Run to Cursor (Alt + F9)： Run to the cursor , You can position the cursor on the line you want to see , Then use this function , The code runs to the cursor line , Without breaking points .

> Evaluate Expression (Alt + F8)： Calculation expression , Detailed description in later chapters .

2、 Second set of buttons , common 7 Button , From top to bottom as follows ：

> Rerun ‘xxxx’： Rerun program , Will shut down the service and restart the program .

> Update ‘tech’ application (Ctrl + F5)： To update the program , Generally, you can perform this function after your code has been changed . The corresponding operation of this function is in the service configuration , Pictured 2.3.

> Resume Program (F9)： Recovery procedure , such as , You are in the 20 Row sum 25 Line has two breakpoints , Currently running to 20 That's ok , Press F9, Run to the next breakpoint ( That is to say 25 That's ok ), Press again F9, Then run the whole process , Because there are no breakpoints .

> Pause Program： Suspend program , Enable Debug. No specific usage found at present .

> Stop ‘xxx’ (Ctrl + F2)： Press twice in a row , Shut down the program . Sometimes you will find that when the service is shut down and restarted , Message port occupied , This is because the service is not completely shut down , You need to kill everything JVM Process .

> View Breakpoints (Ctrl + Shift + F8)： View all breakpoints , Later chapters will cover .

> Mute Breakpoints： Dumb breakpoint , After choosing this , All breakpoints gray , Breakpoint failure , Press F9 You can run the program directly . Click again on the , Breakpoint turns red , It works . If you want to disable only one breakpoint , You can right-click on the breakpoint to cancel Enabled, Pictured 2.4, Then the line breakpoint is invalid .