Complete this example and say the handling mechanism for exceptions in Java.

There is a class of ClassA, there is a class of CLASSB, there is a method B in ClassB, this method throws an exception, in the ClassA class there is a method A, call B in this method, and then throw an exception. In a client that has a class of TESTC, there is a method for C, please catch the exception information in this method. To complete this example, describe the handling mechanism for exceptions in Java.

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2. Package Com.itheima;
6. Import java.io.IOException;
10. /**
12. * Question 6th: There is a class ClassA, there is a class of CLASSB, in ClassB there is a method B,
14. * This method throws an exception, there is a method a in the ClassA class, call B in this method, and throw an exception.
16. * In the client there is a class of TESTC, there is a method for C, please catch the exception information in this method.
18. * To complete This example, please describe the handling mechanism for exceptions in Java.
20. *
22. Exceptions in *java are divided into "Runtime exceptions" and "compile-time exceptions"
24. * Run-time exception: is the program in the process of running the exception generated, this is not necessary to deal with, we need to fix
26. * Compile-time exception: is the program in the process of compiling the exception generated, this we have to deal with
28. * In Java programs, there are two kinds of exception handling mechanism, one is "throw exception", one is "catch exception", one is "default out"
30. * Default processing, he will put the exception name, reason, location and other information output in the console, but the program will not continue to execute the
32. * Throw exception: Use the keyword throws throw
34. * Throws is used to throw an exception when declaring a method, only an exception
36. * Throw is used to throw an actual exception, throw a specific exception object, can be more than one exception.
38. * Catch Exception: try....catch...finally
40. * try{code block}
42. * The code block that is contained in the middle is the code that may appear to be abnormal.
44. * catch{code block}
46. * This code block is the code to handle the exception
48. * finally{code block}
50. * This is a block of code that needs to be executed after exception handling. This block of code is always executed to release resources.
52. * Note: Try cannot be used alone, it must be used with one of the catch or finally two
54. */
56. Public class Test6 {
58. Public static void Main (string[] args) throws Exception {
60. Create TC Object
62. TESTC TC = new TESTC ();
64. Use TC to invoke the C method and run this class
66. TC.C ();
68. A = new A ();
70. A.A ();
72. }
74. }
78. Class A
80. Class a{
82. Create a method, create a B object in the A method, call the B method through the B object, because the B object throws an exception, and you also throw an exception in the A method
84. public Void A () throws exception{
86. b b = new B ();
88. B.B ();
90. }
92. }
96. Class B
98. Class B {
100. Create a B method and throw an exception
102. public void B () throws exception{
104. System.out.println ("I am a B method in class B, I throw an exception!")  ");
106. }
108. }
110. Client class
112. Class testc{
114. public void C () {
116. Create a object of a
118. A = new A ();
120. Call the A method in the A object, at this point because an exception is thrown in the A method, so this must be handled, using Try...catch processing
122. try {
124. A.A ();
126. } catch (Exception e) {
128. //TODO auto-generated catch block
130. System.out.println ("I am the catch exception method," +e.tostring ());
132. }
134. }
136. }

Complete this example and say the handling mechanism for exceptions in Java.