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CHAPTER 9 Exception Handling
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The first line is the string message that describes the exception The second line is the stack trace The stack trace is saying that the exception occurred at line 4 in the main() method of the demojava program If you look at line 4 of the previous example, you ll notice that it s the line that contains the calculation This is where the program terminated once the exception is thrown If the exception is caused by a statement within a method called from the main() method, the stack trace includes both methods, showing you the path toward the statement that caused the exception You can see this in the next example, where the calculation that causes the divide by zero error is placed in a method called by a statement within the main() method:
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class Demo { public static void main (String args[]) { myMethod(); } static void myMethod() { int a = 10, b = 0, c; c = a/b; } }
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Here is the stack trace that is displayed when the previous example is executed:
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Exception in thread "main" javalangArithmeticException: / by zero at demomyMethod(demojava:7) at demomain(demojava:3)
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The first line is the message that describes the exception The second line begins the stack trace Beginning by reading the stack trace from the last line, here s what the stack trace is saying: First, the main() method of the demojava program is called Then, in line 3 of the program, myMethod() is called Line 7 of the program, which is within the myMethod() definition, is where the program terminated because of an exception
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Nested Try Statements
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Sometimes programmers combine two or more try blocks by placing one try block within another try block This is referred to as nesting a try block, where the inner try block is considered the nested try block (that is, nested within the outer try block) Collectively they are called a nested pair of try blocks Each try block in the nested pair should have one or more catch blocks or a finally block that catch exceptions thrown by Java The catch blocks are placed following the corresponding try block identically to the way single try blocks and catch blocks are written
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When a statement in an inner try block causes an exception to be thrown, the catch blocks associated with the inner try block are the first to be matched to the exception If none of those catch blocks catches the exception, the catch blocks associated with the outer try block are matched If the exception still isn t caught, the default handler catches the exception The following example illustrates how a nested try block works This example is similar to the previous example used to show you how to use two catch blocks in your program There is one error in this program We are trying to access array element a[3], which doesn t exist Therefore, the array index is out of bounds This example contains two try blocks The inner try block contains statements that cause the error The catch block associated with the inner try block catches only arithmetic exceptions This means that it does not catch the out of bounds exception The outer try block contains only the inner try block However, the catch block associated with the outer try block does catch arithmetic exceptions Therefore, it is this catch block that catches the arithmetic exception thrown by the inner try block It is important to understand that although the outer try block in this example does not contain any statements other than the inner try block, you can include statements within the outer try block
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class Demo { public static void main (String args[]) { try { try { int a[] = new int[3]; a[0] = 10; a[1] = 0; a[2] = a[0]/a[3]; } catch (ArithmeticException e) { Systemoutprintln("Error: " + e); } } catch (ArrayIndexOutOfBoundsException e) { Systemoutprintln("Error: " + e); } } }
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