Exceptions - Beginning Java 2 SDK - page 297

Try block entered i = 1 j = 1
1
Ending try block
After try block
From this you can see that the entire try block is executed. Execution then continues with the
statement after the catch block. Because no arithmetic exception was thrown, the code in the catch
block isn't executed.
You need to take care when adding try blocks to existing code. A try block is no
different to any other block between braces when it comes to variable scope. Variables
declared in a try block are only available until the closing brace for the block. It's
easy to enclose the declaration of a variable in a try block, and, in doing so,
inadvertently limit the scope of the variable and cause compiler errors.
The catch block itself is a separate scope from the try block. If you want the catch block to output
information about objects or values that are set in the try block, make sure the variables are declared
in an outer scope.
try catch Bonding
The try and catch blocks are bonded together. You must not separate them by putting statements
between the two blocks, or even by putting braces around the try keyword and the try block itself. If
you have a loop block that is also a try block, the catch block that follows is also part of the loop. We
can see this with a variation of the previous example.
Try It Out - A Loop Block That is a try Block
We can make j a loop control variable and count down so that eventually we get a zero divisor in the loop:
public class TestLoopTryCatch {
public static void main(String[] args) {
int i = 12;
for(int j=3 ;j>=-1 ; j--) {
try {
System.out.println("Try block entered " + "i = "+ i + " j = "+j);
System.out.println(i/j); // Divide by 0 - exception thrown
System.out.println("Ending try block");
} catch(ArithmeticException e) { // Catch the exception
System.out.println("Arithmetic exception caught");
}
}
System.out.println("After try block");
return;
}
}