tryblocktest.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

import java.io.IOException;

public class TryBlockTest
{
  public static void main(String[] args) throws IOException
  {
    int[] x = {10, 5, 0};               // Array of three integers

    // This block only throws an exception if method divide() does
    try 
    {
      System.out.println("First try block in main() entered");
      System.out.println("result = " + divide(x,0));  // No error
      x[1] = 0;                         // Will cause a divide by zero
      System.out.println("result = " + divide(x,0));  // Arithmetic error
      x[1] = 1;                         // Reset to prevent divide by zero
      System.out.println("result = " + divide(x,1));  // Index error
    }
    catch(ArithmeticException e) 
    {
      System.out.println("Arithmetic exception caught in main()");
    }
    catch(ArrayIndexOutOfBoundsException e) 
    {
      System.out.println(
                "Index-out-of-bounds exception caught in main()");
    }

    System.out.println("Outside first try block in main()");
    System.out.println("\nPress Enter to exit");

    // This try block is just to pause the program before returning
    try 
    {
      System.out.println("In second try block in main()");
      System.in.read();                 // Pauses waiting for input...
      return;
    }
    catch(IOException e)                // The read() method can throw exceptions
    {
      System.out.println("I/O exception caught in main()");
    }
    finally                             // This will always be executed
    {
      System.out.println("finally block for second try block in main()");
    }

    System.out.println("Code after second try block in main()");
  }

  // Divide method
  public static int divide(int[] array, int index) 
  {
    try 
    {
      System.out.println("\nFirst try block in divide() entered");
      array[index + 2] = array[index]/array[index + 1];
      System.out.println("Code at end of first try block in divide()");
      return array[index + 2];
    }
    catch(ArithmeticException e) 
    {
      System.out.println("Arithmetic exception caught in divide()\n" +
                         "\nMessage in exception object:\n\t" + e.getMessage());
      System.out.println("\nStack trace output:\n");
      e.printStackTrace();
      System.out.println("\nEnd of stack trace output\n");
    }
    catch(ArrayIndexOutOfBoundsException e) 
    {
      System.out.println(
                    "Index-out-of-bounds exception caught in divide()\n" +
                    "\nMessage in exception object:\n\t" + e.getMessage());
    System.out.println("\nStack trace output:\n");
    e.printStackTrace();
    System.out.println("\nEnd of stack trace output\n");
    }
    finally
    {
      System.out.println("finally clause in divide()");
    }
    System.out.println("Executing code after try block in divide()");
    return array[index + 2];
  }
}