| Methods Summary |
|---|
| public static void | main(java.lang.String[] args)
//Allow an argument to set the size of the loop.
if (args.length != 0)
SIZE = Integer.parseInt(args[0]);
//Run the two tests twice each to ensure there were no initialization effects,
//reversing the order on the second run to make sure one test does not affect the other.
no_exception1(); with_exception1(); with_exception1(); no_exception1();
//Execute the array assignment tests only if there is no second argument
//to allow for large SIZE values on the first test which would give
//out of memory errors in the second test.
if (args.length > 1)
return;
no_exception2(); with_exception2(); with_exception2(); no_exception2();
no_exception3(); with_exception3(); with_exception3(); no_exception3();
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| public static void | no_exception1()
//Standard loop.
int result;
long time = System.currentTimeMillis();
for (int i = SIZE; i > 0 ; i--)
result = SIZE/i;
System.out.println("Division loop with no exceptions took " +
(System.currentTimeMillis()-time) + " milliseconds");
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| public static void | no_exception2()
//Create the array, get the time, and run the standard loop.
int array[] = new int[SIZE];
long time = System.currentTimeMillis();
for (int i = 0; i < SIZE ; i++)
array[i] = 3;
System.out.println("Assignment loop with no exceptions took " +
(System.currentTimeMillis()-time) + " milliseconds");
//Garbage collect so that we don't run out of memory for the next test.
//Set the array variable to null to allow the array instance to be garbage collected.
array = null;
System.gc();
try{Thread.sleep(2000);}catch(InterruptedException e){}
System.gc();
|
| public static void | no_exception3()
//Create the Vector, get the time, and run the standard loop.
java.util.Vector vector = new java.util.Vector(SIZE);
vector.setSize(SIZE);
java.util.Enumeration enum = vector.elements();
Object nothing;
long time = System.currentTimeMillis();
for ( ; enum.hasMoreElements(); )
nothing = enum.nextElement();
System.out.println("Enumeration loop with no exceptions took " +
(System.currentTimeMillis()-time) + " milliseconds");
//Garbage collect so that we don't run out of memory for the next test.
//Need to set the variables to null to allow the instances to be garbage collectable.
enum = null;
vector = null;
System.gc();
try{Thread.sleep(2000);}catch(InterruptedException e){}
System.gc();
|
| public static void | with_exception1()
//Non-standard loop with no test for termination using the
//ArithmeticException thrown at division by zero to terminate the loop.
int result;
long time = System.currentTimeMillis();
try
{
for (int i = SIZE; ; i--)
result = SIZE/i;
}
catch (ArithmeticException e) {}
System.out.println("Division loop with an exception took " +
(System.currentTimeMillis()-time) + " milliseconds");
|
| public static void | with_exception2()
//Create the array, get the time, and run a non-standard loop with no test for termination
//using the ArrayIndexOutOfBoundsException to terminate the loop.
int array[] = new int[SIZE];
long time = System.currentTimeMillis();
try
{
for (int i = 0; ; i++)
array[i] = 3;
}
catch (ArrayIndexOutOfBoundsException e) {}
System.out.println("Assignment loop with an exception took " +
(System.currentTimeMillis()-time) + " milliseconds");
//Garbage collect so that we don't run out of memory for the next test.
//Set the array variable to null to allow the array instance to be garbage collected.
array = null;
System.gc();
try{Thread.sleep(2000);}catch(InterruptedException e){}
System.gc();
|
| public static void | with_exception3()
//Create the Vector, get the time, and run a non-standard loop with no termination test
//using the java.util.NoSuchElementException to terminate the loop.
java.util.Vector vector = new java.util.Vector(SIZE);
vector.setSize(SIZE);
java.util.Enumeration enum = vector.elements();
Object nothing;
long time = System.currentTimeMillis();
try
{
for ( ; ; )
nothing = enum.nextElement();
}
catch (java.util.NoSuchElementException e) {}
System.out.println("Enumeration loop with an exception took " +
(System.currentTimeMillis()-time) + " milliseconds");
//Garbage collect so that we don't run out of memory for the next test.
//Need to set the variables to null to allow the instances to be garbage collectable.
enum = null;
vector = null;
System.gc();
try{Thread.sleep(2000);}catch(InterruptedException e){}
System.gc();
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