Technically you can't resize the length of an array after you've declared it.

There are a few clever ways around it.

The first way is to use Vectors. This is not recommended because they use more memory, and are a little too heavy for most of what you need as far as sizable arrays go.

The second way is the way I usually do it.

Say you have an array of floats:

float ball[20];

When you call ball (by itself) it is simply a reference to the array.

Thus you can do something like...

//create a temporary array with one size larger
float temp[ball.length+1];

//copy contents into this new array
for(int i=0;i<ball.length;i++)
{
 temp[i]=ball[i];
}

//add a value to the last element in the array
temp[ball.length]=newValue;

//point the ball reference to this new array of one size larger
ball=temp;


Now ball is an array that is one size larger than previously.


A faster way to do this:

float temp[ball.length+1];
System.arraycopy(ball,0,temp,0,ball.length);
temp[ball.length]=newValue;
ball=temp;

This is a shortcut using a built-in java function to dump the contents of an array into another. It also runs faster I believe.