this program is throwing an error, can you help fix cannot find symbol final int

Question

this program is throwing an error, can you help fix

cannot find symbol
final int ldu = Util.ldu( capacity ) + 1;
^
symbol: variable Util
location: class RealSum
1 error

public class RealSum
{protected boolean[] flags;
protected double[] sums;
public RealSum()
{
flags = new boolean[ 1 ];
sums = new double[ 1 ];
}
public RealSum( final int capacity ){
final int ldu = Util.ldu( capacity ) + 1;
flags = new boolean[ ldu ];
sums = new double[ ldu ];
}
final public double getSum()
{
double sum = 0;
for ( final double s : sums )
sum += s;
return sum;
}
final protected void expand( final double s )
   {
final double[] oldSums = sums;
sums = new double[ oldSums.length + 1 ];
System.arraycopy( oldSums, 0, sums, 0, oldSums.length );
sums[ oldSums.length ] = s;
final boolean[] oldFlags = flags;
flags = new boolean[ sums.length ];
System.arraycopy( oldFlags, 0, flags, 0, oldFlags.length );
flags[ oldSums.length ] = true;
}
final public void add( final double a )
{
int i = 0;
double s = a;
try{
while ( flags[ i ] )
   {
flags[ i ] = false;
s += sums[ i ];
sums[ i ] = 0.0;
++i;
}
flags[ i ] = true;
sums[ i ] = s;
return;
}
catch ( final IndexOutOfBoundsException e )
{
expand( s );
}
}
}

Explanation / Answer

Pl. make this correction in your program:
final int ldu = capacity + 1;

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