Calculate process time in Java
This section provides the facility to calculate the
process time of the completion of the operation through the Java program. In
this section, an example with the complete code of the program is given for the
best illustration of the procedure of calculating the process time in which any
type of operation is completed after whole processing.
Code Description:
System.currentTimeMillis():
This is the method of the System class, which returns the current time of your system in milliseconds. This has been used in the code of the program for the getting the process time by subtracting current time when the process is started and another time is the completion time of the operation or the process.
Here is the code of the program:
import java.util.*;
public class CalculateProcessTime{
public static void main(String[] args){
int repeat = 2000;
double[] ds = {Double.MAX_VALUE, -3.14e-200D, Double.NEGATIVE_INFINITY, 567.89023D,
123e199D, -0.000456D, -1.234D, 1e55D};
long[] ls = {2283911683699007717L, -8007630872066909262L, 4536503365853551745L,
548519563869L, 45L, Long.MAX_VALUE, 1L, -9999L, 7661314123L, 0L};
long time;
StringBuffer s = new StringBuffer();
Hashtable<Object,Object> h = new Hashtable<Object,Object>();
System.out.println("Starting test");
time = System.currentTimeMillis();
for(int i = repeat; i > 0; i--){
s.setLength(0);
for(int j = ds.length-1; j >= 0; j--){
s.append(ds[j]);
h.put(new Double(ds[j]), Boolean.TRUE);
}
for(int j = ls.length-1; j >= 0; j--){
s.append(ls[j]);
h.put(new Long(ls[j]), Boolean.FALSE);
}
}
time = System.currentTimeMillis() - time;
System.out.println(" The test took " + time + " milliseconds");
}
}
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