You can round a double using the setScale() method of BigDecimal class. This method is vlaid after Java 1.1. An example of doing this is shown below:
import java.math.*;
public class divers {
public static void main(String args[]){
divers d = new divers();
d.testRound();
}
public void testRound(){
double r = 3.1537;
int decimalPlace = 2;
BigDecimal bd = new BigDecimal(r);
bd = bd.setScale(decimalPlace,BigDecimal.ROUND_UP);
r = bd.doubleValue();
System.out.println(r); // output is 3.15
}
}
another way:
double dbl = 12.3456;
int ix = (int)(dbl * 100.0); // scale it
double dbl2 = ((double)ix)/100.0;
System.out.println("dbl=" + dbl + ", dbl2=" + dbl2); //dbl=12.3456, dbl2=12.34
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