how to round number up to 3 decimal places java code example

Example 1: decimal up to 6 places in java

double num = 1.34567;
System.out.format("%.4f", num);

Example 2: round off java 2 decimal places

class round{
    public static void main(String args[]){

    double a = 123.13698;
    double roundOff = Math.round(a*100)/100;

    System.out.println(roundOff);
}
}