ADDITIONAL SYSTEM INFORMATION :
Java 1.7/1.8 Windows

A DESCRIPTION OF THE PROBLEM :
Please see the code below:

import java.text.SimpleDateFormat;
import java.text.DateFormat;
class Date1{

            public static void main(String[]args){
                        
                        DateFormat format = new SimpleDateFormat("dd-MMM-YYYY");
                        System.out.println("Date is "+ format.format(new java.util.Date("12/31/2020")));
            }
}
The result is showing as Date is 31-DEC-2021 but actually the date should be 31-DEC-2020 because that is the requirement.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute above code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Date is 31-DEC-2020
ACTUAL -
Date is 31-DEC-2021