Updating rows who has same id with different values for each row from java program

Here is my requirement,

   Following is a table which contains 5 rows with same id.

student table:

 sid   sname  age

  2     aruna  25
  2     balu   30
  2     srinu  40
  2     murali 30
  3     lavanya 35
  1     ashok   27
  1     suresh  24
  1     surya   25
  1     arya    28
  1     sravan  30

Folllowing is my requirement:

If multiple rows have same sid then only we have to update those records.(In this example 4 records are there with sid 2 value and 5 records with sid 1 value.we have to change only those records.) I have to update the records which contains sid 1. But i have to update first row (having sid 1) with "naveen" as value for sname column.And second row(having sid 1) with "varun" as a value for sname column and so on 5th row (having sid 1) with "lalitha" as a value for sname column from java program. Same for records with sid 2 value.