I need java coding on this

1. WAP through which we can get the system user name? 2. WAP through which we can get the second value of any excel row. 3. WAP through which we can store multiple values in one variable 4. WAP through which we can get the Tenth value of 10th row and 10th column. 5. WAP and convert the below variable values as integer data type which currently as variable data type. String My Value = "123456"; 6. Convert the Date 16 June 2020 to 10.15.2020 format. 7. Create an array and print 10 colors in the print area by using the for loop