This is the beginning class for Java so please use basic codes

One acre of land is equivalent to 43,560 square feet. Write a program
that calculates the number of square feet in a tract of land with 3.5
acres.  Hint: Multiply the size of the tract of land (in acres) 
by the number of square feet in an acre to get the number
 of square feet in the tract.

a) You must have a variable called nrAcres where you will store the 
number of acres in the track.

b) Output must look as follows:

Size of land in acres: 3.5
Size of land in square feet: 152460

c) if the value of the variable nrAcres is changed the
 output should change accordingly. 
 In other words: it would be wrong to have the
following statement:

System.out.println("Size of land in square feet: 152460");

previous statement will print the correct output but will not change
 if you change the value of nrAcres.