Java - toString Formatting (Formatting Doubles) -

the project working on requires bank account balance printed using tostring method. not allowed add methods current program, need format mybalance variable double goes 2 decimal places instead of one. in particular instance program should printing 8.03, printing 8.0.

here tostring method:

   public string tostring()    {       return"savingsaccount[owner: " + myname +        ", balance: " + mybalance +        ", interest rate: " + myinterestrate +        ",\n number of withdrawals month: " + mymonthlywithdrawcount +        ", service charges month: " +        mymonthlyservicecharges + ", mystatusisactive: " +       mystatusisactive + "]";    } 

i new java still, know if there way implement %.2f string somewhere format mybalance variable. thank you!

use string.format(...) this:

@override public string tostring() {     return "savingsaccount[owner: " + myname +      ", balance: " + string.format("%.2f", mybalance) +      ", interest rate: " + string.format("%.2f", myinterestrate) +      ",\n number of withdrawals month: " + mymonthlywithdrawcount +      ", service charges month: " +      mymonthlyservicecharges + ", mystatusisactive: " +     mystatusisactive + "]"; } 

or more succinctly:

@override public string tostring() {     string result = string.format("[owner: %s, balance: %.2f, interest rate: %.2f%n" +         "number of withdrawals month: %d, service charges month: %.2f, " +          "mystatusisactive: %s]",         myname, mybalance, myinterestrate, mymonthlywithdrawcount,          mymonthlyservicecharges, mystatusisactive);     return result; } 

note khelwood asked use of "%n" new-line token rather usual "\n" string. use %n because allow java.util.formatter platform specific new-line, useful in particular if want write string file. note string.format(...) system.out.printf(...) , similar methods use java.util.formatter in background applies them well.