输出格式对齐问题
下面我写的这个代码在输出的时候数字由于小数的浮动很难对齐希望给予帮助..

import   javax.swing.JOptionPane;
public   class   Two   {

public   static   void   main(String   arg[]){
//prompt   the   user   to   enter   the   information
String   loanString   =   JOptionPane.showInputDialog(null,
"Please   enter   loan   amount   \nFor   example   10000.2: ", "Input ",JOptionPane.QUESTION_MESSAGE);//get   the   loan   amount

int   loan   =   Integer.parseInt(loanString);//   change   the   loan   form   string   to   int

String   yearString   =   JOptionPane.showInputDialog(null,
"Please   enter   the   number   of   years   as   an   integer   \nFor   example   2: ", "Input ",JOptionPane.QUESTION_MESSAGE);//get   the   year

int   year   =   Integer.parseInt(yearString);//   change   the   year   form   string   to   int

String   rateString   =   JOptionPane.showInputDialog(null,
"Please   enter   the   yearly   rate   \nFor   example   3.4 ", "Input ",JOptionPane.QUESTION_MESSAGE);//get   the   yearly   rate

double   rate   =   Double.parseDouble(rateString);//   change   the   rate   form   string   to   double

//calcuate   monthlyrate,monthlypayment
double   monthlyrate   =   (rate/1200);

double   monthlypayment   =   (loan*monthlyrate   /   (1-(1/Math.pow((1+monthlyrate),   year*12))));

double   totalpayment   =   monthlypayment*year*12;

//declare   variables
double   principal   =   monthlypayment;
double   interest   =0;
double   balance   =   loan;

//format   to   keep   two   digits   after   the   decimal   point
monthlypayment   =   (int)(monthlypayment*100)   /   100.0;
totalpayment   =   Math.round(totalpayment*100)   /   100.0;

String   outputnumber=   " ";

String   output= "Loan   Amount:   "+loan+ "\nNumber   of   Year:   "+year+ "\nAnnual   interest   rate:   "
+(int)rate+ "% "+ "\nMonthly   Payment:   "+monthlypayment+ "\nTotal   Payment:   "+totalpayment
+ "\nPayment# "+ "           "+ "interest "+ "           "+ "Principal "+ "           "+ "Balance ";

/*calculate   the   interest,principal   and   balance
and   put   them   into   output*/
for   (int   i=1;   i <=year;i++){
for(int   j=1;j <=12;j++){

interest   =   balance   *   monthlyrate;
interest   =   (int)(interest*100)   /   100.0;
principal   =   monthlypayment   -   interest;
balance   =   balance   -   principal;
principal   =   (int)(principal*100)   /   100.0;
balance   =   (int)(balance*100)   /   100.0;