TestFormat

1
TestFormat

• import java.text.
• import java.util.
• public class TestFormat
• public static void main(String args)
• Terminal output new Terminal()
• double number 1120.0, 111225.500,
  50000.67
• DecimalFormat deci new
  DecimalFormat(",,.")
• for(int x 0 x lt number.length x)
• output.println(deci.format(numberx))
  

2
output

• 1,120
• 111,225.5
• 50,000.67

3
double number 1120, 111225.500, 50000.67,
1000000076.989

• 1,120
• 111,225.5
• 50,000.67
• 1,000,000,076.99

4
,,.

• The number can have at most 2 digits after the
  decimal point
• The NumberFormat doesnt just drop the extra
  digits but rounds up
• ,. would have worked the same
• . would not have the ,

5
For those in France

• import java.text.
• import java.util.
• public class TestFormat
• public static void main(String args)
• Terminal output new Terminal()
• double number 1120, 111225.500,
  50000.67, 1000000076.989
• DecimalFormat deci new
  DecimalFormat(",.")
• for(int x 0 x lt number.length x)
• deci (DecimalFormat)deci.getInstance
  (Locale.FRANCE)
• output.println(deci.format(numberx))
  

6
output

• 1?120
• 111?225,5
• 50?000,67
• 1?000?000?076,989
• Notice it didnt round up like before

7
AlignIntegers from the web

• public class AlignIntegers
• static String align(NumberFormat fmt, int n,
  int sp)
• StringBuffer buf new StringBuffer()
• FieldPosition fpos new
  FieldPosition(NumberFormat.INTEGER_FIELD)
• fmt.format(n, buf, fpos)
• for (int i 0 i lt sp -
  fpos.getEndIndex() i)
• buf.insert(0, ' ')
• return buf.toString()
• public static void main(String args)
• NumberFormat fmt NumberFormat.getInstanc
  e()
• System.out.println(align(fmt, 10, 9))
• System.out.println(align(fmt, 100, 9))
• System.out.println(align(fmt, 1000, 9))

8
output

• 10
• 100
• 1,000
• 10,000