Number formatting with two digits after decimal point in Java -

i've written code compute levenshtein distance between 2 strings , give output in floating point format numbers after decimal point.

how can format output display 2 digits after decimal point? don't know how in java, know in c use .%2.f.

here code:

package algoritma.levenshteindistance;  public class levenshteindistance {  string hasilpersen;  public string gethasilpersen() {     return hasilpersen; }  public void sethasilpersen(string hasilpersen) {     this.hasilpersen = hasilpersen; }  public levenshteindistance() {  }  public double similarity(string s1, string s2) {     if (s1.length() < s2.length()) { // s1 should bigger         string swap = s1;         s1 = s2;         s2 = swap;     }     int biglen = s1.length();     if (biglen == 0) {         return 1.0; /* both strings 0 length */ }     return (biglen - computeeditdistance(s1, s2)) / (double) biglen; }  public  int computeeditdistance(string s1, string s2) {     s1 = s1.tolowercase();     s2 = s2.tolowercase();      int[] costs = new int[s2.length() + 1];     (int = 0; <= s1.length(); i++) {         int lastvalue = i;         (int j = 0; j <= s2.length(); j++) {             if (i == 0) {                 costs[j] = j;             } else {                 if (j > 0) {                     int newvalue = costs[j - 1];                     if (s1.charat(i - 1) != s2.charat(j - 1)) {                         newvalue = math.min(math.min(newvalue, lastvalue),                                 costs[j]) + 1;                     }                     costs[j - 1] = lastvalue;                     lastvalue = newvalue;                 }             }         }         if (i > 0) {             costs[s2.length()] = lastvalue;         }     }     return costs[s2.length()]; }  public string printdistance(string s1, string s2) {     system.out.println("[edit distance]       " + s1 + " , " + s2  + " " +similarity(s1, s2) * 100 + "%");     return  similarity(s1, s2) * 100 + " % "; }  public static void main(string[] args) {       levenshteindistance lv = new levenshteindistance();     lv.printdistance("841644761164234287878797", "841644487611642341");  } 

}

edit, mean return of method public double similarity or method printdistance . because, in class when create object class, need return format 0.00

you can use :

public class decimalplaces {      public static void main(string[] args) {          double d = 1.234567;         system.out.printf("%1$.2f", d);     }  } 

or

public void gettwodecimal(){          double d = 2.34568;         decimalformat f = new decimalformat("##.00");  // helps keeps in 2 decimal places         system.out.println(f.format(d));  }