How to use java.String.format?

Source:

import java.util.Date;

public class FormatString {
   public static void main(String[] args) {

      String name = "Tom";
      int age = 100;
      Date date = new Date();
      float f = 1.2f;

      String s1 = String.format("Hello %s", name);
      System.out.println(s1);

      String s2 = String.format("The age %d is old", age);
      System.out.println(s2);

      String s3 = String.format("%s is %d years old", name, age);
      System.out.println(s3);

      System.out.printf("%.3f %n", f);

      String day = String.format("Today is %tD", date);
      System.out.println(day);
   }
}

Output:

   $ java FormatString 
   Hello Tom
   The age 100 is old
   Tom is 100 years old
   1.200 
   Today is 01/26/14