1  import java.util.Scanner;

  2  

  3  /**

  4     This program demonstrates comparisons of numbers and strings.

  5  */

  6  public class Compare

  7  {

  8     public static void main(String[] args)

  9     {  

 10        // Integers 

 11  

 12        int m = 2;

 13        int n = 4;

 14  

 15        if (m * m == n)

 16        {

 17           System.out.println("2 times 2 is four.");

 18        }

 19  

 20        // Floating-point numbers

 21        

 22        double x = Math.sqrt(2);

 23        double y = 2.0;

 24  

 25        if (x * x == y)

 26        {

 27           System.out.println("sqrt(2) times sqrt(2) is 2");

 28        }

 29        else

 30        {

 31           System.out.printf("sqrt(2) times sqrt(2) is not four but %.18f\n", x * x);

 32        }

 33  

 34        final double EPSILON = 1E-14;

 35        if (Math.abs(x * x - y) < EPSILON)

 36        {

 37           System.out.println("sqrt(2) times sqrt(2) is approximately 2");

 38        }

 39  

 40        // Strings

 41  

 42        String s = "120";

 43        String t = "20";

 44  

 45        int result = s.compareTo(t);

 46  

 47        String comparison;

 48        if (result < 0) 

 49        {

 50           comparison = "comes before";

 51        }

 52        else if (result > 0)

 53        {

 54           comparison = "comes after";

 55        }

 56        else

 57        {

 58           comparison = "is the same as";

 59        }

 60  

 61        System.out.printf("The string \"%s\" %s the string \"%s\"\n", s, comparison, t);

 62  

 63        String u = "1" + t;

 64        

 65        System.out.printf("The strings \"%s\" and \"%s\" are ", s, u);

 66        if (s != u) { System.out.print("not "); }

 67        System.out.print("identical. They are "); 

 68        if (!s.equals(u)) { System.out.print("not "); }

 69        System.out.println("equal."); 

 70     }

 71  }

 72  

 73