In Java write a program that processes command line argument

In Java, write a program that processes command line arguments. The arguments are a mixture of numbers (ints and doubles). Run the program three times with a) b) c) as command-line arguments. Print each number on a separate line and whether it is an int or a double.

Test your program with each of the following lists of arguments:

a) 1 2 3 4 5

b) 1.1 2.2 3.3 4.4

c) 1 2.9 3 4.9 5 6.9

Solution

CommandLineTest.java

import java.util.regex.Pattern;

public class CommandLineTest {

   public static void main(String[] args) {
       String decimalPattern = \"([0-9]*)\\\\.([0-9]*)\";
       String integerPattern = \"[0-9]\";
      
       for(int i=0; i<args.length; i++){
           boolean doubleMatch = Pattern.matches(decimalPattern, args[i]);
           boolean intMatch = Pattern.matches(integerPattern, args[i]);
           System.out.print(args[i]+\" \");
           if(intMatch){
               System.out.print(\"Integer\");
           }
           else if(doubleMatch){
               System.out.print(\"Double\");
           }
           System.out.println();
       }

   }

}

Output:

1 Integer
2.9 Double
3 Integer
4.9 Double
5 Integer
6.9 Double

1.1 Double
2.2 Double
3.3 Double
4.4 Double

1 Integer
2 Integer
3 Integer
4 Integer
5 Integer