Command Line Arguments

Command Line Arguments
  • The arguments which are passing from command prompt are called command line arguments.Β 
  • The main object of command line arguments are we can customize the behavior of main.
java Test a b c
Here a = arg[0];
b = arg[1];
c = arg[2];
args.length = 3;
package com.ashok.test;

public class Test {
   public static void main(String args[]) {
      for(int i = 0; i < args.length; i++) {
         System.out.print(args[i]);
      }
   }
}

O/P
java Test // Nothing Display
java Test A B // A B
  • Within the main() command line arguments are available in string form.
package com.ashok.test;

public class Test {
   public static void main(String args[]) {
      System.out.print(args[0]+args[1]]);
   }
}
O/P
java Test 10 20 // 1020
  • Space is the separator between command line arguments, if the command line arguments itself contain space then we should enclose with in double quotes.
package com.ashok.test;

public class Test {
   public static void main(String args[]) {
      System.out.print(args[0]);
   }
}
O/P
java Test "Ashok Kumar" // Ashok Kumar 
package com.ashok.test;

public class Test {
   public static void main(String args[]) {
      String argh = {'A','B'};
      args = argh;
      for(String s : args) {
         System.out.println(s);
      }
   }
}
java Test X Y
O/P A B

java Test X Y Z
O/P A B

java Test
O/P A B

Note

The maximum allowed number of command line arguments is 2147483647 which is maximum size of integer data type and minimum is 0

Command Line Arguments


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