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Your main() method can take input parameters of type String if your program is run through a console like

java YourClass arg1 arg2 

Now, within main if you iterate the String [] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Demo :

public class AddTwoNumbers { public static void main(String[] args) { try { int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[1]); System.out.println("a + b = " + a + " + " + b + " = "+ (a + b)); } catch (NumberFormatException e) { System.err.println("Invalid Input: Please enter numbers."); } } } 

You can run this through console as

java AddTwoNumbers 2 3 

and it should print

a + b = 2 + 3 = 5 

Your main() method can take input parameters of type String if your program is run through a console like

java YourClass arg1 arg2 

Now, within main() if you iterate the String [] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Demo :

public class AddTwoNumbers { public static void main(String[] args) {   if(args.length == 2) {  try { int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[1]); System.out.println("a + b = " + a + " + " + b + " = "+ (a + b)); } catch (NumberFormatException e) { System.err.println("Invalid Input: Please enter numbers."); }   } else {  System.err.println("Missing Input: Please enter TWO numbers."); } } } 

You can run this on your console as

java AddTwoNumbers 2 3 

and it should print

a + b = 2 + 3 = 5 

Your main() method can take input parameters of type String if your program is run through a console like

java YourClass arg1 arg2 

Now, within main if you iterate the String [] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Demo :

public class AddTwoNumbers { public static void main(String[] args) { try { int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[0]); System.out.println("a + b = " + a + " + " + b + " = "+ (a + b)); } catch (NumberFormatException e) { System.err.println("Invalid Input: Please enter numbers."); } } } 

You can run this through console as

java AddTwoNumbers 2 3 

and it should print

a + b = 2 + 3 = 5 

Your main() method can take input parameters of type String if your program is run through a console like

java YourClass arg1 arg2 

Now, within main if you iterate the String [] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Demo :

public class AddTwoNumbers { public static void main(String[] args) { try { int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[1]); System.out.println("a + b = " + a + " + " + b + " = "+ (a + b)); } catch (NumberFormatException e) { System.err.println("Invalid Input: Please enter numbers."); } } } 

You can run this through console as

java AddTwoNumbers 2 3 

and it should print

a + b = 2 + 3 = 5 

Your main() method can take input parameters of type String if your program is run through a console like

java yourClass arg1 arg2 

Now, within main if you iterate the String[] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Your main() method can take input parameters of type String if your program is run through a console like

java YourClass arg1 arg2 

Now, within main if you iterate the String [] like

for (arg : arguments) System.out.println(arg); 

it should print

arg1 arg2 

Demo :

public class AddTwoNumbers { public static void main(String[] args) { try { int a = Integer.parseInt(args[0]); int b = Integer.parseInt(args[0]); System.out.println("a + b = " + a + " + " + b + " = "+ (a + b)); } catch (NumberFormatException e) { System.err.println("Invalid Input: Please enter numbers."); } } } 

You can run this through console as

java AddTwoNumbers 2 3 

and it should print

a + b = 2 + 3 = 5