java - ArrayIndexOutOfBoundException when run my simple code -

i write simple code understanding passing value manually, there code

public class coba{     public static void main (string[] args){         int a;         int b;         a= integer.parseint(args [0]);         b= integer.parseint(args [1]);          int c=0;         c= a+b;         system.out.println("jumlah "+c);     } } 

why arrayindexoutofboundexception?? , how solve can pass values of , b manually? answer :)

well presumably you're not passing in 2 command-line arguments. should fine if run with:

java coba 10 20 

for example.

you can validate @ start using args.length:

public static void main (string[] args){     if (args.length < 2) {         system.out.println("i need 2 command line arguments!");         return;     }     int = integer.parseint(args[0]);     int b = integer.parseint(args[1]);     int c = + b;     system.out.println("jumlah "+c); }