What does "String[] args" contain in java? -

when run following program:

public class test {     public static void main(string[] args)     {         system.out.println(args);     } { 

it prints: [ljava.lang.string;@153c375

and when run again, prints: [ljava.lang.string;@1d1e730

it gives me different output each time

so, "[ljava.lang.string;@153c375" mean?

update: realized never answered question "what “string[] args” contain in java?" :-) it's array of command-line arguments provided program, each argument being string in array.

and resume our regularly-scheduled answer...

args array. see individual command-line arguments, index array — args[0], args[1], etc.:

you can loop through args this:

public class test {     public static void main(string[] args)     {         int index;          (index = 0; index < args.length; ++index)         {             system.out.println("args[" + index + "]: " + args[index]);         }     } } 

for java test 1 2 three, output:

args[0]: 1 args[1]: 2 args[2]: three

or loop if don't need index:

public class test {     public static void main(string[] args)     {         (string s : args)         {             system.out.println(s);         }     } } 

so, "[ljava.lang.string;@153c375" mean?

that's java's default tostring return value string[] (an array of string). see object#tostring. [ means "array", l means "class or interface", , java.lang.string self-explanatory. part comes class#getname(). ;@153c375 ;@ followed hashcode of array hex string. (i think default implementation of hashcode object indicates in memory array located, why it's different different invocations of program, that's unspecified behavior , wouldn't use anyway.)