Java encode and decode program cant pass key word through args

Question

So, I'm not sure what is happening here, if I place encode or decode in the args[0], it should work right, but it doesn't. I have all the imports and I have a utility class that I'm using as well. I don't understand why, when I run the program with these arguments: java Prog4 encode fly message.txt it won't work right. It'll go straight to the last else statement.

    public class Prog4 {
        public static void main(String[] args){
            if (args.length != 3){
                    System.out.println("Enter the right amount of arguments!");
                    System.exit(0);
            }

            String command=args[0];
            String key= args[1];
            String fileName = args[2];
            File file = new File(args[2]);
            String fileExtention="";
            if(args[0]=="encode"){
                    fileExtention=".crypt";

            }
            else if (args[0]=="decode"){
                    fileExtention=".decrypt";
            }
            else{
                    System.out.println("Enter decode or encode!");
                    System.exit(0);
            }

You need to use the equals() method to compare strings in Java. — yole, Mar 07 '15 at 19:59

score 0 · Accepted Answer · answered Mar 07 '15 at 20:00

0

try this:

args[0].equals("encode")

and this:

args[0].equals("decode")

to compare the strings in java...

you use == to check if the references are equal.

you should use .equals() to check if the values are equal.

answered Mar 07 '15 at 20:00

adrCoder

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This worked! I'm so happy now thank you! – Sergio Valencia Mar 07 '15 at 20:03
glad it works. please accept my answer by clicking the tick box on the left of my answer, below the arrows – adrCoder Mar 07 '15 at 20:04

score 0 · Answer 2 · answered Mar 07 '15 at 20:00

0

args[0]=="encode"

is WRONG!

it checks for object reference equality, not value equality!

use:

args[0].equals("encode");

or

args[0].equalsIgnoreCase("encode");

to ignore the case

answered Mar 07 '15 at 20:00

EDToaster

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Java encode and decode program cant pass key word through args

2 Answers2