why java String's getBytes method return different result?

Question

I wrote a simple code:

public class Maintest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String key = "12345testabcd";
        System.out.println(key.getBytes());
        System.out.println(key.getBytes());
    }

}

when I run it the two print results are different.Why?Is this println related?Thx.

Does this answer your question? [What's the simplest way to print a Java array?](https://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array) — knittl, Mar 24 '23 at 20:17
You aren't printing the contents of the byte array, you're printing the identity hash code, which is sort of like its memory location. — Louis Wasserman, Mar 24 '23 at 21:09

score 3 · Answer 1 · answered Mar 24 '23 at 20:09

You are seeing the default toString for each byte[] which is different each time as you get different byte[] instances back for each key.getBytes() call. Use this to see the contents of each byte array, they will have same values for same value of key:

System.out.println(Arrays.toString(key.getBytes()));

why java String's getBytes method return different result?

1 Answers1