How do I store several values in byte array in Java?

Question

So I am currently trying to save and load Data for my Java application. Now i am trying to save all my data in one big byte[] which I can than write to a file using Base64. I've seen something like this before, where you can do writeString(String s) to write a String to a byte[] and use readString() to read the String from the byte[] . I was wondering how exactly this works; How can I write several values to the byte[] and know when one Value ends and another begins. With Integers it would be easy, because they have a fixed size, but Strings are dynamic, so how can I see when the String in the byte[] ends?

I already managed to write data to a byte[] using the ByteBufferOutputStream and now I need to know how I can discriminate the different values. Could I for example insert a 0x0 -byte where the String's bytes end to know when to stop reading the byte[] ?

Answer 1

可以使用0x00表示字符串的结尾，也可以先存储字符串的长度，然后再存储数据字节。