Bytearraystream case of IO

Core code

package ioDemo;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;

    public class ByteArrayStreamDemo {
    

    public static void main(String[] args) {
    
        byteArray();
    }

    //  Extract English letters from a string 
    public static void byteArray() {
    
        String info = "123,hhh,234#$%";
        ByteArrayInputStream bais = new ByteArrayInputStream(info.getBytes(StandardCharsets.UTF_8));
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        System.out.println(bais);
        int curr = -1;

        while ((curr = bais.read()) != -1) {
    
            if ((curr >= 65 && curr <= 90) || (curr >= 97 && curr <= 122))
                baos.write(curr);
        }

        //  No need to close the flow , Byte arrays are memory based streams of operations , The root file does not matter , All do not close .
        System.out.println(baos.toString());
    }
}