关于Java中byte[] 和 String互相转换问题

package com.bill.example;
 
public class StringByteArrayExamples 
{
    public static void main(String[] args) 
    {
        //Original String
        String string = "hello world";
         
        //Convert to byte[]
        byte[] bytes = string.getBytes();
        //Convert back to String
        String s = new String(bytes);
        //Check converted string against original String
        System.out.println("Decoded String : " + s);
    }
}

import java.util.Base64;
public class StringByteArrayExamples 
{
    public static void main(String[] args) 
    {
        //Original byte[]
        byte[] bytes = "hello world".getBytes();
         
        //Base64 Encoded
        String encoded = Base64.getEncoder().encodeToString(bytes);
         
        //Base64 Decoded
        byte[] decoded = Base64.getDecoder().decode(encoded);
         
        //Verify original content
        System.out.println( new String(decoded) );
    }
}

byte[] sInput = new byte[0];
try {
    // 可以指定编码，默认也只UTF-8
    sInput = "这是内容".getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
}

// 这里sInput是上面byte[]，也是可以指定编码，默认也是UTF-8
String str = new String(sInput, "UTF-8")

org.bouncycastle.pqc.math.linearalgebra.ByteUtils.toBinaryString(sInput)
// 这个方法的源码
    public static String toBinaryString(byte[] var0) {
        String var1 = "";
        for(int var2 = 0; var2 < var0.length; ++var2) {
            byte var3 = var0[var2];
            for(int var4 = 0; var4 < 8; ++var4) {
                int var5 = var3 >>> var4 & 1;
                var1 = var1 + var5;
            }
            if (var2 != var0.length - 1) {
                var1 = var1 + " ";
        }
        return var1;
    }