关于字节编码问题

近期在做项目时，遇到以下问题。先看代码：

package test11;

public class TestStr {
	public static void main(String[] args) throws Exception {
		byte[] bytE = new byte[]{24, -122, 61, 102, -51, -78, 17, 126};
		String str2 = new String(bytE);
		byte[] bytE2 = str2.getBytes();
		for(byte b:bytE2){
			System.out.print(b + ",");
		}
	}
}

package test11;

public clas