编码与解码及String与char[]转换

编码与解码String->char[]

package hanshunpingjava.changYonglei;

import java.nio.charset.StandardCharsets;
import java.util.Arrays;

public class stringchar {
    public static void main(String[] args) {
        String s = "king james";
        char[] ch1 = s.toCharArray();   //String -> char[]
        for (int i = 0; i < s.length(); i++) {
            System.out.println(ch1[i]);
        }
        char[] ch2 = {'m','e','l','o'};
        String s1 = new String(ch2);// char[] -> String
        System.out.println(s1);

        //-------------------------------------------------------------------------------


        //String -->byte[]  调用String 的getBytes();

        String s2 = "abc123";
        byte[] b = s2.getBytes();//默认的字符集UTF-8
        //编码 ：由字符串-->字节（看的懂得-->看不懂的）
        System.out.println(Arrays.toString(b));//编码
        //解码：编码的逆过程
        String s3 = new String(b);
        System.out.println(s3);
        //编码集与解码集不一致会出现乱码


    }
}