Java中汉字、字母、数字所占字节是多少？

待我称王封你为后i 2021-09-28 00:40 366阅读 0赞

## 1.重点： ##

不同的编码格式占字节数是不同的，UTF-8编码下一个中文所占字节也是不确定的，可能是2个、3个、4个字节；

## 2.不多说，直接上程序： ##

@Test
        public void test1() throws UnsupportedEncodingException {
            String a = "名";
            System.out.println("UTF-8编码长度:"+a.getBytes("UTF-8").length);
            System.out.println("GBK编码长度:"+a.getBytes("GBK").length);
            System.out.println("GB2312编码长度:"+a.getBytes("GB2312").length);
            System.out.println("==========================================");
    
            String c = "0x20001";
            System.out.println("UTF-8编码长度:"+c.getBytes("UTF-8").length);
            System.out.println("GBK编码长度:"+c.getBytes("GBK").length);
            System.out.println("GB2312编码长度:"+c.getBytes("GB2312").length);
            System.out.println("==========================================");
    
            char[] arr = Character.toChars(0x20001);
            String s = new String(arr);
            System.out.println("char array length:" + arr.length);
            System.out.println("content:|  " + s + " |");
            System.out.println("String length:" + s.length());
            System.out.println("UTF-8编码长度:"+s.getBytes("UTF-8").length);
            System.out.println("GBK编码长度:"+s.getBytes("GBK").length);
            System.out.println("GB2312编码长度:"+s.getBytes("GB2312").length);
            System.out.println("==========================================");
        }

## 3.结果： ##

UTF-8编码长度:3
    GBK编码长度:2
    GB2312编码长度:2
    ==========================================
    UTF-8编码长度:7
    GBK编码长度:7
    GB2312编码长度:7
    ==========================================
    char array length:2
    content:|  ? |
    String length:2
    UTF-8编码长度:4
    GBK编码长度:1
    GB2312编码长度:1
    ==========================================

# Unicode 编码参考播客：[https://blog.csdn.net/hezh1994/article/details/78899683][https_blog.csdn.net_hezh1994_article_details_78899683] #

[https_blog.csdn.net_hezh1994_article_details_78899683]: https://blog.csdn.net/hezh1994/article/details/78899683