javabyte数组转string(java byte类型相加)

蜗牛 互联网技术资讯 2022-04-28 101 0

很多人在编程时,总是喜欢用一下方法将数组转为字符串:(a为byte数组)

String s=a.toString();

RW.hao22。COm

可是每次返回的时候,新手看来返回的结果是乱码,比如说我,写RSA算法时,没有注意,就以为是解密出来的乱码(哈哈哈),但其实[B@1b6d3586 为栈地址值,这个时候要知道对于返回一个String对象,new一个是基本上不会错的,测试代码如下:

Scanner scan=new Scanner(System.in);
 String s="ghhhh";
 byte[]a=s.getBytes();
 String s1=a.toString();
 String s2=new String(a);
 System.out.println("s1:"+s1);
 System.out.println("s2:"+s2);

测试结果:

1 s1:[B@1b6d3586
2 s2:ghhhh

可以看到s1所对应的方法只是返回的byte数组的地址值,而s2才真正返回了a的实体值。

这是因为,String java.lang.Object.toString()返回的确实是地址值,介绍如下:

Returns a string representation of the object. In general, the toString method returns a string that “textually represents” this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@’, and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

getClass().getName() + ‘@’ + Integer.toHexString(hashCode())

RW.hao22。COm

大体意思就是类Object的toString方法返回一个字符串,该字符串由对象为实例的类的名称、符号符号符号“@”和对象哈希代码的无符号十六进制表示组成。换句话说,此方法返回一个字符串。

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