Java中如何正确的将byte[]数组转化为String类型?
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();
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:
1 scanner scan=new scanner(system.in); 2 string s="ghhhh"; 3 byte[]a=s.getbytes(); 4 string s1=a.tostring(); 5 string s2=new string(a); 6 system.out.println("s1:"+s1); 7 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())
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。
因此,下次不要用错方法咯!