看看String类的构造方法
类别: JAVA教程 
String
public String(byte[] bytes,
String enc)
throws UnsupportedEncodingException
Construct a new String by converting the specified array of bytes using the specified character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the byte array.
Parameters:
bytes - The bytes to be converted into characters
enc - The name of a supported character encoding
Throws:
UnsupportedEncodingException - If the named encoding is not supported
Since:
JDK1.1
public String(byte[] bytes,
String enc)
throws UnsupportedEncodingException
Construct a new String by converting the specified array of bytes using the specified character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the byte array.
Parameters:
bytes - The bytes to be converted into characters
enc - The name of a supported character encoding
Throws:
UnsupportedEncodingException - If the named encoding is not supported
Since:
JDK1.1
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