new String()默认的编码是什么?

Question

不同的系统中new String()出来的字符串编码是不是一样的?
不同系统下new String的默认编码是什么呢?

Answer 1

这个问题其实直接跟进 java的源码就知道了：
用的是Charset.defaultCharset().name();

[code="java"]
public String(byte bytes[]) {
this(bytes, 0, bytes.length);
}

public String(byte bytes[], int offset, int length) {
checkBounds(bytes, offset, length);
char[] v = StringCoding.decode(bytes, offset, length);
this.offset = 0;
this.count = v.length;
this.value = v;
}

static char[] decode(byte[] ba, int off, int len) {
String csn = Charset.defaultCharset().name();
try {
return decode(csn, ba, off, len);
} catch (UnsupportedEncodingException x) {
warnUnsupportedCharset(csn);
}
try {
return decode("ISO-8859-1", ba, off, len);
} catch (UnsupportedEncodingException x) {
// If this code is hit during VM initialization, MessageUtils is
// the only way we will be able to get any kind of error message.
MessageUtils.err("ISO-8859-1 charset not available: "
+ x.toString());
// If we can not find ISO-8859-1 (a required encoding) then things
// are seriously wrong with the installation.
System.exit(1);
return null;
}
}

[/code]