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StringÀàÖеĹ¹Ô캯Êý
String(); ¹¹ÔìÒ»¸ö¿Õ×Ö·û´®¶ÔÏó
String(byte[] bytes); ͨ¹ýbyteÊý×é¹¹Ôì×Ö·û´®¶ÔÏó
String(byte[] bytes,int offset,int length);ͨ¹ýbyteÊý×飬´Óoffset¿ªÊ¼£¬×ܹ²length³¤µÄ×Ö½Ú¹¹Ôì×Ö·û´®¶ÔÏó
String(char[] value); ͨ¹ýcharÊý×é¹¹Ôì×Ö·û´®¶ÔÏó
String(byte[] char,int offset,int length);ͨ¹ýcharÊý×飬´Óoffset¿ªÊ¼£¬×ܹ²length³¤µÄ×Ö½Ú¹¹Ôì×Ö·û´®¶ÔÏó
String(String original); ¹¹ÔìÒ»¸öoriginalµÄ¸±±¾£¬¿½±´Ò»¸öoriginal
String(StringBuffer buffer);ͨ¹ýStringBufferÊý×é¹¹Ôì×Ö·û´®¶ÔÏó
public class StringClassTest {
    public static void main(String[] args) {
        // ×Ö½ÚÊý×é
        byte[] bArray = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' };
        // ×Ö·ûÊý×é
        char[] cArray = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' };
        //ÉùÃ÷Ò»¸öStringBuffer
        StringBuffer strbuf = new StringBuffer("strbuf");
        // ʵÀýÒ»¸öString¶ÔÏó
        String str = new String("str abcd");
        //ʵÀýÒ»¸öString¶ÔÏó ͨ¹ýÒ»¸öbtyeÊý×é¹¹Ôì×Ö·û´®¶ÔÏó£¨×Ö½ÚÊý×飩
        String strb = new String(bArray);
        //ʵÀýÒ»¸öString¶ÔÏó ͨ¹ýÒ»¸öcharÊý×é¹¹Ôì×Ö·û´®¶ÔÏó£¨×Ö·ûÊý×飩
        String strc = new String(cArray);
        //ʵÀýÒ»¸öString¶ÔÏó ͨ¹ýÒ»¸öcharÊý×é¹¹Ôì×Ö·û´®¶ÔÏó(×Ö½ÚÊý×飬¿ªÊ¼µÄÊý¾Ý£¬½ØµÃÊý¾Ý³¤¶È)
        String strbIndex = new String(bArray, 1, 5);
        //ʵÀýÒ»¸öString¶ÔÏó ͨ¹ýÒ»¸öcharÊý×é¹¹Ôì×Ö·û´®¶ÔÏó£¨×Ö·ûÊý×飬¿ªÊ¼µÄÊý¾Ý£¬½ØµÃÊý¾Ý³¤¶È£©
        String strcIndex = new String(cArray, 1, 2);
        //ʵÀýÒ»¸ö


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Java ÈÕÆÚ¼Ó減

public static void main(String[] args) {
   String DATE_FORMAT = "yyyy-MM-dd";
   java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(
     DATE_FORMAT);
   Calendar c1 = Calendar.getInstance();
   c1.set(1999, 0, 14);
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