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Ò»¡¢public final class String extends Object implements Serializable, Comparable, CharSequence 1¡¢ÒòΪfinalÐÞÊΣ¬ËùÒÔString²»¿ÉÒÔ±»¼Ì³Ð¡£ 2¡¢¼Ì³ÐSerializable, Comparable, CharSequence£¬ËùÒÔ¿ÉÒÔÐòÁл¯ºÍ±È½Ï ¶þ¡¢×Ö·û´®´®ÁªÊÇͨ¹ý StringBuilder£¨»ò StringBuffer£©À༰Æä append ·½·¨ÊµÏֵġ£ ÆäÖÐStringBuilder·Çͬ²½£¬StringBufferͬ²½¡£ Èý¡¢ ËÄ¡¢·½·¨ÕªÒª char charAt(int index) ·µ»ØÖ¸¶¨Ë÷Òý´¦µÄ char Öµ¡£ int codePointAt(int index) ·µ»ØÖ¸¶¨Ë÷Òý´¦µÄ×Ö·û£¨Unicode ´úÂëµã£©¡£ int codePointBefore(int index) ·µ»ØÖ¸¶¨Ë÷Òý֮ǰµÄ×Ö·û£¨Unicode ´úÂëµã£©¡£ int codePointCount(int beginIndex, int endIndex) ·µ»Ø´Ë String µÄÖ¸¶¨Îı¾·¶Î§ÖÐµÄ Unicode ´úÂëµãÊý¡£ int compareTo(String anotherString) °´×Öµä˳Ðò±È½ÏÁ½¸ö×Ö·û´®¡£ int compareToIgnoreCase(String str) °´×Öµä˳Ðò±È½ÏÁ½¸ö×Ö·û´®£¬²»¿¼ÂÇ´óСд¡£ String concat(String str) ½«Ö¸¶¨×Ö·û´®Á¬½Óµ½´Ë×Ö·û´®µÄ½áβ¡£ boolean contains(CharSequence s) µ±ÇÒ½öµ±´Ë×Ö·û´®°üº¬Ö¸¶¨µÄ char ÖµÐòÁÐʱ£¬·µ»Ø true¡£ boolean contentEquals(CharSequence cs) ½«´Ë×Ö·û´®ÓëÖ¸¶¨µÄ CharSequence ±È½Ï¡£ boolean contentEquals(StringBuffer sb) ½«´Ë×Ö·û´®ÓëÖ¸¶¨µÄ StringBuffer ±È½Ï¡£ static String copyValueOf(char[] data) ·µ»ØÖ¸¶¨Êý×éÖбíʾ¸Ã×Ö·ûÐòÁÐµÄ String¡£ static String copyValueOf(char[] data, int offset, int count) ·µ»ØÖ¸¶¨Êý×éÖбíʾ¸Ã×Ö·ûÐòÁÐµÄ String¡£ boolean endsWith(String suffix) ²âÊÔ´Ë×Ö·û´®ÊÇ·ñÒÔÖ¸¶¨µÄºó׺½áÊø¡£ boolean equals(Object anObject) ½«´Ë×Ö·û´®ÓëÖ¸¶¨µÄ¶ÔÏó±È½Ï¡£ boolean equalsIgnoreCase(String anotherString) ½«´Ë String ÓëÁíÒ»¸ö String ±È½Ï£¬²»¿¼ÂÇ´óСд¡£ static String format(Locale l, String format, Object... args) ʹÓÃÖ¸¶¨µÄÓïÑÔ»·¾³¡¢¸ñʽ×Ö·û´®ºÍ²ÎÊý·µ»ØÒ»¸ö¸ñʽ»¯×Ö·û´®¡£ static String format(String format, Object... args) ʹÓÃÖ¸¶¨µÄ¸ñʽ×Ö·û´®ºÍ²ÎÊý·µ»ØÒ»¸ö¸ñʽ»¯×Ö·û´®¡£ byte[] getBytes() ʹÓÃÆ½Ì¨µÄĬÈÏ×Ö·û¼¯½«´Ë String ±àÂëΪ byte ÐòÁУ¬²¢½«½á¹û´æ´¢µ½Ò»¸öÐ嵀 byte Êý×éÖС£ byte[] getBytes(Charset charset) ʹÓøø¶¨µÄ charset ½«´Ë String ±àÂëµ½ byte ÐòÁУ¬²¢½«½á¹û´æ´¢µ½Ð嵀 byte Êý×é¡£ void getBytes(int srcBegin, int srcEnd, byte[] dst, int dstBegin) Òѹýʱ¡£ ¸Ã·½·¨ÎÞ·¨½«×Ö·ûÕýȷת»»Îª×Ö½Ú¡£´Ó JDK 1.1 Æð£¬Íê³É¸Ãת»»µÄÊ×Ñ¡·½·¨ÊÇͨ¹ý getBytes() ·½·¨£¬¸Ã·½·¨Ê¹ÓÃÆ½Ì¨µÄĬÈÏ×Ö·û¼¯¡£ byte[] getBytes(String charsetName) ʹÓÃÖ¸¶¨µÄ×Ö·û¼¯½«´Ë String ±àÂëΪ byte ÐòÁУ¬²¢½«½á¹û´æ´¢µ½Ò»¸öÐ嵀 byte Êý×éÖС£ void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) ½«×Ö·û´Ó´Ë×Ö·û´®¸´ÖƵ½Ä¿±ê×Ö·ûÊý×é¡£ int hashCode() ·µ»Ø´Ë×Ö·û´®µÄ¹þÏ£Âë¡£ int indexOf(int ch) ·µ»ØÖ¸¶¨×Ö·ûÔÚ´Ë×Ö·û´®ÖеÚÒ»´Î³öÏÖ´¦µÄË÷Òý¡£ int indexOf(int ch, int fromIndex) ·µ»ØÔÚ´Ë×Ö·û´®ÖеÚÒ»´Î³öÏÖÖ¸¶¨×Ö·û´¦µÄË÷Òý£¬´ÓÖ¸¶¨µÄË÷Òý¿ªÊ¼ËÑË÷¡£ int indexOf(String str) ·µ»ØÖ¸¶¨×Ó×Ö·û´®ÔÚ´Ë×Ö·û´®ÖеÚÒ»´Î³öÏÖ´¦µÄË÷Òý¡£ int indexOf(String str, int fromIndex) ·µ»ØÖ¸¶¨×Ó×Ö·û´®ÔÚ´Ë×Ö·û´®ÖеÚÒ»´Î³öÏÖ´¦µÄË÷Òý£¬´ÓÖ¸¶¨µÄË÷Òý¿ªÊ¼¡£ String intern() ·µ»Ø×Ö·û´®¶ÔÏóµÄ¹æ·¶»¯±íʾÐÎʽ¡£ boolean isEmpty() µ±ÇÒ½öµ± length() Ϊ 0 ʱ·µ»Ø true¡£ int lastIndexOf(int ch) ·µ»ØÖ¸¶¨×Ö·ûÔÚ´Ë×Ö·û´®ÖÐ×îºóÒ»´Î³öÏÖ´¦µÄË÷Òý¡£ int lastIndexOf(int ch, int fromIndex) ·µ»ØÖ¸¶¨×Ö·ûÔÚ´Ë×Ö·û´®ÖÐ×îºóÒ»´Î³öÏÖ´¦µÄË÷Òý£¬´ÓÖ¸¶¨µÄË÷Òý´¦¿ªÊ¼½øÐз´ÏòËÑË÷¡£ int lastIndexOf(String str) ·µ»ØÖ¸¶¨×Ó×Ö·û´®ÔÚ´Ë×Ö·û´®ÖÐ×îÓұ߳öÏÖ´¦µÄË÷Òý¡£ int lastIndexOf(String str, int fromIndex) ·µ»ØÖ¸¶¨×Ó×Ö·û´®ÔÚ´Ë×Ö·û´®ÖÐ×îºóÒ»´Î³öÏÖ´¦µÄË÷Òý£¬´ÓÖ¸¶¨µÄË÷Òý¿ªÊ¼·´ÏòËÑË÷¡£ int length() ·µ»Ø´Ë×Ö·û´®µÄ³¤¶È¡£ boolean matches(String regex) ¸æÖª´Ë×Ö·û´®ÊÇ·ñÆ¥Å䏸¶¨µÄÕýÔò±í´ïʽ¡£ int offsetByCodePoints(int index, int codePointOffset) ·µ»Ø´Ë String ÖдӸø¶¨µÄ index ´¦Æ«ÒÆ codePointOffset ¸ö´úÂëµãµÄË÷Òý¡£ boolean regionMatches(boolean ignoreCase, int toffset, String other, int ooffset, int len) ²âÊÔÁ½¸ö×Ö·û´®ÇøÓòÊÇ·ñÏàµÈ¡£ boolean regionMatches(int toffset, String other, int ooffset, int len) ²âÊÔÁ½¸ö×Ö·û´®ÇøÓòÊÇ·ñÏàµÈ¡£ String replace(char oldChar, char newChar) ·µ»ØÒ»¸öеÄ×Ö·û´®£¬ËüÊÇͨ¹ýÓà newChar Ìæ»»´Ë×Ö·û´®ÖгöÏÖµÄËùÓÐ oldChar µÃµ½µÄ¡£ String replace(CharSequence target, CharSequence replacement) ʹÓÃÖ¸¶¨µÄ×ÖÃæÖµÌæ»»ÐòÁÐÌæ»»´Ë×Ö·û´®ËùÓÐÆ¥Åä×ÖÃæÖµÄ¿±êÐòÁеÄ×Ó×Ö·û´®¡£ String replaceAll(String regex, String replacement) ʹÓøø¶¨µÄ replacement Ìæ»»´Ë×Ö·û´®ËùÓÐÆ¥Å䏸¶¨µÄÕýÔò±í´ïʽµÄ×Ó×Ö·û´®¡£ String replaceFirst(String regex, String replacement) ʹÓøø¶¨µÄ replacement Ìæ»»´Ë×Ö·û´®Æ¥Å䏸¶¨µÄÕýÔò±í´ïʽµÄµÚÒ»¸ö×Ó×Ö·û´®¡£ String[] split(String regex) ¸ù¾Ý¸ø¶¨ÕýÔò±í´ïʽµÄÆ¥Åä²ð·Ö´Ë×Ö·û´®¡£ String[] split(String regex, int limit) ¸ù¾ÝÆ¥Å䏸¶¨µÄÕýÔò±í´ïʽÀ´²ð·Ö´Ë×Ö·û´®¡£ boolean startsWith(String prefix) ²âÊÔ´Ë×Ö·û´®ÊÇ·ñÒÔÖ¸¶¨µÄǰ׺¿ªÊ¼¡£ boolean startsWith(String prefix, int toffset) ²âÊÔ´Ë×Ö·û´®´ÓÖ¸¶¨Ë÷Òý¿ªÊ¼µÄ×Ó×Ö·û´®ÊÇ·ñÒÔÖ¸¶¨Ç°×º¿ªÊ¼¡£ CharSequence subSequence(int beginIndex, int endIndex) ·µ»ØÒ»¸öеÄ×Ö·ûÐòÁУ¬ËüÊÇ´ËÐòÁеÄÒ»¸ö×ÓÐòÁС£ String substring(int beginIndex) ·µ»ØÒ»¸öеÄ×Ö·û´®£¬ËüÊÇ´Ë×Ö·û´®µÄÒ»¸ö×Ó×Ö·û´®¡£ String substring(int beginIndex, int endIndex) ·µ»ØÒ»¸öÐÂ×Ö·û´®£¬ËüÊÇ´Ë×Ö·û´®µÄÒ»¸ö×Ó×Ö·û´®¡£ char[] toCharArray() ½«´Ë×Ö·û´®×ª»»ÎªÒ»¸öеÄ×Ö·ûÊý×é¡£ String toLowerCase() ʹÓÃĬÈÏÓïÑÔ»·¾³µÄ¹æÔò½«´Ë String ÖеÄËùÓÐ×Ö·û¶¼×ª»»ÎªÐ¡Ð´¡£ String toLowerCase(Locale locale) ʹÓøø¶¨ Locale µÄ¹æÔò½«´Ë String ÖеÄËùÓÐ×Ö·û¶¼×ª»»ÎªÐ¡Ð´¡£ String toString() ·µ»Ø´Ë¶ÔÏó±¾Éí£¨ËüÒѾ­ÊÇÒ»¸ö×Ö·û´®£¡£©¡£ String toUpperCase() ʹÓÃĬÈÏÓïÑÔ»·¾³µÄ¹æÔò½«´Ë String ÖеÄËùÓÐ×Ö·û¶¼×ª»»Îª´óд¡£ String toUpperCase(Locale locale) ʹÓøø¶¨ Locale µÄ¹æÔò½«´Ë String ÖеÄËùÓÐ×Ö·û¶¼×ª»»Îª´óд¡£ String trim() ·µ»Ø×Ö·û´®µÄ¸±±¾£¬ºöÂÔǰµ¼¿Õ°×ºÍβ²¿¿Õ°×¡£ static String valueOf(boolean b) ·µ»Ø boolean ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(char c) ·µ»Ø char ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(char[] data) ·µ»Ø char Êý×é²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(char[] data, int offset, int count) ·µ»Ø char Êý×é²ÎÊýµÄÌØ¶¨×ÓÊý×éµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(double d) ·µ»Ø double ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(float f) ·µ»Ø float ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(int i) ·µ»Ø int ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(long l) ·µ»Ø long ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£ static String valueOf(Object obj) ·µ»Ø Object ²ÎÊýµÄ×Ö·û´®±íʾÐÎʽ¡£