在java中如何将全为数字的字符串转化为byte数组？ 在java中如何将全为数字的字符串转化为byte数组和lon...
java\u91cc\u9762byte\u6570\u7ec4\u548cString\u5b57\u7b26\u4e32\u600e\u4e48\u8f6c\u6362Java\u4e2dbyte\u6570\u7ec4\u8f6c\u6362\u6210string\u5b57\u7b26\u4e32\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528string\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002\u800cstring\u8f6cbyte\u6570\u7ec4\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528string\u7c7b\u578b\u7684getBytes\uff08\uff09\u65b9\u6cd5\u8fdb\u884c\u8f6c\u6362\uff0c\u5982\u4e0b\u5f62\u5f0f\uff1a
1\u3001string \u8f6c byte[]
String str = "Hello";//\u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32
byte[] srtbyte = str.getBytes();//\u4f7f\u7528string\u7c7b\u7684getBytes\u65b9\u6cd5\u8fdb\u884c\u8f6c\u6362
2\u3001byte[] \u8f6c string
byte[] srtbyte;//\u58f0\u660e\u4e00\u4e2abyte\u5b57\u8282\u6570\u7ec4
String res = new String(srtbyte);//\u4f7f\u7528\u6784\u9020\u51fd\u6570\u8f6c\u6362\u6210\u5b57\u7b26\u4e32
System.out.println(res);
\u4e5f\u53ef\u4ee5\u5c06byte\u8f6c\u6362\u7684\u65f6\u5019\uff0c\u8bbe\u5b9a\u7f16\u7801\u65b9\u5f0f\u76f8\u4e92\u8f6c\u6362\uff0c\u5982\u4e0b\u4ee3\u7801\uff1a
String str = "hello";
byte[] srtbyte = null;
try {
srtbyte = str.getBytes("UTF-8");//\u8bbe\u5b9a\u8f6c\u6362\u7684\u7f16\u7801\u683c\u5f0f
String res = new String(srtbyte,"UTF-8");
System.out.println(res);
} catch (UnsupportedEncodingException e) {//\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e0d\u80fd\u652f\u6301\u7684\u7f16\u7801\u683c\u5f0f\uff0c\u6355\u6349\u5f02\u5e38\u3002
e.printStackTrace();
}
String str = "1245467134974";
byte[] b = str.getBytes();
long l = Long.parseLong(str);
public static void main(String[] args){
String s="99999";
byte[] bytes=s.getBytes();
for(int i=bytes.length-1;i>=0;i--){
bytes[i]-=(byte)'0';
}
for(int i=0;i<bytes.length;i++){
System.out.print(bytes[i]);
}
System.out.println();
}
}
一楼二楼的字节数组中元素的值不是对应数位的值,是数位的ASCII码,根本不符合题意
public class Du {
public static void main(String[] args) {
String str = "9999";
str = str.replaceAll("^\\d", "");
byte[] ary = new byte[str.length()];
for(int i = 0; i < str.length(); i++){
ary[i] = (byte)str.charAt(i);
System.out.println((char)ary[i]);
}
}
}
public static void main(String[] args) {
String str = "123123123";
byte[] b = str.getBytes();
}
byte b[] = str.getBytes();
绛旓細public static void main(String[] args){ String s="99999";byte[] bytes=s.getBytes();for(int i=bytes.length-1;i>=0;i--){ bytes[i]-=(byte)'0';} for(int i=0;i<bytes.length;i++){ System.out.print(bytes[i]);} System.out.println();} } 涓妤间簩妤鐨勫瓧鑺傛暟缁勪腑鍏...
绛旓細棣栧厛灏嗗瓧绗︿覆鎷嗗垎鎴愬崟涓瓧绗﹀瓨鏀惧湪涓涓暟缁勪腑 鐒跺悗鍒ゆ柇鏁扮粍涓墍鏈夊瓧绗﹀搴旂殑int鏁板艰寖鍥存槸鍚︽槸鍦ˋSCLL涓鏁板瓧鐨鑼冨洿涔嬪唴锛堟瘮濡傝'a'鐨刬nt鏁板兼槸97锛 鑻ユ灉鏄殑璇濆氨杩斿洖true 鍚﹀垯杩斿洖false
绛旓細1銆佸畾涔変竴涓鏁板瓧瀛楃涓 String str = "1289898";2銆佹牴鎹瓧绗︿覆闀垮害鐢虫槑涓涓猧nt鏁扮粍 int ia[] = new int[str.length()];3銆佸惊鐜瓧绗︿覆锛岄氳繃charAt鑾峰彇瀛楃涓 for(int i=0;i<str.length();i++){ char c = str.charAt(i);//閫愪釜鑾峰彇瀛楃涓蹭腑鐨勫瓧绗 } 4銆佹牴鎹幏鍙栫殑瀛楃涓瞔鍑忓幓'0'瀛...
绛旓細private String floatPart;// 灏鏁板瓧杞寲涓烘眽瀛楃殑鏁扮粍,鍥犱负鍚勪釜瀹炰緥閮借浣跨敤鎵浠ヨ涓洪潤鎬 private static final char[] cnNumbers={'闆','澹','璐','鍙','鑲','浼','闄','鏌','鎹','鐜'};// 渚涘垎绾ц浆鍖栫殑鏁扮粍,鍥犱负鍚勪釜瀹炰緥閮借浣跨敤鎵浠ヨ涓洪潤鎬 private static final char[] series={...
绛旓細鎶婂瓧绗︿覆"2009-08-20" 杞崲涓哄瓧绗︿覆"20090820" 鎬庝箞寮 绛旓細鍙互鐢ㄧ畝鍗曠殑replaceAll杩涜鏇挎崲銆係tring result = "2009-08-20".replaceAll("-","");鎴栬呬娇鐢⊿impleDateFormat("yyyy-MM-dd")杩欑鏉ヨ繘琛屽鐞嗐傚浣曞皢涓涓叏鏁板瓧瀛楃涓"123456"杞崲涓篿nt鍨123456 Integer.parseInt("123456")鍗冲彲锛
绛旓細import java.util.regex.Matcher;import java.util.regex.Pattern;String str = "aaa23aa12323dsafb23213";Pattern pattern = Pattern.compile("\\d+");Matcher matcher = pattern.matcher(str);while( matcher.find()){ System.out.println(matcher.group());} ...
绛旓細Java涓鍒ゆ柇瀛楃涓叉槸鍚鍏ㄦ槸鏁板瓧锛氬彲浠ヤ娇鐢ㄦ鍒欒〃杈惧紡锛歱ublic boolean isNumeric(String str) { Pattern pattern = Pattern.compile("[0-9]*"); Matcher isNum = pattern.matcher(str); if (!isNum.matches()) { return false; } return true; }浣嗘槸杩欎釜鏂规硶骞朵笉瀹夊叏锛屾病鏈...
绛旓細public class Test {public static void main(String[] args) {System.out.println(format("鐧昏缂栧彿123456姝ｅ湪瀹℃壒杩囩▼涓"));}public static String format(String text) {for (int i = 0; i < 10; i++) {text = text.replace((char) ('0' + i), "闆朵竴浜屼笁鍥涗簲鍏竷鍏節".charA...
绛旓細1銆private static String func(String str) { 2銆Pattern p = Pattern.compile("\\d{8}");3銆Matcher m = p.matcher(str);4銆String result;5銆return result = m.find() ? m.group():null;6銆} java涓String瀛楃涓茶浆鍖涓烘暟瀛锛氳浆鎹负娴偣鍨嬶細浣跨敤Double鎴栬匜loat鐨刾arseDouble鎴栬...
绛旓細鍥炵瓟锛氬湪javascript涓湁涓涓柟娉昳sDigit()浣跨敤鏉ュ垽鏂竴涓瓧绗︿覆鏄惁閮鏄暟瀛,鍦╦ava鐨瀛楃涓插鐞嗘柟娉曚腑娌℃湁杩欐牱鐨勬柟娉,瑙夊緱甯稿父闇瑕佺敤鍒,浜庢槸涓婄綉鎼滀簡涓涓,鏁寸悊鍑轰簡涓や釜鐢ㄦ鍒欒〃杈惧紡鍖归厤鐨勫垽鏂柟娉,濡備笅; // 鍒ゆ柇涓涓瓧绗︿覆鏄惁閮涓烘暟瀛 public boolean isDigit(String strNum) { return strNum....
