java字符串12345怎么取到数字1 JAVA怎样快速把字符串里面的数字取出来
\u8bf7\u95eejava\u600e\u4e48\u63d0\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u6570\u5b57(\u542b\u5c0f\u6570\u70b9)\u3002\u4f8b\u5982\uff1a\u91d1\u989d\u4e3a12345.78 \uff0c\u7ed3\u679c\u4e3a12345.78public static void main(String[] args)
{
String a = "a1v2.3s5";
char[] b = a.toCharArray();
String result = "";
for (int i = 0; i < b.length; i++)
{
if (("0123456789.").indexOf(b[i] + "") != -1)
{
result += b[i];
}
}
System.out.println(result);
}
\u628a\u5b57\u6bcd\u66ff\u6362\u6210\u6c49\u5b57\u4e00\u6837\u7684\u3002
public static void main(String[] args)
{
String a = "\u91d1\u989d\u4e3a12.35";
char[] b = a.toCharArray();
String result = "";
for (int i = 0; i < b.length; i++)
{
if (("0123456789.").indexOf(b[i] + "") != -1)
{
result += b[i];
}
}
System.out.println(result);
}
char[] charArray=date.toCharArray();
//\u8fd9\u662f\u65b9\u6cd5\u4e00 \u83b7\u5f97\u56fa\u5b9a\u4f4d\u7f6e\u4e0a\u7684\u6570\u5b57\uff0c\u56e0\u4e3a\u6211\u770b\u4f60\u8fd9\u4e2a\u6570\u5b57\u662f\u5728\u56fa\u5b9a\u4f4d\u7f6e\u4e0a\u7684\uff0c\u6240\u4ee5\u8bba\u901f\u5ea6\u8fd9\u4e2a\u662f\u6700\u5feb\u7684\u6ca1\u6709\u5224\u65ad\u76f4\u63a5\u83b7\u53d6
String newDate=charArray[0]+charArray[1]+charArray[2]+charArray[3]+charArray[5]+charArray[6]+charArray[8]+charArray[9];
\u65b9\u6cd5\u4e8c\uff1a
\u5bf9charArray\u8fdb\u884c\u904d\u5386\uff0c\u5982\u679c\u662f\u6570\u5b57\u5c31\u52a0\u5230\u65b0\u7684\u5b57\u7b26\u4e32\u7684\u5c3e\u5df4\u4e0a\u3002\u8fd9\u79cd\u9700\u8981\u5224\u65ad\u5f88\u591a\u6b21\uff0c\u901f\u5ea6\u6ca1\u90a3\u4e48\u5feb\u3002
\u65b9\u6cd5\u4e09\uff1a\u4f60\u53ef\u4ee5\u770b\u770b\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u65b9\u6cd5\u3002
\u65b9\u6cd5\u56db\uff1a\u9006\u5411\u601d\u7ef4\uff0c\u5982\u679c\u662f"-"\u6216\u8005\u662f" "," : "\u5c31\u8fc7\u6ee4\u6389
\u6211\u8bf4\u7684\u90fd\u662f\u539f\u7406\uff0c\u4ed6\u4eec\u8bf4\u7684\u90fd\u662f\u65b9\u6cd5\u3002\u4f46\u662f\u6700\u5feb\u7684\u80af\u5b9a\u662f\u6211\u7684\u7b2c\u4e00\u4e2a\u65b9\u6cd5\u3002\u522b\u4eba\u7684\u548c\u6211\u7684\u65b9\u6cd5\u4e8c\u548c\u56db\u7c7b\u4f3c\u3002
String aa="12345";
//先把字符串变成数组[1,2,3,4,5]
String [] a=aa.split("");
//按脚标取就可以
System.out.println(a[0]);
最简单的方法，你先利用split把字符串变成数组，然后用下标取就行。
有问题可以追问，望采纳。
chatat（）方法，然后强转为int类型的数据
绛旓細鍙栧瓧绗︿覆鍚3浣,浠ｇ爜:String s="12345";int n=3;String b=aa.substring(aa.length()-n,aa.length())銆
绛旓細瀛楃涓鎴彇,substring(int beginIndex) 杩斿洖涓涓柊鐨勫瓧绗︿覆锛屽畠鏄瀛楃涓茬殑涓涓瓙瀛楃涓层俿ubstring(int beginIndex, int endIndex) 杩斿洖涓涓柊瀛楃涓诧紝瀹冩槸姝ゅ瓧绗︿覆鐨勪竴涓瓙瀛楃涓层俠eginIndex - 璧峰绱㈠紩锛堝寘鎷級銆備粠0寮濮 endIndex - 缁撴潫绱㈠紩锛堜笉鍖呮嫭锛夈"12345".substring(3) returns "45""...
绛旓細public static void main(String[] args) { Test t = new Test(12345);t.show();} }
绛旓細String aa="12345";//鍏堟妸瀛楃涓鍙樻垚鏁扮粍[1,2,3,4,5]String [] a=aa.split("");//鎸夎剼鏍囧彇灏卞彲浠ystem.out.println(a[0]);鏈绠鍗曠殑鏂规硶锛屼綘鍏堝埄鐢╯plit鎶婂瓧绗︿覆鍙樻垚鏁扮粍锛岀劧鍚庣敤涓嬫爣鍙栧氨琛屻傛湁闂鍙互杩介棶锛屾湜閲囩撼銆
绛旓細鍦Java涓幏鍙瀛楃涓涓寚瀹氱殑鍊煎彲浠ヤ娇鐢ㄤ互涓嬪嚑绉嶆柟寮忥細鐐瑰嚮瀛︿範澶у巶鍚嶅笀绮惧搧璇1.浣跨敤substring()鏂规硶鍙互浣跨敤String绫绘彁渚涚殑substring(intbeginIndex锛宨ntendIndex)鏂规硶锛屼粠鍘熷瀛楃涓蹭腑鎴彇鍑烘寚瀹氳寖鍥寸殑瀛楃瀛愪覆銆俠eginIndex琛ㄧず鎴彇鐨勮捣濮嬩綅缃紝endIndex琛ㄧず缁撴潫浣嶇疆锛堜笉鍖呭惈锛夈2.浣跨敤StringUtils绫诲彲浠ヤ娇鐢ˋpache...
绛旓細濡傛灉鏄瀛楃涓鍙互浣跨敤 String s = "12345";String s1 = s.substring(s.length()-2);String s2 = s.substring(s.length()-4,s.length()-2);String s3 = s.substring(0,1);濡傛灉鏄暟鍊硷細int i = 12345;int i1 = i % 100;int i2 = (i / 100) % 100;int i3 = i / 10000 ...
绛旓細鐢╢or寰幆charAt(),鍦12345鍚+= ("="+charAt(i));String str = "12345";String res = "";for (int i = 0; i < str.length(); i++) { res += ("=" + str.charAt(i));} System.out.println(str+res);
绛旓細public class Example{ public static void main(String cuiSir[]){ String numberStr="12345"; //鎼炰竴涓瀛楃涓涓浼氭尐涓暣鍑烘潵銆傚綋鐒朵綘鐢ㄥ埆鐨勫姙娉曚篃琛 StringBuffer sb=new StringBuffer(); //鏁翠釜SB锛屼笉鏄獋浜虹殑鎰忔濆彇鍓嶉潰涓や釜缂╁啓銆傝繕鏈夛紝鐢ㄨ繖涓被鍨嬫晥鐜囬珮 for(int i=numberStr.length()-1;i...
绛旓細妤间笂璇寸殑涔熶笉瀵癸紝LZ闂殑鏄JAVA锛屼綘鍐欑殑鏄疛avaScript銆備笉杩囨柟娉曞樊涓嶅鐨勩係tring str="12345 abcde 涓浜屼笁鍥涗簲";String ss[]=str.split(" ");for(int i=0;i<ss.length;i++){ System.out.println("ss="+ss[i]);} 杈撳嚭缁撴灉涓猴細ss=12345 ss=abcde ss=涓浜屼笁鍥涗簲 ...
绛旓細for (int i = 5; i >0; i--) { for (int j = 1; j <= i; j++) { System.out.print(j+" ");} System.out.println();}
