java中怎么截取字符串中的数字 java截取字符串 如何截取小数点以前的字符？比如1234....
\u600e\u4e48\u4ecejson\u5b57\u7b26\u4e32\u4e2d\u622a\u53d6\u5b57\u7b26\u4e32\u8fd9\u6837\u7684\u8bdd\uff0c\u53ea\u9700\u8981\u622a\u53d6\u9700\u8981\u7684\u5b57\u7b26\u4e32\u5373\u53ef\u3002
\u4e3e\u4f8b\uff1a
public static void main(String[] args) {
String parse="[{CSTM_NO:\"11118\",CSTM_NAME:\"\u5e7f\u4e1cXX\u7535\u529b\u6709\u9650\u516c\u53f8\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070003\",OP_FLAG:\"\u6b63\u5e38\",BUSS_KIND_NAME:\"\u4e09\u4e2a\u6708\u5b9a\u671f\u5b58\u6b3e\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:1,idx:0},{CSTM_NO:\"11118\",CSTM_NAME:\"\u5e7f\u4e1cXX\u7535\u529b\u6709\u9650\u516c\u53f8\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070002\",OP_FLAG:\"\u6b63\u5e38\",BUSS_KIND_NAME:\"\u4e09\u4e2a\u6708\u5b9a\u671f\u5b58\u6b3e\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:3,idx:2},{CSTM_NO:\"11118\",CSTM_NAME:\"\u5e7f\u4e1cXX\u7535\u529b\u6709\u9650\u516c\u53f8\",FIX_GNL:\"111810158\",FIX_ACC:\"D201306070005\",OP_FLAG:\"\u6b63\u5e38\",BUSS_KIND_NAME:\"\u4e09\u4e2a\u6708\u5b9a\u671f\u5b58\u6b3e\",BAL:\"25,178,750.00\",AVAL_BAL:\"25,178,750.00\",OP_DATE:\"2013-06-07\",DUE_DATE:\"2013-12-07\",ROWNUM_:4,idx:3}]";
String regex="FIX_ACC:(.*?),OP_FLAG";//\u522b\u5fd8\u4e86\u4f7f\u7528\u975e\u8d2a\u5a6a\u6a21\u5f0f\uff01
Matcher matcher=Pattern.compile(regex).matcher(parse);
while(matcher.find())
{
String ret=matcher.group(1);
System.out.println(ret);
}
}
\u65b9\u6cd5\u4e00\uff1a\u627e\u5230\u5c0f\u6570\u70b9\u4f4d\u7f6e\u7136\u540e\u622a\u53d6String number = "123.456";String intNumber = number.substring(0,number.indexOf("."));System.out.println(intNumber); \u65b9\u6cd5\u4e8c\uff1a\u8f6c\u6210\u6570\u5b57\u7136\u540e\u8f6c\u6362\u4e3a\u6574\u6570\u518d\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32
String number = "123.456";System.out.println(String.valueOf(Math.floor(Double.parseDouble(number))));\u65b9\u6cd5\u4e09\uff1a\u7528\u5c0f\u6570\u70b9\u5206\u5272\u53d6\u7b2c\u4e00\u4e2a\u7ed3\u679c\uff1a
String number = "123.456";System.out.println(number.split(".")[0]);
java中截取字符串中的数字方法有很多，例如用正则表达式。试一试下面的演示程序吧。
public class SplitTest
{
public static void main(String[] args)
{
String input = "jdiwo3495jis90.5jsie4dss56djiw9";
String regex = "\\d+(\\.\\d+)?";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
while(matcher.find())
{
System.out.println(matcher.group());
}
}
}
substring
public class Test {
public static void main(String[] args) {
String a="123fggs2fg6";
for(int i=0;i<a.length();i++)
{
String one=a.substring(i, i+1);
char ar=one.charAt(0);
if(ar>='0' && ar<='9' )
{
//是数字
System.out.println(ar);
}
}
}
}
把字符串拆分为字符，根据每一位判断出来，如果为数字的话，就提取出来
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