Java中通过substring和charAt截取字符串并获取指定字符

Love The Way You Lie 2023-10-18 21:15 62阅读 0赞

## 场景 ##

字符串类似如下

![Image 1][]![20190709154823920.jpg][]

现在要获取S:后面的数字9

## 实现 ##

indedOf方法，获取某字符所在下标。

flightResult.getCabinString().indexOf(flightResult.getDefaultCabin().getCabinCode())

相当于

“abcd”.indexOf("b")

如果是第25位则返回下标为24

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

然后使用substring进行截取，从上面的下标开始一直截取到最后

String cabinNum = flightResult.getCabinString().substring(cabin);

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

通过charAt获取第三个字符

char  cabinNum2 = cabinNum.charAt(2);

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

完整示例代码

for (FlightResult flightResult : book.getFlightResult()) {
         if (flightResult.getCabinString().contains(flightResult.getDefaultCabin().getCabinCode())) {
          if(flightResult.getCabinString().substring(flightResult.getCabinString().indexOf(flightResult.getDefaultCabin().getCabinCode())).indexOf(2)!=0) {
           int cabin = flightResult.getCabinString().indexOf(flightResult.getDefaultCabin().getCabinCode());
           String cabinNum = flightResult.getCabinString().substring(cabin);
           char  cabinNum2 = cabinNum.charAt(2);
           if(cabinNum2=='A') {
            //10以及以上用A代替
           }
           else if(Integer.valueOf(cabinNum2)<BookSeatNum) {
            CabinEnough=0;
           }
           cabinInfo="1";
           break;
          }
         }
        }

[Image 1]: 
[20190709154823920.jpg]: https://img-blog.csdnimg.cn/20190709154823920.jpg
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