1. 测试用例如下：

```
@Test
   public void test1(){
       Object value = 23;
       logger.info("object1={};object2={}", Integer.parseInt(String.valueOf(value)), (Integer)value);

Object value1 = 23.32;
logger.info("object1={};object2={}", Double.parseDouble(String.valueOf(value1)), (Double)value1);

logger.info("String.valueOf(23) = {}", String.valueOf(value));
logger.info("String.valueOf(23.32) = {}", String.valueOf(value1));

logger.info("object1={}", String.valueOf(value).contains(".")?Double.parseDouble(String.valueOf(value)):Integer.parseInt(String.valueOf(value)));
logger.info("object2={}", String.valueOf(value1).contains(".")?Double.parseDouble(String.valueOf(value1)):Integer.parseInt(String.valueOf(value1)));

logger.info("object1={}", String.valueOf(value).contains(".")?(Double)value:(Integer)value);
logger.info("object2={}", String.valueOf(value1).contains(".")?(Double)value1:(Integer)value1);

       if(String.valueOf(value).contains(".")){
           logger.info("String.valueOf1(value):{}", String.valueOf(value));
       }else{
           logger.info("String.valueOf2(value):{}", String.valueOf(value));
       }
       if(String.valueOf(value).contains(".")){
           logger.info("convert1(value):{}", (Double)value);
       }else{
           logger.info("convert2(value):{}", (Integer)value);
       }
   }
```
2. 输出如下：

```
22:06:54.523 [main] INFO com.tikie.eureka.core.NormalTest - object1=23;object2=23
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - object1=23.32;object2=23.32
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - String.valueOf(23) = 23
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - String.valueOf(23.32) = 23.32
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - object1=23.0
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - object2=23.32
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - object1=23.0
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - object2=23.32
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - String.valueOf2(value):23
22:06:54.528 [main] INFO com.tikie.eureka.core.NormalTest - convert2(value):23

```
3. 为何同样的调用，有两个输出多了".0"??

标题

c# 后台给select下拉框设置默认值

残缺丶

3个回复