格式化字符串以删除科学记数法 - Java [英] Formatting a String to Remove Scientific Notation - Java

问题描述

我有下面的代码拆分了一串数字（用空格分隔），然后创建一个浮点数组：

  //分割字符串，然后用值创建一个浮点数组。 
 String [] tabOfFloatString = value.split（）; 
 int length = tabOfFloatString.length; 
 System.out.println（float string的长度是+ length）; 
 float [] floatatsArray = new float [length]; 
 for（int l = 0; l  float res = Float.parseFloat（tabOfFloatString [l]）; 
 System.out.println（Float is+ res）; 
 floatsArray [l] = res; 
 
 
 
 
 
 $ b 
问题在于字符串中的某些值用科学记数法格式化 - 例如，他们阅读-3.04567E-8。
 
 
我想要做的是以不包含E号码的浮点数结束。
 
 
 
我一直在阅读这个线程，这表明我可以使用BigDecimal，但是我无法得到这个工作 - 这是最好的办法还是应该尝试别的？ 如何转换字符串3.0103 E-7到0.00000030103在Java？ 
解决方案
下面是你的代码稍作修改。按照我的说法，这样做效果不错，实际上并不关心指数的顺序：
 
 pre $ public void function（）{
 String value =123456.0023 -3.04567E-8 -3.01967E-20; 
 String [] tabOfFloatString = value.split（）; 
 int length = tabOfFloatString.length; 
 System.out.println（float string的长度是+ length）; 
 float [] floatatsArray = new float [length]; 
 for（int l = 0; l  String res = new BigDecimal（tabOfFloatString [l]）。toPlainString（）; 
 System.out.println（Float is+ res）; 
 floatsArray [l] = Float.parseFloat（res）; 
} 
 
} 
  

I have the following code which splits a string of numbers (separated by a space) and then creates an array of floats :

//Split the string and then build a float array with the values.
String[] tabOfFloatString = value.split(" ");
int length = tabOfFloatString.length;
System.out.println("Length of float string is" + length);
float[] floatsArray = new float[length];
for (int l=0; l<length; l++) {
float res = Float.parseFloat(tabOfFloatString[l]);
    System.out.println("Float is " + res);
    floatsArray[l]=res;
}

The problem is that some of the values in the string are formatted with scientific notation - e.g they read -3.04567E-8.

What I want to do is end up with a float which does not contain the E number.

I have been reading this thread which suggests that I could use BigDecimal, however am unable to get this to work - is this the best approach or should I try something else ? How to convert a string 3.0103E-7 to 0.00000030103 in Java?

解决方案

Below is your code slightly modified. As per me this works well and doesn't actually cares he order of the exponents:

public void function() {
    String value = "123456.0023 -3.04567E-8 -3.01967E-20";
    String[] tabOfFloatString = value.split(" ");
    int length = tabOfFloatString.length;
    System.out.println("Length of float string is" + length);
    float[] floatsArray = new float[length];
    for (int l = 0; l < length; l++) {
        String res = new BigDecimal(tabOfFloatString[l]).toPlainString();
        System.out.println("Float is " + res);
        floatsArray[l] = Float.parseFloat(res);
    }

}

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