从解析 String 到 double 的转换返回 0.0：

Question

这是对我就此主题提出的最后一个问题的跟进。不过这是一个不同的问题。

除了使用 copyOfRange 复制某种地址外，我的代码可以正常工作。由于某种地址，它总是 returns 0.0，而不是数组 getBits 的部分。

有人可以扫描这个并提出建议吗？我为此疯狂（这不是作业）。

package runTests;

import java.util.Arrays;

public class runTestGetBinaryStrands {
    protected static int getBits[] = {1,0,1,1,0,1,0,0,0,1,1,0,1,0,1,0};
    double numerator, denominator, x, y;

    public static void main (String[] args){
        runTestGetBinaryStrands test = new runTestGetBinaryStrands();
        test.getNumber(null, getBits);
    }
    /*NOTE OF THIS FORLOOP:     * Divided the bits array in half & convert two different binary values to a string  * I parsed the string to an int value, which can be put saved to a double and be treated like a decimal value.  * I got the first 8 elements and stashed them into numerator, and did the same for denominator for the remaining array bits.    * * The chromosome has one binary string, made up of a bunch of smaller parts.* You use getNumber in the chromosome to get out the values of the parts.     **/     

    public void getNumber(String convert, int[] tempBinary){       
        for (int i = 0; i < getBits.length; i++){
            for(int j = 0; j < getBits.length; j++){ //start at index 0 to 7 = 8.
                tempBinary = Arrays.copyOfRange(getBits, 0, 7); //Get first set of 8 elements.
                convert = tempBinary.toString();
                System.out.println(convert);
                try{
                    numerator = Integer.parseInt(convert); //converts string to one whole section in
                }catch (NumberFormatException ex){
                }
                System.out.println("See Numerator's value: " + numerator);                          
                tempBinary= Arrays.copyOfRange(getBits, 8, 15); //Get Second set of 8 elements.
                convert = tempBinary.toString();
                try{
                    denominator = Integer.parseInt(convert); //converts string to one whole section in
                }
                catch (NumberFormatException ex){
                }                           
                System.out.println("See Denominator's value: " + denominator);
            } 
        } 
    } 
}

Answer 1

将行 convert = tempBinary.toString(); 替换为：

    convert = "";
    for(int bin : tempBinary){
      convert += bin;
    }

这应该能让您的转换正常进行。

从解析 String 到 double 的转换返回 0.0：

Conversion from parsing a String to double is returning 0.0:

java

arrays

parsing

type-conversion

double