Question

当我运行我的程序时，它会写入文件，但它只会写入第一个坐标：

[79.93768569366277, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0], 
    [0.0, 0.0],

其余的是[0.0。 0.0]其中应该是程序生成的其他随机数。

为什么？该程序将程序生成的坐标写入另一个文件。代码：

 import java.io.*;
    import java.util.Arrays;

    public class J4
    {
      public static void main (String [] args) throws IOException
      {
        int numpoints = 100, dimension = 2, length = 100;//numpoints is set to 100, dimension is set to 2, length is set to 100

        //arrays are initializewd and declared
        double [] lengthscale = new double [dimension];
        double [][] locations = new double [numpoints][dimension];

        PrintWriter fileOut = new PrintWriter (new FileWriter ("arrayNumPoints.txt"));

         writefile(lengthscale, locations, dimension, numpoints, length);


        for(int m=0; m <length; m++){//for loop
          fileOut.println(Arrays.toString(locations[m]) + ", ");//writes to file
        }
        fileOut.close ();//close file

      }//end main

      public static Double writefile(double lengthscale[], double locations[][], int dimension, int numpoints, int length)throws IOException
      {

        for (int a = 0; a < dimension; a++) {// for loop runs while a is less than dimension
      lengthscale[a] = length;// stores array
    }// end for loop

        for (int x=0; x < numpoints; x++){//for loop runs while x is less than numpoints
          for (int y=0; y < dimension; y++){//nested for loop runs while y is less than dimension
            locations [x][y]= (2 * Math.random() - 1) * lengthscale[y];//creates the range and choses random point within 
              return locations[x][y];

          }//end nested for loop
        }//end for loop

        //if program doesnt run through loop.. alternative return statement (but
         double b= 1;    
         return b;
      }//end writefile methos
    }//end cass

Answer 1

这是调试器可以提供帮助的地方。

它会告诉你循环中有一个返回，并且在第一个位置[x] [y]被设置后返回。删除不需要的return语句，我建议您尝试使用调试器，因为它旨在帮助您查找错误。

写入文件java

1 个答案: