我试图用简单的爬山算法来解决旅行推销员的问题。我想要创建一个Java程序来完成这个任务。我知道这不是最好的方法,但我主要希望它能看到结果,然后将结果与我将创建的以下结果进行比较:
无论如何,回到简单的爬山算法,我已经有了以下内容:
import java.util.*;
public class HCSA
{
static private Random rand;
static public void main(String args[])
{
for(int i=0;i<10;++i) System.out.println(UR(3,4));
}
static public double UR(double a,double b)
{
if (rand == null)
{
rand = new Random();
rand.setSeed(System.nanoTime());
}
return((b-a)*rand.nextDouble()+a);
}
}这就是我所需要的吗?这个密码对吗..?我在文本文档中有一系列不同的数据集,我希望程序从中读取这些数据集,然后生成结果。
我真的很感激你在这方面的帮助。
--编辑--编辑--
我是个白痴,把Java文件直接打开到Eclipse中,而我应该先用记事本打开它。这是我现在得到的代码。
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.Reader;
import java.io.StreamTokenizer;
import java.util.ArrayList;
{
//Print a 2D double array to the console Window
static public void PrintArray(double x[][])
{
for(int i=0;i<x.length;++i)
{
for(int j=0;j<x[i].length;++j)
{
System.out.print(x[i][j]);
System.out.print(" ");
}
System.out.println();
}
}
//reads in a text file and parses all of the numbers in it
//is for reading in a square 2D numeric array from a text file
//This code is not very good and can be improved!
//But it should work!!!
//'sep' is the separator between columns
static public double[][] ReadArrayFile(String filename,String sep)
{
double res[][] = null;
try
{
BufferedReader input = null;
input = new BufferedReader(new FileReader(filename));
String line = null;
int ncol = 0;
int nrow = 0;
while ((line = input.readLine()) != null)
{
++nrow;
String[] columns = line.split(sep);
ncol = Math.max(ncol,columns.length);
}
res = new double[nrow][ncol];
input = new BufferedReader(new FileReader(filename));
int i=0,j=0;
while ((line = input.readLine()) != null)
{
String[] columns = line.split(sep);
for(j=0;j<columns.length;++j)
{
res[i][j] = Double.parseDouble(columns[j]);
}
++i;
}
}
catch(Exception E)
{
System.out.println("+++ReadArrayFile: "+E.getMessage());
}
return(res);
}
//This method reads in a text file and parses all of the numbers in it
//This code is not very good and can be improved!
//But it should work!!!
//It takes in as input a string filename and returns an array list of Integers
static public ArrayList<Integer> ReadIntegerFile(String filename)
{
ArrayList<Integer> res = new ArrayList<Integer>();
Reader r;
try
{
r = new BufferedReader(new FileReader(filename));
StreamTokenizer stok = new StreamTokenizer(r);
stok.parseNumbers();
stok.nextToken();
while (stok.ttype != StreamTokenizer.TT_EOF)
{
if (stok.ttype == StreamTokenizer.TT_NUMBER)
{
res.add((int)(stok.nval));
}
stok.nextToken();
}
}
catch(Exception E)
{
System.out.println("+++ReadIntegerFile: "+E.getMessage());
}
return(res);
}
}发布于 2011-03-15 05:42:50
我不知道你粘贴的代码和旅行推销员有什么关系。您有一个函数UR,它在间隔[a,b)中生成一个随机数。
发布于 2011-03-15 05:44:04
https://stackoverflow.com/questions/5307908
复制相似问题