如何使用runtime.exec（）运行代码java另一个程序？

Question

我有一个程序使用runtime.exec（）来编译和运行代码java。我把代码需要用程序运行到不同的目录中。代码有方法从文件读取整数，所以当我运行程序编译并在目录中运行代码java然后有错误是找不到文件。 谁可以帮助我通过cmd运行代码java或使用runtime.exec（命令）执行代码java从文件中读取数据？

这是programe和代码java需要运行。

import java.io.*;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
public class TestCodeJava {
  private static void printLines(String name, InputStream ins) throws Exception {
    String line = null;
    BufferedReader in = new BufferedReader( new InputStreamReader(ins));
    while ((line = in.readLine()) != null) {
        System.out.println(name + " " + line);
   }
}
private static void runProcess(String command) throws Exception {
   Process pro = Runtime.getRuntime().exec(command);
   BufferedReader reader = new BufferedReader(new      InputStreamReader(pro.getInputStream()));
   pro.waitFor();
   String line = "";
  while((line = reader.readLine())!=null)
  {
       System.out.println(line);
  }
}
private static int toCompile(String fileToCompile)
{
  JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  int compilationResult = compiler.run(null,  null, null, "-verbose", fileToCompile);
  return compilationResult;
}
public static void main(String[] args) {
  try {
    if(toCompile("E:\\Folder\\Prime.java")==0)
    {
       runProcess("java -cp \"E:\\Folder\" Prime");
    }
  } catch (Exception e) {
    e.printStackTrace();
  }
}

}

import java.io.*;
public class Prime {
private static boolean isPrime(int n)
{
    if(n <= 1) return false;
    if(n == 2 || n == 3) return true;
    int m = (int) Math.sqrt(n);
    for(int i = 5; i <= m; i = i + 5)
        if(n % i == 0 || n % (i+2) == 0) return false;
    return true;
}
public static void main(String args[]) throws FileNotFoundException, IOException
{
    File file = new File("INPUT.TXT");
    FileInputStream fis = new FileInputStream(file);
    BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
    int n = Integer.parseInt(reader.readLine());
    File file2 = new File("OUTPUT.TXT");
    FileOutputStream fos = new FileOutputStream(file2);
    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fos));
    if(isPrime(n))
    {
        writer.write("YES");
    }else writer.write("NO");
    writer.flush();
    writer.close();
 }
}