C#調用命令

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

namespace Process_Test
...{
    class Process_Test
    ...{
        public static void Main()
        ...{
            Process a = new Process();
            a.StartInfo.CreateNoWindow = true;
            a.StartInfo.UseShellExecute = false;
            a.StartInfo.RedirectStandardOutput = true;
            a.StartInfo.FileName = @"java";
            a.StartInfo.Arguments = @" -help";
            a.Start();
            a.WaitForExit();
            string Str = a.StandardOutput.ReadToEnd();
            Console.WriteLine(Str);
        }
    }
}