帮忙改错,给分!!!急!!!

Question

不 好意思,以下是错误提示:
[root@localhost os]# javac shell.java
shell.java:17: ';' expected
                        StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT")
                                                                                                        ^
shell.java:29: illegal start of expression
                throws IOException{
                ^
shell.java:51: ')' expected
                }catch(Interrupted Exception e){
                                             ^
shell.java:53: '{' expected
                }
                 ^
shell.java:57: '}' expected
}
 ^
shell.java:13: cannot resolve symbol
symbol  : method Command  (java.lang.String)
location: class shell.Command
                        Process p=r.exec(Command(CommandLine));
                                         ^
shell.java:15: cannot resolve symbol
symbol  : class StreamGobbler
location: class shell.Command
                        StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
                        ^
shell.java:15: cannot resolve symbol
symbol  : class StreamGobbler
location: class shell.Command
                        StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
                                                         ^
shell.java:15: cannot resolve symbol
symbol  : variable proc
location: class shell.Command
                        StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
                                                                       ^
shell.java:17: cannot resolve symbol
symbol  : class StreamGobbler
location: class shell.Command
                        StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT")
                        ^
shell.java:17: cannot resolve symbol
symbol  : class StreamGobbler
location: class shell.Command
                        StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT")
                                                          ^
shell.java:17: cannot resolve symbol
symbol  : variable proc
location: class shell.Command
                        StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT")
                                                                        ^
shell.java:35: cannot resolve symbol
symbol  : variable tokens
location: class shell
                while (tokens.hasMoreTokens())
                       ^
shell.java:37: cannot resolve symbol
symbol  : variable tokens
location: class shell
                        str[count]=new String(tokens.nextToken());
                                              ^
shell.java:41: cannot resolve symbol
symbol  : variable numberOfCommands
location: class shell
                Thread t[] = new Thread[numberOfCommands];
                                        ^
shell.java:42: cannot resolve symbol
symbol  : variable numberOfCommands
location: class shell
                for (int i=0; i<numberOfCommands; i++) {
                                ^
shell.java:44: non-static variable this cannot be referenced from a static context
                        t[i] = new Thread(new Command(str[i]));
                                          ^
shell.java:48: cannot resolve symbol
symbol  : variable numberOfCommands
location: class shell
                        for (int i=0; i<numberOfCommands; i++) {
                                        ^
shell.java:51: cannot resolve symbol
symbol  : class Interrupted
location: class shell
                }catch(Interrupted Exception e){
                       ^
19 errors

Answer 1

你的错误太多了
好好检查一下程序
我刚才看了一下
有忘了加；的  StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT")
；
还有e.printStack Trace();改为e.printStackTrace();
Interrupted Exception e  改为InterruptedException e 剩下的好像整个程序我建议你还是重写一下啊 呵呵

Answer 2

numberOfCommands-->NumberOfCommands 注意大小写

Answer 3

以上的问题都跟正过了 ,还有5个错误,
[root@localhost os]# javac shell.java
shell.java:29: illegal start of expression
                throws IOException{
                ^
shell.java:13: cannot resolve symbol
symbol  : method Command  (java.lang.String)
location: class shell.Command
                        Process p=r.exec(Command(CommandLine));
                                         ^
shell.java:35: cannot resolve symbol
symbol  : variable tokens
location: class shell
                while (tokens.hasMoreTokens())
                       ^
shell.java:37: cannot resolve symbol
symbol  : variable tokens
location: class shell
                        str[count]=new String(tokens.nextToken());
                                              ^
shell.java:44: non-static variable this cannot be referenced from a static context
                        t[i] = new Thread(new Command(str[i]));
                                          ^
5 errors

Answer 4

搂主：要是想学java,一步一步来呀，你一下就从这开始，
而且有的错误......，建议还是从HelloWord开始吧：）给你弄出个编译过了的，要实现什么功能慢慢添吧。public class Shell
{
        class Command implements Runnable{
                String CommandLine;
                Command(String CommandLine){
                        this.CommandLine=CommandLine;
                }
                public void run(){
                  try{
                        Runtime r=Runtime.getRuntime();
                        Process p=r.exec(CommandLine);
                  }catch(Exception ex){ex.printStackTrace();}
                        // any error message?
//                        StreamGobbler errorGobbler = new StreamGobbler(p.getErrorStream(), "ERROR");
                        // any output?
//                        StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");
                        //
                }
        }
        public static void main(String arg[])
        {
          Shell a=new Shell();
          a.test();
        }
        public void test(){
          System.out.println("Command: ");
          System.out.flush();
          String str[];
          str=new String[32];
          int count=0;
          int numberOfCommands=0;
          String s="";
          //throws IOException{
          try{
          BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
          s=in.readLine();
          }catch(Exception e){e.printStackTrace();}
          //      }
          StringTokenizer tokens = new StringTokenizer(s, " &");
          while (tokens.hasMoreTokens())
          {
            str[count]=new String(tokens.nextToken());
            count++;
          }
          numberOfCommands=count-1;
          Thread t[] = new Thread[numberOfCommands];
          for (int i=0; i<numberOfCommands; i++) {
            t[i] = new Thread(new Command(str[i]));
            t[i].start();
          }
          try{
            for (int i=0; i<numberOfCommands; i++) {
              t[i].join();
            }
          }catch(InterruptedException e){
            e.printStackTrace();
          }
        }
}

Answer 5

用了 啊!
 try{
for (int i=0; i<numberOfCommands; i++) {
t[i].join();
}
}catch(Interrupted Exception e){
e.printStackTrace();
应该也只有join()方法会抛出错误吧?

Answer 6

把你的tokens和s的定义提到外面来

Answer 7

//实现一个简单的shell,当在提示符下键入命令,程序将创建一个线程来执行,在同一行可以
//输入多个命令,每个命令由"&"号分隔,程序同时执行这些命令,执行完毕后提示输入信息.
//以下是小弟的代码:import java.util.*;
import java.io.*;public class TestShell
{
    class Command
        implements Runnable
    {
        String CommandLine;
        Command(String CommandLine)
        {
            this.CommandLine = CommandLine;
        }        public void run()
        {
            try
            {
                System.out.println(CommandLine);
                Runtime r = Runtime.getRuntime();
                Process proc = r.exec(CommandLine.trim());
                java.io.BufferedReader in
                 = new java.io.BufferedReader(new java.io.InputStreamReader( proc.getInputStream()));
                String s=null;
                while ( (s=in.readLine())!=null)
                {
                    System.out.println(s);
                }
                in.close();            }catch(Exception ex)
            {
                ex.printStackTrace();
            }
        }
    }    public static void main(String arg[]) throws IOException
    {
        System.out.println("Command: ");
        System.out.flush();
        String str[];
        str = new String[32];
        int count = 0;
        int numberOfCommands = 0;            BufferedReader in = new BufferedReader(new InputStreamReader(System.
                in));
            String s;
            s = in.readLine();
        StringTokenizer tokens = new StringTokenizer(s, "&");
        while (tokens.hasMoreTokens())
        {
            str[count] = new String(tokens.nextToken());
            count++;
        }
        System.out.println(count);
        numberOfCommands = count ;
        Thread t[] = new Thread[numberOfCommands];
        for (int i = 0; i < numberOfCommands; i++)
        {
            t[i] = new Thread(new TestShell().new Command(str[i]));
            t[i].start();
        }
    }
}

Answer 8

你可能是用notepad之类的简单编辑器吧!这么多错误的话，你应该用jbuilder，它会提示你的。我觉得集成开发环境会帮你提示错误。

Answer 9

catch(Interrupted Exception e)在Interrupted和Exception之间多空格了