java - 如何在java中引用外部文件的关键字

Question

我还在学习java，所以请耐心等待。我有一个程序，如果你在其中输入一个关键字，它就会运行一个方法和东西。我想做的是创建一个可以随时学习的过程，即外部命令列表，当输入该命令时，它将像原始关键字一样运行。

这可能没有多大意义，所以这是我想要发生的事情的示例:

程序启动，我输入关键字 1(为了便于论证，我们可以说删除)，它运行该方法。 现在我想输入“删除”这样的关键字，它的作用应该与“删除”相同。由于代码中尚未包含“删除”，因此我输入了类似于“新命令:删除运行删除”或类似内容的内容。在外部文件中，它会生成一行或类似“删除=删除”之类的内容。现在，当我输入“删除”时，它会检查列表文件，并发现“删除”与“删除”相同。

抱歉，如果这没有多大意义。

就像我说的，我仍然处于 java 的学习过程中，所以任何解释方面的帮助都会很棒!

Answer 1

编辑 我很确定这几乎正是你想要的，我把它美化了，因为我对上次的错误感到很难过。这个甚至写出了用户输入的新命令。我错过了什么？

import java.io.*;
import java.util.ArrayList;

public class test {

  public static void main (String[] args) {
    test t = new test();
    t.test();
  }

  /** A test method for our code **/
  public void test(){
    String[] command = new String[2];

      BufferedReader commands = null;

      //initialize list of commands
      ArrayList<String[]> commandList = new ArrayList<String[]>();

      //Get a list of Commands from a file
      this.getCommands( commandList );

      //get the next command
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Next Thing?\n");
      this.getCommand( br, command, commandList );
      if ( command[1] == null ){
        System.out.print("New command?\n");
        commandList.add( this.makeCommand( br, command ) );
      }
      else{
        //Not sure what you want to do here, this is if the method IS found
        System.out.println( "We found: "+command[1]);
      }

      this.save(commandList);  
  }

  /**Returns the old list of commands**/
  public void getCommands( ArrayList<String[]> commandList ){
    BufferedReader commands;
    try{
      String sCurrentLine;

      commands = new BufferedReader(new FileReader("testing.txt"));

      while ((sCurrentLine = commands.readLine()) != null) {
        commandList.add( sCurrentLine.split(":") );
      }

    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  /**
  Asks the user for a command and checks it against known commands. It's not a 
  very efficient algorithm, but effective. 
  **/
  public void getCommand( BufferedReader br, String[] command, 
                          ArrayList<String[]> commandList ){

    try {
      command[0] = br.readLine();
      for ( String[] com : commandList ){
        if (com[0].equals( command[0] )){
          command[1] = com[1];
        }
      }
    } 
    catch (IOException ioe) 
      {
       System.out.println("IO error trying to read your commnad!");
      }
  }

  /** Makes a new command, to be used when one isn't known **/
  public String[] makeCommand( BufferedReader br, String[] command ){
    try{
      command[1] = br.readLine();
    }
    catch( IOException ioe)
      {
        System.out.println("Oh no!!!");
      }
      return command;
  }

  /** Saves your stuff **/
  public void save( ArrayList<String[]> commandList){
    try{
      PrintWriter writer = new PrintWriter( "testing.txt","UTF-8" );
      for ( String[] com : commandList ){
        writer.println( com[0]+":"+com[1] );
      }
      writer.close();
    }
    catch( Exception ioe ){
      System.out.println("You're in trouble");
    }
  }


}