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POTrouble handling input in Java
 

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  1. POTrouble handling input in Java
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    <p>I'm trying to read input from the terminal. For this, I'm using a BufferedReader. Here's my code.</p> <pre><code>BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String[] args; do { System.out.println(stateManager.currentState().toString()); System.out.print("&gt; "); args = reader.readLine().split(" "); // user inputs "Hello World" } while (args[0].equals("")); </code></pre> <p>Somewhere else in my code I have a <code>HashTable</code> where the Key and Values are both Strings. Here's the problem:</p> <p>If I want to get a value from the <code>HashTable</code> where the key I'm using to look up in the <code>HashTable</code> is one of the args elements. These args are weird. If the user enters two arguments (the first one is a command, the second is what the user wants to look up) I can't find a match.</p> <p>For example, if the HashTable contains the following values:</p> <pre><code>[ {"Hello":"World"}, {"One":"1"}, {"Two":"2"} ] </code></pre> <p>and the user enters:</p> <pre><code>get Hello </code></pre> <p>My code doesn't return <code>"World"</code>.</p> <p>So I used the debugger (using Eclipse) to see what's inside of <code>args</code>. I found that <code>args[1]</code> contains <code>"Hello"</code> but inside <code>args[1]</code> there is a field named <code>value</code> which has the value <code>['g','e','t',' ','H','e','l','l','o']</code>.</p> <p>The same goes for <code>args[0]</code>. It contains <code>"get"</code> but the field <code>value</code> contains <code>['g','e','t',' ','H','e','l','l','o']</code>!</p> <p>What the hell!!!</p> <p>However, if I check my <code>HashTable</code>, wherever the key is <code>"Hello"</code>, the value=<code>['H','e','l','l','o']</code>.</p> <p>Any ideas?</p> <p>Thank you very much.</p> <hr> <p>EDIT:</p> <p>Here's come code sample. The same is still happening.</p> <pre><code>import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Hashtable; public class InputTest { public static void main(String[] args) { BufferedReader reader = new BufferedReader(new InputStreamReader( System.in)); Hashtable&lt;String, String&gt; EngToSpa = new Hashtable&lt;String, String&gt;(); // Adding some elements to the Eng-Spa dictionary EngToSpa.put("Hello", "Hola"); EngToSpa.put("Science", "Ciencia"); EngToSpa.put("Red", "Rojo"); // Reads input. We are interested in everything after the first argument do { System.out.print("&gt; "); try { args = reader.readLine().trim().split("\\s"); } catch (IOException e) { e.printStackTrace(); } } while (args[0].equals("") || args.length &lt; 2); // ^ We don't want empty input or less than 2 args. // Lets go get something in the dictionary System.out.println("Testing arguments"); if (!EngToSpa.contains(args[1])) System.out.println("Word not found!"); else System.out.println(EngToSpa.get(args[1])); // Now we are testing the word "Hello" directly System.out.println("Testing 'Hello'"); if (!EngToSpa.contains("Hello")) System.out.println("Word not found!"); else System.out.println(EngToSpa.get("Hello")); } } </code></pre> <p>The same is still happening. I must be misunderstanding Hash Tables. Ideas where things are going wrong?</p>
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    1. USSparragus
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    1. COSince your problem is putting and getting entries in a hash table, post that code. The relevance of the code provide is not clear.
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      1. USerickson
 

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