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POHandling Error Inputs
 

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  1. POHandling Error Inputs
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    <p>Here I'm trying to retrieve values and keys from the Hash map depending upon the user input.</p> <p>Here I've asked the user to input values from the key board. And later depending upon the users input I retrieve either Value or Key from the Hash Map.</p> <p>As of now it's working fine. But I want to handle the error conditions.</p> <p>E.g:</p> <ol> <li>What if user give other than M/N or Q in the 1st System.out.println() statement.</li> <li>What if user invalid Main Number and so on.</li> </ol> <p>Like this I want to handle all possible error conditions after asking the user for input in the System.out.println() statement.</p> <p>/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package cricketpur;</p> <pre><code> import java.lang.*; import java.util.*; import java.io.*; public class Main { public static void main(String[] args) { // TODO code application logic here HashMap&lt;String, String&gt; streetno = new HashMap&lt;String, String&gt;(); streetno.put("1", "Sachin Tendulkar"); streetno.put("2", "Dravid"); streetno.put("3", "Sehwag"); streetno.put("4", "Laxman"); streetno.put("5", "Kohli"); Scanner s = new Scanner(System.in); String a; String inp; for (;;) { System.out.println("Enter M/N and Q to quit:"); a = s.nextLine(); if ((a == null ? "M" == null : a.equals("M")) || a.equals("m")) { System.out.println("Enter the Main number:"); inp = s.nextLine(); } else if ((a == null ? "Q" == null : a.equals("Q")) || a.equals("q")) { break; } else { System.out.println("Enter the Street name:"); inp = s.nextLine(); } for (Map.Entry&lt;String, String&gt; entry : streetno.entrySet()) { if (inp.equals(entry.getKey())) { System.out.println(entry.getValue()); break; } else if (inp.equals(entry.getValue())) { System.out.println(entry.getKey()); break; } } } } } </code></pre>
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USKiran Bhat
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    2. PO
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    1. This table or related slice is empty.
    1. COOut of interest, what is this supposed to do: `(a == null ? "M" == null : a.equals("M")) || a.equals("m")`?
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      1. POHandling Error Inputs
      1. USNPE
    2. COThis condition just checks whether if it is capital M or small m.. That's it.. If any of one condition is satisfied it enters inside the if condition..
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      1. POHandling Error Inputs
      1. USKiran Bhat
 

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