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POHow to compare one character from a string with another string
 

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  1. POHow to compare one character from a string with another string
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java">How do I compare strings in Java?</a> </p> </blockquote> <p>I'm fairly new to Java and to practice I'm trying to create a hexadecimal to decimal number converter since I've successfully managed to make a binary to decimal converter.</p> <p>The problem I'm having is basically comparing a given character of in a String with another string. This is how I define the current character that is to be compared:</p> <pre><code>String current = String.valueOf(hex.charAt(i)); </code></pre> <p>This is how I try to compare the character:</p> <pre><code>else if (current == "b") dec += 10 * (int)Math.pow(16, power); </code></pre> <p>When I try to run the code by entering just numbers e.g. 12, it works but when I try to use a 'b', I get a weird error. Here is the entire result of running the program:</p> <pre><code>run: Hello! Please enter a hexadecimal number. 2b For input string: "b" // this is the weird error I don't understand BUILD SUCCESSFUL (total time: 1 second) </code></pre> <p>Here is an example of successfully running the program with just a number conversion:</p> <pre><code>run: Hello! Please enter a hexadecimal number. 22 22 in decimal: 34 // works fine BUILD SUCCESSFUL (total time: 3 seconds) </code></pre> <p>Any help with this would be appreciated, thanks.</p> <p><strong>Edit:</strong> I think it will be useful if I put the entire method here.</p> <p><strong>Edit 2: SOLVED!</strong> I don't know who's answer that I should accept though because they were all so good and helpful. So conflicted. </p> <pre><code>for (int i = hex.length() - 1; i &gt;= 0; i--) { String lowercaseHex = hex.toLowerCase(); char currentChar = lowercaseHex.charAt(i); // if numbers, multiply them by 16^current power if (currentChar == '0' || currentChar == '1' || currentChar == '2' || currentChar == '3' || currentChar == '4' || currentChar == '5' || currentChar == '6' || currentChar == '7' || currentChar == '8' || currentChar == '9') // turn each number into a string then an integer, then multiply it by // 16 to the current power. dec += Integer.valueOf(String.valueOf((currentChar))) * (int)Math.pow(16, power); // check for letters and multiply their values by 16^current power else if (currentChar == 'a') dec += 10 * (int)Math.pow(16, power); else if (currentChar == 'b') dec += 11 * (int)Math.pow(16, power); else if (currentChar == 'c') dec += 12 * (int)Math.pow(16, power); else if (currentChar == 'd') dec += 13 * (int)Math.pow(16, power); else if (currentChar == 'e') dec += 14 * (int)Math.pow(16, power); else if (currentChar == 'f') dec += 15 * (int)Math.pow(16, power); else return 0; power++; // increment the power } return dec; // return decimal form } </code></pre>
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    1. COI think "Converting A String To Hexadecimal In Java" can be useful (http://stackoverflow.com/questions/923863/converting-a-string-to-hexadecimal-in-java)
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      1. POHow to compare one character from a string with another string
      1. USIgor K
    2. COHello @IgorK, I'm using another method to convert hexadecimal numbers to decimal.
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