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POChoose random String from two dimensional array?
 

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  1. POChoose random String from two dimensional array?
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    <p>So what I have is a 2d array with the name of the drink, and the price Test[Name][Price]:</p> <pre><code> public static final String[][] Test = {{"vodka1","5.0"},{"vodka2","10.0"},{"vodka3","15.0"},{"vodka4","20.0"},{"vodka5","25.0"}}; </code></pre> <p>What im trying to do is have it so that the user inputs their max price and then a drink is randomly chosen from the 2d array that is below their max price.</p> <p>So first of all how do i narrow down the array to just the drinks that are lower than the users max price?</p> <p>This is what i tried ( I know its wrong but its all i could think of):</p> <pre><code> private static final String[] test1 = {}; test1 = (array_city.Test[i][j] &lt;= Price); randomIndex = random.nextInt(test1.length); text2.setText(test1[randomIndex]); </code></pre> <p>Thanks!</p> <h1>EDIT</h1> <p>I have sorted my array into least to greatest according to prices and tried this code in order to find the greatest drink possible to buy, pick a random index somehwere between , and then setText to that string but when the activity page starts it crashes? Here is my code:</p> <pre><code> convert = Double.valueOf(array_city.Test[c][1]); // Set vodka brand while(Price &lt;= convert){ c++; convert = Double.valueOf(array_city.Test[c][1]); } final TextView text2 = (TextView) findViewById(R.id.display2); randomIndex = random.nextInt(c); text2.setText(array_city.Test[randomIndex][1]); </code></pre> <p>Why does this not work?</p> <h1>FINAL EDIT</h1> <p>Figured it out!! turned out to be some minor logic issues, changed to a four loop and it works great!! here is what i did to my code:</p> <pre><code> convert = Double.valueOf(array_city.Test[c][1]); // Set vodka brand for(double i = Price; i &gt;= convert;){ c++; convert = Double.valueOf(array_city.Test[c][1]); } final TextView text2 = (TextView) findViewById(R.id.display2); randomIndex = random.nextInt(c); </code></pre>
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    1. USHockeyman271
    1. USHockeyman271
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    1. COIs it a precondition that the array is sorted by price?
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      1. USeboix
    2. CO@eboix I guess i am confused on what exactly your asking?
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      1. USHockeyman271
    3. COhe's asking if the prices will always be in order in the array from smallest to largest `[1,2,3,4,5]` etc.. and not `[3,5,2,1,4]`.. if the array is always sorted, then you can just ignore the portion above/below the value.
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      1. USAustin Greco
 

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