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POChecking if array is subset of other array. Java
 

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  1. POChecking if array is subset of other array. Java
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    <p>I have to make an array of 100 numbers and then shuffle the first 20 randomly to have 2 different arrays; A and B.</p> <p>For this assignment I have to check wether the first 20 numbers from Array A are a subset of the first 20 numbers af Array B</p> <p>Up until now I have this:</p> <pre><code>import java.util.Random; public class opgave6 { public static void main(String[] args){ Verzameling a = new Verzameling(20, 3); Verzameling b = new Verzameling(20, 4); System.out.println(Verzameling.deelverzamelingVan()); } } class Verzameling { int[] elementen; int elementen2; static int aantal2; Verzameling(int aantal , int seed) { elementen = new int[100]; int aantal2 = aantal; for(int i = 0; i &lt; 100; i++){ elementen[i] = i; } Random random1 = new Random(seed); for(int i = 0; i &lt; 100; i++){ int r = random1.nextInt(100); int temp; temp = elementen[i]; elementen[i] = elementen[r]; elementen[r] = temp; } printVerzameling(aantal); } Verzameling(int seed) { } void printVerzameling(int aantal){ for (int i = 0; i &lt; aantal; i++){ System.out.print(elementen[i] + " "); } System.out.println(); } static boolean deelverzamelingVan() { while (true) { for(i = 0; i &lt; aantal2; i++){ for(j = 0; j &lt; aantal2; j++){ if(Verzameling.a.elementen[i] = Verzameling.b.elementen[j]) break; } } } } } </code></pre> <p>However, it doesnt work at all because I cannot figure out how to compare the elementen[i] from object A to element[j] from object B. How can i compare the different elements from both objects by using the static method in the same class.</p> <p>(So Verzameling A and B are both instances of the Verzameling class, with a static method to check if A is subset of B. How can I get the numbers in the array from Verzameling A and B?)</p> <p>If something is not clear please let me know! I don't need whole solutions, just how I can access the value of elementen[i] from object A and B. thanks!</p> <p>EDIT:</p> <p>this is the problem line:</p> <p>if(Verzameling.a.elementen[i] == Verzameling.b.elementen[j])</p> <p>thanks for the comment, however it is still erroring when i compile. It says it cannot find symbol about verzameling.a.elementen, i, verzameling.b.elementen and j. I think i am naming it wrong, is it ok to call the variable by saying: classname.objectname.variable of object? </p>
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    1. COthanks @ hvgotcodes for the layout edit, I never seem to get it to work? how do you do it?
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    2. CODid you copy and paste this code? Or type it in SO? You shouldn't have a single `=`; it shuld be `==`. But then, it wouldn't compile, so that probably doesn't help you.
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    3. CO@javaa, i used the code formatting icon in the editor -- its a bunch of 1s and 0s.
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