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how to shuffle a 2D array in java correctly?
Yes. Create a list to represent a 2D array and then use Collections.shuffle(list).
Example
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Tester {
public static void main(String[] args) {
List<int[]> rows = new ArrayList<>();
rows.add(new int[]{1,2,3});
rows.add(new int[]{4,5,6});
rows.add(new int[]{7,8,9});
System.out.println("Before Shuffle");
System.out.println("[0][0] : " + rows.get(0)[0]);
System.out.println("[1][1] : " + rows.get(1)[1]);
System.out.println("After Shuffle");
Collections.shuffle(rows);
System.out.println("[0][0] : " + rows.get(0)[0]);
System.out.println("[1][1] : " + rows.get(1)[1]);
}
}Output
Before Shuffle [0][0] : 1 [1][1] : 5 After Shuffle [0][0] : 7 [1][1] : 2
Updated on: 24-Feb-2020
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