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Added solution for Iterator-3d #36

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855c8df
Added 3DArray Iterator
HaskSy Nov 29, 2020
c2202b7
Added 3DArray Iterator
HaskSy Nov 29, 2020
466b1e5
Added working 3DArray Iterator
HaskSy Nov 29, 2020
f8cf898
Improving of Array3D iterator
HaskSy Nov 29, 2020
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74 changes: 74 additions & 0 deletions src/designpatterns/iterator/Array3D.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
package designpatterns.iterator;


import java.util.Iterator;
import java.util.NoSuchElementException;

public class Array3D<T> implements Iterator<T> {
private int index = 0;
private final T[][][] array3d;
private final int size;
private int matrix;
private int row;
private int col;

public Array3D(T[][][] array3d) {
this.array3d = array3d;
this.size = size(array3d);
this.matrix = 0;
this.row = 0;
this.col = 0;
}

private int prevMatrix;
private int prevRow;
private int prevCol;

private int size(T[][][] array3d) {
int counter = 0;
for (T[][] array2d: array3d) {
for (T[] array: array2d){
counter+=array.length;
}
}
return counter;
}

@Override
public boolean hasNext() {
return index < size;
}

@Override
public T next() {
if (index >= size) {
throw new NoSuchElementException();
}
T element = array3d[matrix][row][col];

prevCol = col;
prevRow = row;
prevMatrix = matrix;

index++;
col++;
if (col >= array3d[matrix][row].length) {
col = 0;
row++;
}
if (row >= array3d[matrix].length) {
row = 0;
matrix++;
}

if (element == null && this.hasNext()) {
return this.next();
}
return element;
}

@Override
public void remove() {
array3d[prevMatrix][prevRow][prevCol] = null;
}
}
17 changes: 17 additions & 0 deletions src/designpatterns/iterator/Main.java
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package designpatterns.iterator;

public class Main {

public static void main(String[] args) {
Integer[][][] Array3d = {
{{1, 2, 3, 4}, {1, 2, 3, 4}, {1, 2, 3, 4}, {null, null, null, null}},
{{9, 9, 9, 9}, {9, 9, 9, 9}, {9, 9, 9, 9}, {null, null, null, 8}},
{{8, 3, 5, 1}, {353, null}, {null, null, null, 12453}, {1, 2, 3, 4}}
};
Array3D<Integer> Iterable3dArray = new Array3D<>(Array3d);

while (Iterable3dArray.hasNext()) {
System.out.println(Iterable3dArray.next());
}
}
}