Format code with prettier (#3375)

Author: acbin

src/main/java/com/thealgorithms/audiofilters/IIRFilter.java

@@ -22,7 +22,9 @@ public class IIRFilter {
      */
     public IIRFilter(int order) throws IllegalArgumentException {
         if (order < 1) {
-            throw new IllegalArgumentException("order must be greater than zero");
+            throw new IllegalArgumentException(
+                "order must be greater than zero"
+            );
         }
 
         this.order = order;
@@ -45,17 +47,24 @@ public IIRFilter(int order) throws IllegalArgumentException {
      * @throws IllegalArgumentException if {@code aCoeffs} or {@code bCoeffs} is
      * not of size {@code order}, or if {@code aCoeffs[0]} is 0.0
      */
-    public void setCoeffs(double[] aCoeffs, double[] bCoeffs) throws IllegalArgumentException {
+    public void setCoeffs(double[] aCoeffs, double[] bCoeffs)
+        throws IllegalArgumentException {
         if (aCoeffs.length != order) {
-            throw new IllegalArgumentException("aCoeffs must be of size " + order + ", got " + aCoeffs.length);
+            throw new IllegalArgumentException(
+                "aCoeffs must be of size " + order + ", got " + aCoeffs.length
+            );
         }
 
         if (aCoeffs[0] == 0.0) {
-            throw new IllegalArgumentException("aCoeffs.get(0) must not be zero");
+            throw new IllegalArgumentException(
+                "aCoeffs.get(0) must not be zero"
+            );
         }
 
         if (bCoeffs.length != order) {
-            throw new IllegalArgumentException("bCoeffs must be of size " + order + ", got " + bCoeffs.length);
+            throw new IllegalArgumentException(
+                "bCoeffs must be of size " + order + ", got " + bCoeffs.length
+            );
         }
 
         for (int i = 0; i <= order; i++) {
@@ -75,7 +84,8 @@ public double process(double sample) {
 
         // Process
         for (int i = 1; i <= order; i++) {
-            result += (coeffsB[i] * historyX[i - 1] - coeffsA[i] * historyY[i - 1]);
+            result +=
+                (coeffsB[i] * historyX[i - 1] - coeffsA[i] * historyY[i - 1]);
         }
         result = (result + coeffsB[0] * sample) / coeffsA[0];
 

src/main/java/com/thealgorithms/backtracking/Combination.java

@@ -7,7 +7,9 @@
  * @author Alan Piao (https://github.com/cpiao3)
  */
 public class Combination {
+
     private static int length;
+
     /**
      * Find all combinations of given array using backtracking
      * @param arr the array.
@@ -26,6 +28,7 @@ public static <T> List<TreeSet<T>> combination(T[] arr, int n) {
         backtracking(array, 0, new TreeSet<T>(), result);
         return result;
     }
+
     /**
      * Backtrack all possible combinations of a given array
      * @param arr the array.
@@ -34,7 +37,12 @@ public static <T> List<TreeSet<T>> combination(T[] arr, int n) {
      * @param result the list contains all combination.
      * @param <T> the type of elements in the array.
      */
-    private static <T> void backtracking(T[] arr, int index, TreeSet<T> currSet, List<TreeSet<T>> result) {
+    private static <T> void backtracking(
+        T[] arr,
+        int index,
+        TreeSet<T> currSet,
+        List<TreeSet<T>> result
+    ) {
         if (index + length - currSet.size() > arr.length) return;
         if (length - 1 == currSet.size()) {
             for (int i = index; i < arr.length; i++) {

src/main/java/com/thealgorithms/backtracking/FloodFill.java

@@ -13,27 +13,22 @@ public class FloodFill {
      * @param x The x co-ordinate of which color is to be obtained
      * @param y The y co-ordinate of which color is to be obtained
      */
-	
-	public static int getPixel(int[][] image, int x, int y) {
-	
-		return image[x][y];
-	
-	}
-	
+
+    public static int getPixel(int[][] image, int x, int y) {
+        return image[x][y];
+    }
+
     /**
      * Put the color at the given co-odrinates of a 2D image
      *
      * @param image The image to be filed
      * @param x The x co-ordinate at which color is to be filled
      * @param y The y co-ordinate at which color is to be filled
      */
-	public static void putPixel(int[][] image, int x, int y, int newColor) {
-		
-		image[x][y] = newColor;
-	
-	}
-	
-	
+    public static void putPixel(int[][] image, int x, int y, int newColor) {
+        image[x][y] = newColor;
+    }
+
     /**
      * Fill the 2D image with new color
      *
@@ -44,26 +39,29 @@ public static void putPixel(int[][] image, int x, int y, int newColor) {
      * @param oldColor The old color which is to be replaced in the image
      * @return
      */
-	public static void floodFill(int[][] image, int x, int y, int newColor, int oldColor) {
-
-		if(x < 0 || x >= image.length) return;
-		if(y < 0 || y >= image[x].length) return;
-		if(getPixel(image, x, y) != oldColor) return;
-
-		putPixel(image, x, y, newColor);
-
-		/* Recursively check for horizontally & vertically adjacent coordinates */
-		floodFill(image, x + 1, y, newColor, oldColor);
-		floodFill(image, x - 1, y, newColor, oldColor);
-		floodFill(image, x, y + 1, newColor, oldColor);
-		floodFill(image, x, y - 1, newColor, oldColor);
+    public static void floodFill(
+        int[][] image,
+        int x,
+        int y,
+        int newColor,
+        int oldColor
+    ) {
+        if (x < 0 || x >= image.length) return;
+        if (y < 0 || y >= image[x].length) return;
+        if (getPixel(image, x, y) != oldColor) return;
 
-		/* Recursively check for diagonally adjacent coordinates  */
-		floodFill(image, x + 1, y - 1, newColor, oldColor);
-		floodFill(image, x - 1, y + 1, newColor, oldColor);
-		floodFill(image, x + 1, y + 1, newColor, oldColor);
-		floodFill(image, x - 1, y - 1, newColor, oldColor);
+        putPixel(image, x, y, newColor);
 
-	}
+        /* Recursively check for horizontally & vertically adjacent coordinates */
+        floodFill(image, x + 1, y, newColor, oldColor);
+        floodFill(image, x - 1, y, newColor, oldColor);
+        floodFill(image, x, y + 1, newColor, oldColor);
+        floodFill(image, x, y - 1, newColor, oldColor);
 
-}
+        /* Recursively check for diagonally adjacent coordinates  */
+        floodFill(image, x + 1, y - 1, newColor, oldColor);
+        floodFill(image, x - 1, y + 1, newColor, oldColor);
+        floodFill(image, x + 1, y + 1, newColor, oldColor);
+        floodFill(image, x - 1, y - 1, newColor, oldColor);
+    }
+}

src/main/java/com/thealgorithms/backtracking/KnightsTour.java

@@ -25,10 +25,19 @@
  */
 public class KnightsTour {
 
-    private final static int base = 12;
-    private final static int[][] moves = {{1, -2}, {2, -1}, {2, 1}, {1, 2}, {-1, 2}, {-2, 1}, {-2, -1}, {-1, -2}}; // Possible moves by knight on chess
-    private static int[][] grid;    // chess grid
-    private static int total;   // total squares in chess
+    private static final int base = 12;
+    private static final int[][] moves = {
+        { 1, -2 },
+        { 2, -1 },
+        { 2, 1 },
+        { 1, 2 },
+        { -1, 2 },
+        { -2, 1 },
+        { -2, -1 },
+        { -1, -2 },
+    }; // Possible moves by knight on chess
+    private static int[][] grid; // chess grid
+    private static int total; // total squares in chess
 
     public static void main(String[] args) {
         grid = new int[base][base];
@@ -52,7 +61,6 @@ public static void main(String[] args) {
         } else {
             System.out.println("no result");
         }
-
     }
 
     // Return True when solvable
@@ -67,17 +75,23 @@ private static boolean solve(int row, int column, int count) {
             return false;
         }
 
-        Collections.sort(neighbor, new Comparator<int[]>() {
-            public int compare(int[] a, int[] b) {
-                return a[2] - b[2];
+        Collections.sort(
+            neighbor,
+            new Comparator<int[]>() {
+                public int compare(int[] a, int[] b) {
+                    return a[2] - b[2];
+                }
             }
-        });
+        );
 
         for (int[] nb : neighbor) {
             row = nb[0];
             column = nb[1];
             grid[row][column] = count;
-            if (!orphanDetected(count, row, column) && solve(row, column, count + 1)) {
+            if (
+                !orphanDetected(count, row, column) &&
+                solve(row, column, count + 1)
+            ) {
                 return true;
             }
             grid[row][column] = 0;
@@ -95,7 +109,7 @@ private static List<int[]> neighbors(int row, int column) {
             int y = m[1];
             if (grid[row + y][column + x] == 0) {
                 int num = countNeighbors(row + y, column + x);
-                neighbour.add(new int[]{row + y, column + x, num});
+                neighbour.add(new int[] { row + y, column + x, num });
             }
         }
         return neighbour;