📘 Java Arrays Class Cheat Sheet

Category	Method	Args	Description	Example
🔽 Sorting	`sort(array)`	1	Sorts entire array	`Arrays.sort(nums);`
	`sort(array, from, to)`	3	Sorts a subrange of the array	`Arrays.sort(nums, 1, 4);`
	`parallelSort(array)`	1	Sorts array using multiple threads	`Arrays.parallelSort(nums);`
	`parallelSort(array, from, to)`	3	Parallel sort within a range	`Arrays.parallelSort(nums, 1, 4);`
🔍 Searching	`binarySearch(array, key)`	2	Searches in sorted array	`Arrays.binarySearch(nums, 5);`
🔍 Searching	`binarySearch(array, from, to, key)`	4	Searches in a range	`Arrays.binarySearch(nums, 1, 4, 5);`
🎭 Comparing	`equals(array1, array2)`	2	Checks if arrays are equal	`Arrays.equals(a, b);`
	`deepEquals(array1, array2)`	2	Deep compare for multi-dim arrays	`Arrays.deepEquals(grid1, grid2);`
	`compare(array1, array2)`	2	Lexicographically compares arrays	`Arrays.compare(a, b);`
	`mismatch(array1, array2)`	2	Returns first mismatch index	`Arrays.mismatch(a, b);`
🧬 Copying / Filling	`copyOf(original, newLength)`	2	Copies array to new length	`Arrays.copyOf(nums, 10);`
	`copyOfRange(original, from, to)`	3	Copies a subrange	`Arrays.copyOfRange(nums, 1, 4);`
	`fill(array, value)`	2	Fills entire array	`Arrays.fill(nums, 0);`
	`fill(array, from, to, value)`	4	Fills part of array	`Arrays.fill(nums, 1, 4, 7);`
	`setAll(array, generator)`	2	Sets values using lambda	`Arrays.setAll(nums, i -> i * i);`
	`parallelSetAll(array, generator)`	2	Parallel version of setAll	`Arrays.parallelSetAll(nums, i -> i + 1);`
📦 Conversion	`asList(array...)`	Varargs	Converts array to List	`Arrays.asList("a", "b");`
	`toString(array)`	1	String form of 1D array	`Arrays.toString(nums);`
	`deepToString(array)`	1	String form of multi-dim array	`Arrays.deepToString(matrix);`
	`hashCode(array)`	1	Hash code of array	`Arrays.hashCode(nums);`
	`deepHashCode(array)`	1	Hash for multi-dim array	`Arrays.deepHashCode(grid);`
	`stream(array)`	1	Creates a stream from array	`Arrays.stream(nums).sum();`
	`spliterator(array)`	1	Returns Spliterator	`Arrays.spliterator(nums);`