# How to sort 2d array in java

## How do you sort a 2d array?

Method 1: Convert the 2D array into 1D and then sort that 1D array.

1. Step 1: Input the 2D array of ‘m’ rows and ‘n’ columns.
2. Step 2: Print the original array.
3. Step 3: Create a 1D array of size ‘m*n’
4. Step 4: Save all elements of 2D array into 1D array (i.e. converting a 2D array into a 1D array)

## How do I sort a 2d array column wise?

Approach: Following are the steps:

1. Sort each row of the matrix.
2. Get transpose of the matrix.
3. Again sort each row of the matrix.
4. Again get transpose of the matrix.

## How do you sort an array in Java?

1. import java. util. Arrays;
2. public class Sorting {
3. public static void main (String [] args) {
4. int [] array = {45,12,85,32,89,39,69,44,42,1,6,8};
5. Arrays. sort(array, 4, 8);
6. System. out. println(“Partially Sorted: ” + Arrays. …
7. Arrays. sort(array);
8. System. out. println(“Completely Sorted: ” + Arrays.

## How do 2d arrays work in Java?

A 2D array has a type such as int[][] or String[][], with two pairs of square brackets. The elements of a 2D array are arranged in rows and columns, and the new operator for 2D arrays specifies both the number of rows and the number of columns. For example, int[][] A; A = new int[3][4];

## How do you sort an array?

Arrays class method.

1. Syntax:
2. We can also use sort() to sort a subarray of arr[]
3. We can also sort in descending order.
4. We can also sort strings in alphabetical order.
5. We can also sort an array according to user defined criteria. We use Comparator interface for this purpose. …
6. Arrays.sort() vs Collections.sort() Arrays.

## How do you sort a matrix?

We need to sort this given matrix in a strict order. Here strict order means that matrix is sorted in a way such that all elements in a row are sorted in ascending order and for row i, where 1 <=i<= n-1, first element of row ‘i’ is greater than or equal to the last element of row ‘i-1’.

## How do you sort a map by key?

Steps to sort HashMap by values

1. Get all entries by calling entrySet() method of Map.
2. Create a custom Comparator to sort entries based upon values.
3. Convert entry set to list.
4. Sort entry list by using Collections. sort() method by passing your value comparator.

## How do you code a bubble sort in Java?

Bubble Sort in Java

1. public class BubbleSortExample {
2. static void bubbleSort(int[] arr) {
3. int n = arr.length;
4. int temp = 0;
5. for(int i=0; i < n; i++){
6. for(int j=1; j < (n-i); j++){
7. if(arr[j-1] > arr[j]){
8. //swap elements.

## How do you sort a matrix in C++?

Algorithm

1. Declare a matrix of m rows and n column.
2. initialize the matrix with values/elements.
3. copy all the elements of a matrix to an array.
4. sort the array.
5. copy back the sorted elements of the array, back to the matrix.

## How do you reverse an array?

Step by step descriptive logic to reverse an array. Input size and elements in an array. Store it in some variable say size and arr respectively. Declare another array that will store reversed array elements of original array with same size, say reverse[size] .

## How do you sort a string array?

Method 1(natural sorting) :

1. Apply toCharArray() method on input string to create a char array for input string.
2. Use Arrays. sort(char c[]) method to sort char array.
3. Use String class constructor to create a sorted string from char array.