Rotate Matrix

class Solution{
    public void rotate(int[][] matrix){
        for(int i = 0; i<matrix.length; i++){
            for(int j = i; j<matrix[0].length; j++){
                int temp =0;
                temp = matrix[i][j];
                matrix[i][j] = matrix[j][i];
                matrix[j][i] = temp;
            }
        } 

        for(int i =0; i<matrix.length; i++){
            for(int j =0; j<matrix.length/2; j++){
                int temp = 0;
                temp = matrix[i][j];
                matrix[i][j] = matrix[i][matrix.length -1 - j];
                matrix[i][matrix.length - 1 -j] = temp;
            }
        }
    }
}

class Solution {
    public void rotate(int[][] matrix) {
         int n = matrix.length;
        for (int i = 0; i < (n + 1) / 2; i ++) {
            for (int j = 0; j < n / 2; j++) {
                int temp = matrix[n - 1 - j][i];
                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - j - 1];
                matrix[n - 1 - i][n - j - 1] = matrix[j][n - 1 -i];
                matrix[j][n - 1 - i] = matrix[i][j];
                matrix[i][j] = temp;
            }
        }
    }
}













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import java.util.* ;
import java.io.*; 
import java.util.* ;
import java.io.*; 
import java.util.ArrayList;

public class Solution {
    public static void rotateMatrix(ArrayList<ArrayList<Integer>> mat, int n, int m) {
        // Write your code here.
        int t=0,l=0,b=n-1,r=m-1;               
         while(t<b && l<r)// to iterate for all elements until it reaches center    
         {   
            for(int i=t;i<b;i++) // top to bottom  
            swap(mat  ,i,l  ,i+1,l);      
            for(int i=l;i<r;i++) // left to right   
            swap(mat  ,b,i  ,b,i+1);   
            for(int i=b;i>t;i--) // bottom to top     
            swap(mat  ,i,r  ,i-1,r);        
            for(int i=r;i>l+1;i--) // right to left + 1    to avoid 1st element which was swapped earlier during top - bottom           
            swap(mat  ,t,i  ,t,i-1);                              
            l++;t++;r--;b--;// to itarate for internal e;ements   
          
                                                               
        }  
        static void swap(ArrayList<ArrayList<Integer>> mat,Integer i1,Integer j1 ,Integer i2,Integer j2){ 
                   Integer t=mat.get(i1).get(j1);     
                      mat.get(i1).set(j1 , mat.get(i2).get(j2) );  
                            mat.get(i2).set(j2 , t);
                            

   //wasn't sure if I should take int or Integer so I took Integer as variable;        } }  
    }
}