RotateMatrix.java

public class RotateMatrix {
static int R=3,C=3;
	public static void main(String[] args) {
		  int a[][] = {{1 ,2, 3},
				  	   {4, 5 ,6},
				  	   {7 ,8, 9}};
		  
		  rotatematrix(R, C, a);
	}
	private static void rotatematrix(int m, int n, int[][] mat) {
		int row=0,col=0;
		int prev=0,curr=0;
		while(row<m && col<n){
			if(row+1==m && col+1==n)
				break;
			 prev=mat[row+1][col];
			 
			 for(int i=col;i<n;i++){
				 curr=mat[row][i];
				 mat[row][i]=prev;
				 prev=curr;
			 }
			 row++;
			 for(int i=row;i<m;i++){
				 curr=mat[i][n-1];
				 mat[i][n-1]=prev;
				 prev=curr;
			 }
		
			 n--;
		
		if(row<m){
			 for(int i=n-1;i>=col;i--){
				 curr=mat[m-1][i];
				 mat[m-1][i]=prev;
				 prev=curr;
			 }
		} 
			 m--;
		
		if(col<n){
			 for(int i=m-1;i>=row;i--){
				 curr=mat[i][col];
				 mat[i][col]=prev;
				 prev=curr;
			 }
		}
			 col++;
	
		}
		for(int i=0;i<R;i++){
			for(int j=0;j<C;j++){
				System.out.print(mat[i][j]+" ");
			}
			System.out.println();
		}
		
	}

}