How to transpose an array in Java?

The below code will help you to convert rows into columns and columns in to rows.



public class Transposing {


static int TArray[][]= {{1,2,3},{4,5,6},{7,8,9}};


public static int[][] transpose(int[][] arr)
{
if (arr==null||arr.length==0) {
return arr;}

int Rows=arr.length;
int Cols=arr[0].length;

int [][] arr_new=new int[Cols][Rows];

for(int x=0;x<Rows;x++)
{
for(int y=0;y<Cols;y++)
{
arr_new[y][x]=arr[x][y];
}
}
return arr_new;

}
public static void main(String[] args)
{


// TODO Auto-generated method stub
int i,j;

System.out.println("Before Transponse");

for(i=0;i<TArray.length;i++)
{
for(j=0;j<TArray[0].length;j++)
{
System.out.print(TArray[i][j]+"  ");
}
System.out.println();
}

System.out.println("After Transpose");
TArray=transpose(TArray);
for(i=0;i<TArray.length;i++)
{
for(j=0;j<TArray[0].length;j++)
{
System.out.print(TArray[i][j]+"  ");
}
System.out.println();
}
}

}

OUTPUT

Before Transponse

1  2  3  

4  5  6  

7  8  9  

After Transpose

1  4  7  

2  5  8  

3  6  9