program to Print Diamond pattern in java

/*
To Print Diamond pattern
for n=4
    *
  * *
 * * *
* * * *
 * * *
  * *
   *
*/




import java.io.*;


class Pattern
{
public static void main(String args[]) throws IOException
{

BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

System.out.println("ENTER THE NO OF ROWS TO PRINT PATTERN");
int m = Integer.parseInt(input.readLine());
int n=m+(m-1);

for(int i=1;i<=n;i++)
{
for(int j=1;j<=(n-i);j++)
{
System.out.print(" ");
}
for(int k=1;k<=i;k++)
{
System.out.print("* ");
}
System.out.println();
}


for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(" ");
}
for(int k=1;k<=(n-i);k++)
{
System.out.print("* ");
}
System.out.println();
}

}
}