Hi Friend

import java.io.*;
import java.io.BufferedReader;

public class PrintDiamond{
public static final void main(String[] args) throws IOException{
BufferedReader read = new BufferedReader( new InputStreamReader(System.in));
System.out.print("Enter the numerical Numebr:");
String str= read.readLine();
int n = Integer.parseInt(str);
for ( int i = 1; i <= n; i += 2 ){
for(int k = 0; k < ( n - i ); k += 2)
System.out.print(" ");
for(int j = 0; j < (( i * 2 ) - 1 ); j += 2)
System.out.print(" *");
System.out.println(" ");
}
for(int i = 1; i <= n; i += 2){
for(int k = 1; k < i; k += 2)
System.out.print(" ");
for(int j = 0; j <= (n - i); j++)
System.out.print(" *");
System.out.println(" ");
}
}
}