Pattern.java

import java.util.*;
import java.lang.*;
import java.io.*;

class Pattern
{
	public static void main (String[] args) throws java.lang.Exception
	{
		boolean switchChar = false, reachedHeight = false;
		int height = 9, noOfSpaces = (height - 1)/2, noOfChars = 1, i, j = 0;
		char character1 = '@', character2 = '|';
		
		for(i = 0; i < height; i++){
		    if(switchChar){
		        System.out.print(character1 + "\t");
		        switchChar = false;
		    }
		    else{
		        System.out.print(character2 + "\t");
		        switchChar = true;
		    }
		}
		System.out.println();
		
		for(i = 0;i < height;i++)
		    System.out.print(character1 + "\t");
		System.out.println();
		
		for(i = 0;i < height;i++){
		    
		    if(!reachedHeight){
		        for(j = 0;j < noOfSpaces;j++)
		            System.out.print(" " + "\t");
		        for(j = 0;j < noOfChars;j++)
		            System.out.print(character1 + "\t");
		        for(j = 0;j < noOfSpaces;j++)
		            System.out.print(" " + "\t");
		        if(noOfChars != height){
		            noOfChars += 2;
		            --noOfSpaces;
		        }else{
		            reachedHeight = true;
		            ++noOfSpaces;
		            noOfChars -= 2;
		        }
		    }else{
		        for(j = 0;j < noOfSpaces;j++)
		            System.out.print(" " + "\t");
		        for(j = 0;j < noOfChars;j++)
		            System.out.print(character1 + "\t");
		        for(j = 0;j < noOfSpaces;j++)
		            System.out.print(" " + "\t");
		            ++noOfSpaces;
		            noOfChars -= 2;
		    }
	    System.out.println(); 
		}
		
		for(i = 0;i < height;i++)
		    System.out.print(character1 + "\t");
		System.out.println();
		
			for(i = 0;i < height;i++){
		    if(switchChar){
		        System.out.print(character2 + "\t");
		        switchChar = false;
		    }
		    else{
		        System.out.print(character1 + "\t");
		        switchChar = true;
		    }
		}
	}
}