pat.java

// Java Program to print pattern 
// Palindrome triangle 
import java.util.*; 

public class GeeksForGeeks { 
	// Function to demonstrate pattern 
	public static void printPattern(int n) 
	{ 
		int i, j; 

		// outer loop to handle number of rows 
		for (i = 1; i <= n; i++) { 
			// inner loop to print the spaces 
			for (j = 1; j <= 2 * (n - i); j++) { 
				System.out.print(" "); 
			} 

			// inner loop to print the first part 
			for (j = i; j >= 1; j--) { 
				System.out.print(j + " "); 
			} 

			// inner loop to print the second part 
			for (j = 2; j <= i; j++) { 
				System.out.print(j + " "); 
			} 

			// printing new line for each row 
			System.out.println(); 
		} 
	} 

	// Driver Function 
	public static void main(String args[]) 
	{ 
		int n = 6; 
		printPattern(n); 
	} 
}