Java program to print the following pattern on the console

12344321
123**321
12****21
1******1

Algorithm:

STEP 1: START
STEP 2: SET lines=4
STEP 3: DEFINE i, j.
STEP 4: SET space=0
STEP 5: SET i=0
STEP 6: REPEAT STEP 7 TO 20 UNTIL i
STEP 7: SET j=1
STEP 8: REPEAT STEP 9 UNTIL j <= space.
STEP 9: PRINT " " and SET J=J+1
STEP 10: SET j=1
STEP 11: REPEAT STEP 12 and 13 UNTIL j<=lines
STEP 12: IF j <=(lines-i). PRINT j ELSE PRINT *
STEP 13: SET j=j+1
STEP 14: DECREMENT j by 1
STEP 15: REPEAT STEP 16 and 17 UNTIL j>0
STEP 16: IF j>( lines-i ) then PRINT * ELSE PRINT j
STEP 17: SET j=j-1
STEP 18: IF (lines-i) >9 INCREMENT space by 1
STEP 19: PRINT new line
STEP 20: SET i=i+1
STEP 21: END

Program:

 public class pattern
 {
     public static void main(String[] args) {
     int lines=4;
     int i,j;
     int space=0;
     for(i=0;i<lines;i++){// this loop is used to print lines
         for(j=1;j<=space;j++){// this loop is used to print space in a line
             System.out.print(" ");
         }
         for(j=1;j<=lines;j++){// this loop is used to print numbers in a line
             if(j<=(lines-i))
             System.out.print(j);
             else
             System.out.print("*");
         }
         j--;
         while(j>0){// this loop is used to print numbers in a line
             if(j>lines-i)
             System.out.print("*");
             else
             System.out.print(j);
             j--;
         }
         if((lines-i)>9)// this loop is used to increment space
         space=space+1;
     System.out.println("");
     }
 }
}

Output: