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:

Output:

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