├── patterns.java
├── right_pascal_triangle.java
├── square_hollow_.java
└── squarefillpattern.java


/patterns.java:
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 1 | import java.util.*;
 2 | public class patterns {
 3 |     public static void main(String[] args) {
 4 |         Scanner in = new Scanner(System.in);
 5 |         System.out.print("Enter the number : ");
 6 |         int n=in.nextInt();
 7 |         // pattern1(n);
 8 |         // pattern2(n);
 9 |         // pattern3(n);
10 |         //pattern4(n);
11 |         //pattern5(n);
12 |         pattern6(n);
13 |     }
14 |     static void pattern1 (int n){
15 |         c
16 |     }
17 |     static void pattern2 (int n){
18 |         System.out.println("Square fill pramid \n");
19 |         for (int i = 1; i <= n; i++) {
20 |             //   row element = column element
21 |             for (int j = 1; j <= n; j++) {
22 |                 System.out.print(" * ");
23 |             }
24 |             System.out.println();
25 |         }
26 |     }
27 | 
28 |     static void pattern3 (int n){/////////// it contains n - i + 1
29 |         System.out.println("Reverse right half pramid \n");
30 |         for (int i = 1; i <= n; i++) {
31 |             //   row element = column element
32 |             for (int j = 1; j <= n-i+1; j++) {     /// n - i + 1
33 |                 System.out.print(" * ");
34 |             }
35 |             System.out.println();
36 |         }
37 |     }
38 |     static void pattern4 (int n){
39 |         System.out.println("number increasing  pramid \n");
40 |         for (int i = 1; i <= n; i++) {
41 |             //   row element = column element    // j=1
42 |             for (int j = 1; j <= i; j++) {
43 |                 System.out.print(j+" ");
44 |             }
45 |             System.out.println();
46 |         }
47 |     }
48 |     static void pattern5 (int n){
49 |         System.out.println("Right pascal triangle \n");
50 |         for (int i = 1; i <= 2 * n; i++) {      //        i  =  2 * n
51 |             //
52 |             int space= i > n ? 2 * n - i  : i;  //      space = i > n ? 2 * n - i : i
53 | 
54 |             for (int j = 1; j <= space; j++) {   //     j  = 2 * n - 1
55 |                 System.out.print(" * ");
56 |             }
57 |             System.out.println();
58 |         }
59 |     }
60 |     static void pattern6 (int n){
61 |         System.out.println("Right pascal triangle \n");
62 |         for (int i = 1; i <= 2 * n - 1 ; i++) {
63 |             int colrow = i > n ? 2 * n - i : i;
64 | 
65 |             int space= n - colrow;
66 |             for(int s=0;s<space;s++)
67 |             {
68 |                 System.out.print(" ");
69 |             }
70 |             for (int j = 1; j <= colrow; j++) {   //     j  = 2 * n - 1
71 |                 System.out.print("* ");
72 |             }
73 |             System.out.println();
74 |         }
75 |     }
76 | }
77 | 


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/right_pascal_triangle.java:
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 1 | package patterns;
 2 | import java.util.*;
 3 | public class right_pascal_triangle {
 4 |     public static void main(String[] args) {
 5 |         Scanner in = new Scanner(System.in);
 6 |         System.out.println("Enter a value : ");
 7 |         int num=in.nextInt();
 8 |         pattern(num);
 9 |     }
10 |     static void pattern (int n){
11 |         System.out.println("Right pascal triangle \n");
12 |         for (int i = 1; i <= 2 * n; i++) {
13 |             //
14 |             int res= i > n ? 2 * n - i  : i;
15 |             for (int j = 1; j <= res; j++) {
16 |                 System.out.print(" * ");
17 |             }
18 |             System.out.println();
19 |         }
20 |     }
21 | }
22 | 


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/square_hollow_.java:
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 1 | import java.util.*;
 2 | public class square_hollow_ {
 3 |     public static void main(String[] args) {
 4 |         Scanner in=new Scanner(System.in);
 5 |         System.out.println("Enter a number ");
 6 |         int n=in.nextInt();
 7 | 
 8 |         for(int i=0;i<n;i++)
 9 |         {
10 |             for(int j=0;j<n;j++)
11 |             {
12 |                 if(i==0||j==0||i==n-1||j==n-1)
13 |                 {
14 |                     System.out.print("*");
15 |                 }
16 |                 else{
17 |                     System.out.print(" ");
18 |                 }
19 | 
20 |             }
21 |             System.out.println("");
22 |         }
23 |     }
24 | }
25 | 


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/squarefillpattern.java:
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 1 | import java.util.*;
 2 | 
 3 | public class squarefillpattern {
 4 |     public static void main(String[] args) {
 5 |         Scanner in = new Scanner(System.in);
 6 |         System.out.println("Enter number");
 7 |         int num= in.nextInt();
 8 |         for(int i=0;i<num;i++)
 9 |         {
10 |             for(int j=0;j<num;j++)
11 |             {
12 |                 System.out.print(" * ");
13 |             }
14 |             System.out.println(" ");
15 |         }
16 |         in.close();
17 |     }
18 |     
19 | }
20 | 


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