Tutorial Playlist
191 Lessons1. Introduction to Java
2. What is Java?
3. History of Java
4. Java Tutorial for Beginners
5. How Do Java Programs Work?
6. JDK in Java
7. C++ Vs Java
8. Java vs. Python
9. Java vs. JavaScript
10. From Java Source Code to Executable
11. How to Install Java in Linux
12. How to Install Java in Windows 10
13. Java Hello World Program
14. Structure of Java Program and Java Syntax
15. Operators in Java
16. Java If-else
17. Switch Case In Java
18. Loops in Java
19. Infinite loop in Java
20. For Loop in Java
21. For Each Loop in Java
22. Constructor in Java
23. Constructor Overloading in Java
24. Copy Constructor in Java
25. Default Constructor in Java
26. Parameterized Constructors in Java
27. Constructor Chaining In Java
28. Finalize Method in Java
29. Static Method in Java
30. Equals Method in Java
31. Abstract Method in Java
32. toString() Method in Java
33. Difference between equals method in Java
34. Inheritance in Java
35. Multiple Inheritance in Java
36. Hierarchical Inheritance in Java
37. Java Classes and Objects
38. Scanner Class in java
39. All classes in java are inherited from which class
40. What is Nested Class in Java
41. POJO Class in Java
42. Anonymous Class in Java
43. Final Class in Java
44. Object Class in Java
45. Packages in Java
46. Access Modifiers in Java
47. Static Keyword In Java
48. Final Keyword in Java
49. Checked and Unchecked Exceptions in Java
50. User Defined Exception in Java
51. Error vs. Exception in Java
52. Java Collection
53. Collections in Java
54. Garbage Collection in Java
55. Generics In Java
56. Java Interfaces
57. Functional Interface in Java
58. Marker Interface in Java
59. Streams in Java
60. Byte stream in java
61. File Handling in Java
62. Thread in Java
63. Thread Lifecycle In Java
64. Daemon Thread in Java
65. Thread Priority in Java
66. Deadlock in Java
67. String Pool in Java
68. Java Database Connectivity(JDBC)
69. Design Patterns in Java
70. Functional Programming in Java
71. OOP vs Functional vs Procedural
72. Heap Memory and Stack Memory in Java
73. Applet in Java
74. Java Swing
75. Java Frameworks
76. Hibernate Framework
77. JUnit Testing
78. How to Install Eclipse IDE for Java?
79. Command line arguments in Java
80. Jar file in Java
81. Java Clean Code
82. OOPs Concepts in Java
83. Java OOPs Concepts
84. Overloading vs Overriding in Java
85. Java 8 features
86. String in Java
87. String to int in Java
88. Why String Is Immutable in Java?
89. Primitive Data Types in Java
90. Non-Primitive Data Types in Java
91. This and Super Keyword in Java
92. HashMap in Java
93. Comparable And Comparator in Java
94. Type Casting in Java
95. Arrays Sort in Java with Examples
96. Variable Hiding and Variable Shadowing in Java
97. Enum in Java
98. Substring in Java
99. Pattern Programs in Java
Now Reading
100. Hashcode in Java
101. What is ByteCode in Java?
102. How To Take Input From User in Java
103. GCD of Two Numbers in Java
104. Linked List in Java
105. Arithmetic Operators in Java
106. Conditional Operators in Java
107. Stack and Queue in Java
108. Array Length in Java
109. Number Pattern Program in Java
110. Split in java
111. Map In Java
112. Difference Between Throw and Throws in Java
113. Difference Between Data Hiding and Abstraction
114. HashSet in Java
115. String Length in Java
116. Factorial Using Recursion in Java
117. DateFormat in Java
118. StringBuilder Class in java
119. Instance variables in Java
120. Java List Size
121. Java APIs
122. Reverse an Array in Java
123. StringBuffer and StringBuilder Difference in Java
124. Java Program to Add Two Numbers
125. String to Array in Java
126. Regular Expressions in Java
127. Identifiers in Java
128. Data Structures in Java
129. Set in Java
130. Pass By Value and Call By Reference in Java
131. Try Catch in Java
132. Bubble Sort in Java
133. Caesar Cipher Program in Java
134. Queue in Java
135. Object Creation in Java
136. Multidimensional Array in Java
137. How to Read a File in Java
138. String Comparison in Java
139. Volatile Keyword in Java
140. Control Statements in Java
141. Jagged Array in Java
142. Two-Dimensional Array in Java
143. Java String Format
144. Replace in Java
145. charAt() in Java
146. CompareTo in Java
147. Matrix Multiplication in Java
148. Static Variable in Java
149. Event Handling in Java
150. parseInt in Java
151. Java ArrayList forEach
152. Abstraction in Java
153. String Input in Java
154. Logical Operators in Java
155. instanceof in Java
156. Math Floor in Java
157. Selection Sort Java
158. int to char in Java
159. Stringtokenizer in java
160. Implementing and Manipulating Abs in Java
161. Char array to string in java
162. Convert Double To String In Java
163. Deque in Java
164. Converting a List to an Array in Java
165. The Max function in java
166. Removing whitespace from string in java
167. String arrays in Java
168. Strings in Java Vs Strings in Cpp
169. Sum of digits of a number in Java
170. Art of Graphical User Interfaces
171. Trim in Java
172. RxJava
173. Recursion in Java
174. HashSet Java
175. Difference Between Java and Python
176. Square Root in Java
177. Reverse A String in Java
178. Even Odd Program in Java
179. Fibonacci Series in Java
180. Prime Number Program in Java
181. Java Program to Print Prime Numbers in a Given Range
182. Java Leap Year Program
183. Swapping of Two Numbers in Java
184. LCM of Two Numbers in Java
185. Math.sqrt() Function in Java
186. Area of Triangle in Java
187. Sort a String In Java
188. Factorial Program in Java
189. Javafx
190. Lambda expression in java
191. Setup Java Home and IDE on macOS
“Pattern” is a relatively newer addition to Java. If you want to be a professional computer science expert or programmer, you must clearly understand pattern programs in Java. This article provides a holistic insight into what Pattern programs in Java mean.
This tutorial mainly deals with printing patterns in Java, the different patterns in Java, and pattern programs in Java. Read on to learn more!
You can print different patterns using loops, such as for loops, while loops, and do-while loops in Java. Here are some examples of common patterns:
1. Print a right triangle of stars
public class Main {
public static void main(String[] args) {
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
System.out.print("* ");
}
System.out.println();
}
}
}
2. Print a square of stars
public class Main {
public static void main(String[] args) {
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 5; j++) {
System.out.print("* ");
}
System.out.println();
}
}
}
3. Print a diamond of stars
public class Main {
public static void main(String[] args) {
int n = 5;
// Print upper half of the diamond
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
// Print lower half of the diamond
for (int i = n - 1; i >= 1; i--) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
}
}
These are just a few examples, but you can print many other patterns in Java depending on your needs. The key is to use nested loops to iterate over the rows and columns of the pattern.
Let us learn some more star pattern programs in Java:
We have already covered the right triangle star pattern earlier in the article. Let us now check out the left triangle star pattern.
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
// Print spaces
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
// Print stars
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = rows; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = rows; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
// Upper Half
for (int i = 1; i <= rows; i++) {
for (int j = 1; j < i; j++) {
System.out.print(" ");
}
for (int k = i; k <= rows; k++) {
System.out.print("* ");
}
System.out.println();
}
// Lower Half
for (int i = rows - 1; i >= 1; i--) {
for (int j = 1; j < i; j++) {
System.out.print(" ");
}
for (int k = i; k <= rows; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
int number = 1;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(number + " ");
number++;
}
System.out.println();
}
}
}
In this code, the outer for loop controls the number of rows in the pattern. It starts from i = 1 and goes up to rows, representing the total number of rows in the pattern.
Within each row, the inner for loop is responsible for printing the numbers. It starts from j = 1 and goes up to i, ensuring that the number of numbers printed in each row matches the current row number.
The number variable keeps track of the current number to be printed. It starts with 1 and increments after printing each number.
The System.out.println() statement is placed outside the inner loop to move to the next line after printing the numbers for each row.
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 0; i < rows; i++) {
int number = 1;
// Print spaces
for (int j = 0; j < rows - i - 1; j++) {
System.out.print(" ");
}
// Print numbers
for (int j = 0; j <= i; j++) {
System.out.printf("%-4d", number);
number = number * (i - j) / (j + 1);
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 0; i < rows; i++) {
int number = 1;
// Print numbers
for (int j = 0; j <= i; j++) {
System.out.printf("%-4d", number);
number = number * (i - j) / (j + 1);
}
System.out.println();
}
}
}
Let us learn some character pattern programs in Java:
public class Main {
public static void main(String[] args) {
int rows = 5;
char currentChar = 'A';
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(currentChar + " ");
currentChar++;
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
char currentChar = 'A';
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(currentChar + " ");
currentChar++;
if (currentChar > 'Z') {
currentChar = 'A';
}
}
System.out.println();
}
}
}
Here are some more Java pattern programs:
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows; j++) {
if (i == 1 || i == rows || j == 1 || j == rows) {
System.out.print("* ");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
int number = 1;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print(number + " ");
number++;
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
int number = 1;
for (int i = rows; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print(number + " ");
number++;
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
int spaces = rows - 1;
int midRow = rows / 2;
for (int i = 0; i < rows; i++) {
for (int j = 0; j < spaces; j++) {
System.out.print(" ");
}
System.out.print("* ");
if (i >= midRow) {
int innerSpaces = 2 * (i - midRow) + 1;
for (int j = 0; j < innerSpaces; j++) {
System.out.print(" ");
}
System.out.print("*");
}
System.out.println();
spaces--;
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= i; j++) {
int value = (i + j) % 2;
System.out.print(value + " ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
int num = 1;
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print(num + " ");
num++;
}
num -= 2;
for (int k = 1; k <= i - 1; k++) {
System.out.print(num + " ");
num--;
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
for (int i = rows - 1; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = rows; i >= 1; i--) {
for (int j = 1; j <= i; j++) {
System.out.print("* ");
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
if (k == 1 || k == 2 * i - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
for (int i = rows - 1; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
if (k == 1 || k == 2 * i - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
public class Main {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j < i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= (rows - i + 1) * 2 - 1; k++) {
if (k == 1 || k == (rows - i + 1) * 2 - 1 || i == 1 || i == rows) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
for (int i = rows - 1; i >= 1; i--) {
for (int j = 1; j < i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= (rows - i + 1) * 2 - 1; k++) {
if (k == 1 || k == (rows - i + 1) * 2 - 1 || i == 1 || i == rows) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
This tutorial provided a glimpse of what pattern programs in Java are with several examples. It is an important part of Java, and you can master it with the help of materials available on the internet. If you need further help and want to learn to program professionally, enroll in one of the many computer science courses offered by learning platforms like upGrad.
1. What are some common patterns that can be printed in Java?
Some common patterns include triangles (right, isosceles, equilateral), squares (filled, hollow), rectangles, diamonds, pyramids, and zigzag lines. A number triangle pattern in Java is also common.
2. How do I print a pattern in reverse order?
To print a pattern in reverse order, you can use nested loops and adjust the loop conditions and the order of printing the characters or strings to reverse the pattern.
3. How do I print a pattern of numbers instead of characters or strings?
You can use nested loops to replace the character or printed string with the desired number. You can also use arithmetic operations or conditional statements to print a specific pattern of numbers.
PAVAN VADAPALLI
Director of Engineering
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upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...