You should know that different pattern programs can be developed using different programming languages. And Java programming language is no different from that. We can also develop patterns in Java using the for loops & conditional statements.
Pattern programs are the most important sector for questions in every interview to enter into the software development field. In this article, we will discuss 20+ pattern programs in Java programming language.
So, let us start our discussion.
How Many Types Of Pattern Programs Present In Java?
In every programming language, pattern programs can be implemented using different kinds of elements. Based on those elements, the pattern programs can be differentiated into three parts. In the case of Java, the same thing is applied.
The patterns in Java programming language can be divided into three categories:
- Java Character Patterns
- Java Special Character Patterns or Java Star Patterns
- Java Numeric Patterns
We will know about each of them one by one along with sample examples & their output.
How Many Pattern Programs Belong To Java Character Patterns?
In such pattern programs, alphabetic characters are used to develop the design. Sometimes, the alphabetic character increases or decreases in order along with the number of rows value.
We can classify it into four parts.
#1 Triangle Character Pattern Program:
public class Main
{
public static void main(String[] args) {
int a = 115; // ASCII Value Of Character
for (int i = 0; i <= 2; i++) // Outer Loop
{
for (int j = 0; j <= i; j++) // Inner Loop
{
System.out.print((char) (a + j) + " "); // Print Pattern
}
System.out.println();
}
}
}Output:
#2 Row-Wise Alphabetic Triangle Pattern:
public class Main
{
public static void main(String[] args) {
int a = 115; // ASCII Value Of Character
for (int i = 0; i<= 2; i++) // Outer Loop
{
for (int j = 0; j <= i; j++) // Inner Loop
{
System.out.print((char) a + " "); // Print Pattern
}
a++;
System.out.println();
}
}
}Output:
#3 K-Style Alphabetic Character Pattern:
public class Main
{
/* Program Starts With Public Static Void Main (String[] args)Function*/
public static void main(String[] args) {
for (int i = 2; i >= 0; i--) // Outer Loop For Upper Part
{
int a = 115; // ASCII Value Of Upper Character
for (int j = 0; j <= i; j++) // Inner Loop For Upper Part
System.out.print((char) (a + j) + " "); // Printing Value
System.out.println();
}
for (int i = 0; i<= 2; i++) // Outer Loop For Lower Part
{
int b = 75; // ASCII Value Of Lower Character
for (int j = 0; j <= i; j++) // Inner Loop For Lower Part
{
System.out.print((char) (b + j) + " "); // Print Pattern
}
System.out.println();
}
}
}Output:
#4 Increasing Character In Triangle Pattern:
public class Main
{
public static void main(String[] args) {
for (int i = 0; i <= 2; i++) { // Outer Loop
int a = 115; // ASCII Value Of Character
for (int j = 2; j > i; j--) // Inner Loop
System.out.print(" ");
for (int k = 0; k <= i; k++) // Inner Loop
System.out.print((char) (a + k) + " "); // Print Pattern
System.out.println();
}
}
}Output:
How Many Pattern Programs Belong To Java Special Character Or Star Patterns?
In such pattern programs, special characters like *,#,@,& are used to develop the design. In this case, we have implemented star pattern programs or special character pattern programs using the character “@”.
Using some loops & conditions such designs are built along with the help of the number of rows. We can classify it into eleven parts. If you face any difficulties learning about the below pattern programs then worry not, you can get Java Hw Help from CodingZap experts and clear your confusion.
#1 Hollow Diamond Shape Pattern Program:
public class Main
{
public static void main(String[] args) { // Diamond Star Pattern Enter
int r = 3; // Number Of Rows
for (int i=1 ; i<= r ; i++) // Outer Loop
{
for (int j = r; j > i ; j--)
System.out.print(" ");
System.out.print("@");
for (int k = 1; k < 2*(i -1) ;k++)
System.out.print(" ");
if(i==1)
System.out.println("");
else
System.out.println("@"); // Print Pattern
}
for (int i=r-1; i>= 1 ; i--)
{
for (int j = r; j > i ; j--)
System.out.print(" ");
System.out.print("@"); // Print Pattern
for (int k = 1; k < 2*(i -1) ;k++)
System.out.print(" ");
if(i==1)
System.out.println("");
else
System.out.println("@"); // Print Pattern
}
}
}Output:
#2 Downward Special Character Triangle:
public class Main
{
public static void main(String[] args) { // Down Triangle Star Pattern Enter
int r = 3; // Number Of Rows
for (int i=r; i>= 1 ; i--) // Outer Loop
{
for (int j = i; j < r ; j++)
System.out.print(" ");
for (int k = 1; k <= (2*i -1) ;k++) {
if(k==1 || i == r || k == (2*i-1))
System.out.print("@"); // Print Pattern
else
System.out.print(" ");
}
System.out.println("");
}
}
}Output:
#3 Upward Special Character Triangle:
public class Main
{
/* Program Starts With Public Static Void Main (String[] args)Function*/
public static void main(String[] args) {
int r = 3; // Number of Rows
for (int i=1; i<= r ; i++) // Outer Loop
{
for (int j = i; j < r ; j++)
System.out.print(" ");
for (int k = 1; k <= (2*i -1) ;k++) {
if( k==1 || i == r || k==(2*i-1))
System.out.print("@"); // Print Pattern
else
System.out.print(" ");
}
System.out.println("");
}
}
}
/* Here, the program also resembles with Pyramid star pattern or spceial character pattern */Output:
#4 Left Pascal’s Triangle Program With Special Characters:
public class Main
{
/* Program Starts With Public Static Void Main (String[] args)Function*/
public static void main(String[] args) {
int r = 3; // Number Of Rows
for (int i= 1; i<= r ; i++) // Outer Loop
{
for (int j=i; j < r ;j++)
System.out.print(" ");
for (int k=1; k <= i ; k++)
System.out.print("@"); // Left Triangle Pascal's Enter
System.out.println("");
}
for (int i=r; i>=1; i--)
{
for(int j=i; j<=r;j++)
System.out.print(" ");
for(int k=1; k<i ;k++)
System.out.print("@"); // Left Triangle Pascal's Enter
System.out.println("");
}
}
}Output:
#5 Right Pascal’s Triangle With Special Character:
public class Main
{
/* Program Starts With Public Static Void Main (String[] args)Function*/
public static void main(String[] args) {
int r = 3; // Number Of Rows
for (int i= 0; i<= r-1 ; i++) // Outer Loop
{
for (int j=0; j<=i; j++)
{
System.out.print("@"); // Pattern Programs Enter
System.out.print(" ");
}
System.out.println("");
}
for (int i=r-1; i>=0; i--)
{
for(int j=0; j <= i-1;j++)
{
System.out.print("@"); // Print Character
System.out.print(" ");
}
System.out.println("");
}
}
}Output:
#6 Reverse Pyramid Program With Special Character:
public class Main
{
/* Program Starts With Public Static Void Main (String[] args)Function*/
public static void main(String[] args) {
int r = 3; // Number Of Rows Value
for (int i= 0; i<= r-1 ; i++) // Outer Loop
{
for (int j=0; j<=i; j++)
System.out.print(" ");
for (int k=0; k<=r-1-i; k++)
{
System.out.print("@"); // Printing Pattern
System.out.print(" ");
}
System.out.println();
}
}}Output:
#7 Right Triangle Star Pattern Or Special Character Pattern:
public class Main
{
// Triangle Star Program Enter, means starting field
public static void main(String[] args) {
int i;
int j;
int n = 3; // Number Of Rows
for(i=0; i<n; i++){ // Outer Loop
for(j=0; j<=i; j++) // Inner loop
System.out.print("@" + " "); // Printing Pattern
System.out.println();}
}}Output:
#8 Reverse Right Triangle Special Character Pattern:
public class Main
{
/* Mirror Star Pattern Enter or Starting of Reverse Right Triangle Special Character Pattern */
public static void main(String[] args) {
int i;
int j;
int r = 3; // Number Of Rows
for (i = r-1; i>=0 ; i--) // Outer Loop
{
for (j = 0; j<=i; j++) // Inner Loop
System.out.print("@ ");
System.out.println();
}}}Output:
#9 Left Triangle Star Pattern Or Special Character Pattern (Mirror Of Right Angled):
public class Main
{
public static void main(String[] args) {
int r = 2; // Number Of rows
for (int i= 0; i<= r; i++) // Outer Loop
{
for (int j=1; j<=r-i; j++) // Inner Loop
System.out.print(" ");
for (int k=0;k<=i;k++) // Inner Loop
System.out.print("@"); // Printing Pattern
System.out.println();
}
}}Output:
#10 Reverse Left Triangle Special Character Pattern:
public class Main
{
public static void main(String[] args) {
int r = 3; // Number Of Rows
for (int i = r; i>= 1; i--) // Outer Loop
{
for (int j = r; j>i; j--) // Inner Loop
System.out.print(" ");
for (int k=1;k<=i;k++) // Inner Loop
System.out.print("@"); // Printing Pattern
System.out.println();
}
}}Output:
#11 Full Diamond Shape Pattern Program:
public class Main
{
public static void main(String[] args) {
int r = 2; // Number Of Rows
int i;
int j;
int a = r-1; // Number Of Space
for (j = 1; j<= r; j++) // Outer Loop For Upper Part
{
for (i = 1; i<= a; i++) // Inner Loop For Upper Part
System.out.print(" ");
a--;
for (i = 1; i <= 2 * j - 1; i++) // Inner Loop For Upper Part
System.out.print("@");
System.out.println();
}
a = 1;
for (j = 1; j<= r - 1; j++) // Outer Loop For Lower Part
{
for (i = 1; i<= a; i++) // Inner Loop For Lower Part
System.out.print(" ");
a++;
for (i = 1; i<= 2 * (r - j) - 1; i++) // Inner Loop For Lower Part
System.out.print("@");
System.out.println();
}
}}Output:
How Many Pattern Programs Belong To Java Character Patterns?
The number pattern program is defined as the series of numbers used to make the design. The numbers might get increased along with the number of rows inside the program. Sometimes, we might go for a binary number pattern entry program also.
The article precisely focuses on a total of six number pattern programs.
#1 Increasing Right Triangle Numeric Pattern:
public class Main
{
public static void main(String[] args) {
int n = 3; // Number Of Rows
int a; // Declartion Of Variable int a
int i; // Declartion Of Variable int i
int j; // Declartion Of Variable int j
for(i=0; i<n; i++) // Outer Loop
{
a = 1;
for(j=0; j<=i; j++) // Inner Loop
{
System.out.print(a + " "); // No Pattern Void Display Function used To Print
a++;
}
System.out.println();
}
}}Output:
#2 Decreasing Right Triangle Numeric Pattern:
public class Main
{
/* Triangle Numeric Pattern Enter or Starting of The Pattern Program*/
public static void main(String[] args) {
int n = 3; // Number Of Rows
int i; // Declartion Of Variable int i
int j; // Declartion Of Variable int j
for (i = n; i >= 1; i--) // Outer Loop
{
for (j = n; j >= i; j--) // Inner Loop
System.out.print(j+" "); // Printing Pattern
System.out.println();
}
}}Output:
#3 Pascal Number Triangle Pattern:
public class Main
{
public static void main(String[] args) {
int n = 3; // Number Of Rows
int i; // Declartion Of Variable int i
int j; // Declartion Of Variable int j
for (i = 0; i < n; i++) { // Outer Loop
int a = 1; // Space Number
System.out.printf("%" + (n - i) * 2 + "s", ""); // Printing Pattern
for (j = 0; j <= i; j++) {
System.out.printf("%4d", a); // Printing Pattern
a = a * (i - j) / (j + 1);
}
System.out.println();
}
}}Output:
#4 Each Number In Each Row Pattern:
public class Main
{
public static void main(String[] args) {
int n = 3; // Number Of Rows
int i; // Declartion Of Variable int i
int j; // Declartion Of Variable int j
for (i = 1; i <= n; i++) // Outer Loop
{
for (j = 1; j <= i; j++) // Inner Loop
System.out.print(i+" "); // Printing Pattern
System.out.println();
}
}}Output:
#5 Row Wise Decreasing Pattern:
public class Main
{
/* Descending Order Pattern Enter Point*/
public static void main(String[] args) {
int n = 3; // Number Of Rows
int i; // Declartion Of Variable int i
int j; // Declartion Of Variable int j
for (i = 1; i <= n; i++) // Outer Loop
{
for (j = i; j >= 1; j--) // Inner Loop
System.out.print(j+" "); // Printing Pattern
System.out.println();
}
}}Output:
#6 Sandglass Number Pattern:
public class Main
{
/* Sandglass Star Pattern Enter & Starting Point of Program*/
public static void main(String[] args) {
int n = 2; // Number Of Rows
for (int i = 1; i <= n; i++) // Outer Loop For Upper Part
{
for (int j = 1; j < i; j++) // Inner Loop For Upper Part
System.out.print(" ");
for (int k = i; k <= n; k++) // Inner Loop For Upper Part
System.out.print(k+" ");
System.out.println();
}
for (int i = n-1; i >= 1; i--) // Outer Loop For Lower Part
{
for (int j = 1; j < i; j++) // Inner Loop For Lower Part
System.out.print(" ");
for (int k = i; k <= n; k++) // Inner Loop For Lower Part
System.out.print(k+" ");
System.out.println();
}
}}Output:
Conclusion:
From the above discussion we hope, the concept of pattern programs in Java is much more clear to you.
All the sample programs are implemented by taking the Public Static Void Main function as the base. We have not declared any special user-defined function besides the Public Static Void Main function. You should remember that.
We advise you to focus on the basic concept of Java programming language, more specifically on loops & conditional statements. Because the pattern programs are the result of particular usage of such concepts. Loops is an interesting concept and loop has different features in each programming language. Like, a loop in Python is used for iteration. If you get the condition for implementing that, it will become one cakewalk for you. If you want to know more about patterns in Java, then you can read out our article on MVC architecture in Java and know about patterns.
