Java code to Floyd’s triangle star pattern

Java code to triangle star pattern

In this tutorial, we will discuss Java code to Floyd’s triangle star pattern using nested for loop.

We will learn how to create Floyd’s triangle pattern in Java programming language using for loop

Pattern 1

Java code to Floyd's triangle star pattern — Floyd’s triangle pattern 1

Code for Floyd’s triangle program 1

Java program to display the right triangle star pattern

import java.util.Scanner;
public class JavaStarPattern{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();//get input from user
for(int i=0; i<=rows; i++){
  for(int j=0; j<=i; j++){
     System.out.print("*");//print star
}
System.out.println();
}
}
}

When the above code is executed, it produces the following results:

Enter the number of rows: 9
*
**
***
****
*****
******
*******
********
*********
**********

Pattern 2

Code for Floyd’s triangle program 2

Java program to display mirrored right triangle star pattern

import java.util.Scanner;
public class JavaStarPattern{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();
for(int i=1; i<=rows; i++){//parent for loop for print rows
  for(int j=1; j<=rows-i; j++){
     System.out.print(" ");//print space
}
for(int k=1; k<=i; k++){
     System.out.print("*");//print star
}
System.out.println();//move to next line
}
}
}

When the above code is executed, it produces the following results:

Enter the number of rows: 9
                *
              **  
            ***
          ****
        *****
      ******
    *******
  ********
*********

Pattern 3

Code for Floyd’s triangle program 3

Java program to display reverse right triangle star pattern

import java.util.Scanner;
public class JavaStarPattern{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows\n: ");
int rows=sc.nextInt();//get input from user
for(int i=rows; i>=1; i--){
  for(int j=1; j<=i; j++){
     System.out.print("*");  /print star
}
System.out.println();
}
}
}

When the above code is executed, it produces the following results:

Enter the number of rows: 9

*********
********
*******
******
*****
****
***
**
*

Pattern 4

Code for Floyd’s triangle program 4

Program to display reverse mirrored right triangle star pattern

import java.util.Scanner;
public class JavaStarPattern{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();
for(int i=1; i<=rows; i++){//parent for loop lterate rows
  for(int j=1; j<=i; j++){
     System.out.print(" ");//print space
}
for(int k=i; k<=rows; k++){
     System.out.print("*");//print star
}
System.out.println();//move to next line
}
}
}

When the above code is executed, it produces the following results:

Enter te number of rows: 9
*********
  ********
    *******
      ******
        *****
          ****
            ***
              **
                *

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