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Java Program to Print Upper Star Triangle Pattern
In this article, we will understand how to print upper star triangle pattern. The pattern is formed by using multiple for-loops and print statements.
Below is a demonstration of the same −
Input
Suppose our input is −
Enter the number of rows : 8
Output
The desired output would be −
The upper star triangle star pattern : * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Algorithm
Step 1 - START Step 2 - Declare three integer values namely i, j and my_input Step 3 - Read the required values from the user/ define the values Step 4 - We iterate through two nested 'for' loops to get space between the characters. Step 5 - After iterating through the innermost loop, we iterate through another 'for' loop. This will help print the required character. Step 6 - Now, print a newline to get the specific number of characters in the subsequent lines. Step 7 - Display the result Step 8 - Stop
Example 1
Here, the input is being entered by the user based on a prompt. You can try this example live in our coding ground tool 
.
import java.util.Scanner;
public class UpperStarTriangle{
public static void main(String args[]){
int i, j, my_input;
System.out.println("Required packages have been imported");
Scanner my_scanner = new Scanner(System.in);
System.out.println("A reader object has been defined ");
System.out.print("Enter the number of rows : ");
my_input = my_scanner.nextInt();
System.out.println("The upper star triangle star pattern: ");
for (i=0; i<my_input; i++){
for (j=2*(my_input-i); j>=0; j--){
System.out.print(" ");
}
for (j=0; j<=i; j++ ){
System.out.print("* ");
}
System.out.println();
}
}
}Output
Required packages have been imported
A reader object has been defined
Enter the number of rows : 8
The upper star triangle star pattern:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *Example 2
Here, the integer has been previously defined, and its value is accessed and displayed on the console.
public class UpperStarTriangle{
public static void main(String args[]){
int i, j, my_input;
my_input = 8;
System.out.println("The number of rows is defined as " +my_input);
System.out.println("The upper star triangle star pattern: ");
for (i=0; i<my_input; i++){
for (j=2*(my_input-i); j>=0; j--){
System.out.print(" ");
}
for (j=0; j<=i; j++ ){
System.out.print("* ");
}
System.out.println();
}
}
}Output
The number of rows is defined as 8 The upper star triangle star pattern: * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Updated on: 25-Feb-2022
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