Print Mirror Upper Star Triangle Pattern using java

 

  • Divide this into two parts
    • Upper part
    • Lower part
  • Both parts are a mirror reflection of each other. And each part comprises 2 triangles. Therefore, In total, we have to print 4 triangles to get the desired pattern.

Example 1: Upper Part

// Importing input output classes
import java.io.*;

// Main Class
class GFG {

// Method 1
// To print upper part of the pattern
private static void displayUpperPart(int size)
{

// Declaring variables for rows and columns
// respectively
int m, n;

// Outer loop for rows
for (m = size - 1; m >= 0; m--) {

// Inner loop 1
// to print triangle 1
for (n = 0; n < m; n++) {

// Printing whitespace
System.out.print(" ");
}

// Inner loop 2
// to print triangle 2
for (n = m; n <= size - 1; n++) {

// Printing star with whitespace
System.out.print("*"
+ " ");
}

// By now done with one rpw so next line
System.out.println();
}
}

// Method 2
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variables to
// size of the triangle
int size = 7;

// Calling the above Method 1 to
// print and display the upper part of triangle
displayUpperPart(size);
}
}

Example 2: Lower Part of the triangle 

// Importing input output classes
import java.io.*;

// Main Class
class GFG {

// Method 1
// To print lower part of the pattern
private static void displayLowerPart(int size)
{

// Declaring variables for rows and columns
// respectively
int m, n;

// Outer loop fo Rows
for (m = 1; m <= size; m++) {

// Inner loop 1 to print triangle 3
for (n = 1; n < m; n++) {

// Printing whitespace
System.out.print(" ");
}

// Inner loop 2 to print triangle 4
for (n = m; n <= size; n++) {

// Printing star and whitespace
System.out.print("*"
+ " ");
}

// By now done with one row so new line
System.out.println();
}
}

// Method 2
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variable to
// size of the triangle
// This is number of rows
int size = 7;

// Calling the above Method1
// to display lower part of the triangle
displayLowerPart(size);
}
}

Example 3: Complete Mirror Upper Star Triangle Pattern

// Importing input output classes
import java.io.*;

// Main Class
public class GFG {

// Method 1
// To print upper part of the pattern
private static void displayUpperPart(int size)
{

// Declaring variables for rows and columns
// respectively
int m, n;

// Outer loop for rows
for (m = size - 1; m >= 0; m--) {

// Inner loop 1
for (n = 0; n < m; n++) {

// Printing whitespace
System.out.print(" ");
}

// Inner loop 2
for (n = m; n <= size - 1; n++) {

// Printing star with whitespace
System.out.print("*"
+ " ");
}

// By now we are done with one row so new line
System.out.println();
}
}

// Method 2
// To print lower part of the pattern
private static void displayLowerPart(int size)
{

// Declaring variables for rows and columns
// respectively
int m, n;

// Outer loop for rows
for (m = 1; m <= size; m++) {

// Inner loop 1
for (n = 1; n < m; n++) {

// Printing whitespace
System.out.print(" ");
}

// Inner loop 2
for (n = m; n <= size; n++) {

// Printing star and whitespace
System.out.print("*"
+ " ");
}

// By now we are done with one row so new line
System.out.println();
}
}

// Method 3
// Main driver method
public static void main(String[] args)
{
// Declaring and initializing variable to
// size of the triangle
int size = 7;

// Calling Method 1 to
// display the upper part
displayUpperPart(size);

// Calling Method 2 to
// display lower part
displayLowerPart(size);
}
}

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