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# Java Program to Print Pyramid Star Pattern

This article will guide you through the process of printing a Pyramid star pattern in Java.

1. Simple pyramid pattern

## Java

 `import` `java.io.*;` `// Java code to demonstrate Pyramid star patterns``public` `class` `GeeksForGeeks {``    ``// Function to demonstrate printing pattern``    ``public` `static` `void` `PyramidStar(``int` `n)``    ``{``        ``int` `a, b;` `        ``// outer loop to handle number of rows``        ``// k in this case``        ``for` `(a = ``0``; a < n; a++) {` `            ``// inner loop to handle number of columns``            ``// values changing acc. to outer loop``            ``for` `(b = ``0``; b <= a; b++) {``                ``// printing stars``                ``System.out.print(``"* "``);``            ``}` `            ``// end-line``            ``System.out.println();``        ``}``    ``}` `    ``// Driver Function``    ``public` `static` `void` `main(String args[])``    ``{``        ``int` `k = ``5``;``        ``PyramidStar(k);``    ``}``}`

Output

```*
* *
* * *
* * * *
* * * * * ```

## Java

 `/*package whatever //do not write package name here */` `import` `java.io.*;` `class` `GFG``{   ``      ``// similar to inner for loop``      ``public` `static` `void` `printRow(``int` `n)``    ``{``         ``if``(n == ``0``)``        ``{``            ``return``;``        ``}``          ``System.out.print(``"* "``);``          ``printRow(n - ``1``); ``// recursive call for printing desired numbers of stars in a single row``    ``}``  ` `      ``// similar to outer for loop``      ``public` `static` `void` `changeRow(``int` `n) ``// for number of rows.....it prints stars for each row``    ``{   ``          ``if``(n == ``0``)``        ``{``             ``return``;``        ``}` `          ``changeRow(n - ``1``); ``// recursive call for next row..``          ``printRow(n); ``// prints stars in a single row..``          ``System.out.print(``"\n"``); ``// for changing the row....new line``    ``}``  ` `    ``public` `static` `void` `main (String[] args)``    ``{``        ``GFG.changeRow(``5``); ``// no need of object as changeRow is static method...``    ``}``}`

Output

```*
* *
* * *
* * * *
* * * * * ```

Time Complexity: O(n2), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

2. After 180 degrees rotation/Mirrored pattern

Here we will print a star pyramid with a rotation of 180 degrees.

## Java

 `import` `java.io.*;` `// 180 flipped pyramid star pattern``public` `class` `GFG {``    ``// Function to demonstrate printing pattern``    ``public` `static` `void` `FlippedPyramidStar(``int` `k)``    ``{``        ``int` `a, b;` `        ``// 1st loop``        ``for` `(a = ``0``; a < k; a++) {` `            ``// nested 2nd loop``            ``for` `(b = ``2` `* (k - a); b >= ``0``; b--) {``                ``// printing spaces``                ``System.out.print(``" "``);``            ``}` `            ``// nested 3rd loop``            ``for` `(b = ``0``; b <= a; b++) {``                ``// printing stars``                ``System.out.print(``"* "``);``            ``}` `            ``// end-line``            ``System.out.println();``        ``}``    ``}` `    ``// Driver Function``    ``public` `static` `void` `main(String args[])``    ``{``        ``int` `k = ``5``;``        ``FlippedPyramidStar(k);``    ``}``}`

Output

```           *
* *
* * *
* * * *
* * * * * ```

Time Complexity: O(n2), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

3. Printing Triangles:

## Java

 `import` `java.io.*;` `// Java code to demonstrate star pattern``public` `class` `GeeksForGeeks {``    ``// Function to demonstrate printing pattern``    ``public` `static` `void` `printTriangle(``int` `n)``    ``{``        ``// outer loop to handle number of rows``        ``// n in this case``        ``for` `(``int` `i = ``0``; i < n; i++) {` `            ``// inner loop to handle number spaces``            ``// values changing acc. to requirement``            ``for` `(``int` `j = n - i; j > ``1``; j--) {``                ``// printing spaces``                ``System.out.print(``" "``);``            ``}` `            ``// inner loop to handle number of columns``            ``// values changing acc. to outer loop``            ``for` `(``int` `j = ``0``; j <= i; j++) {``                ``// printing stars``                ``System.out.print(``"* "``);``            ``}` `            ``// ending line after each row``            ``System.out.println();``        ``}``    ``}` `    ``// Driver Function``    ``public` `static` `void` `main(String args[])``    ``{``        ``int` `n = ``5``;``        ``printTriangle(n);``    ``}``}`

Output

```    *
* *
* * *
* * * *
* * * * * ```

4-Star pattern

## Java

 `/*package whatever //do not write package name here */` `import` `java.io.*;` `class` `GFG {``    ``public` `static` `void` `main (String[] args) {``        ``for` `(``int` `i=``0``;i<``5``;i++)``        ``{``            ``for` `(``int` `j=``0``;j<``5``;j++)``        ` `            ``{``                ``System.out.print(``"*"``);``            ``}``            ``System.out.println();``        ``}``    ``}``}`

Output

```*****
*****
*****
*****
*****```

5-  Another different Star  pattern

## Java

 `/*package whatever //do not write package name here */` `import` `java.io.*;` `class` `GFG {``    ``public` `static` `void` `main (String[] args) {``         ``int` `n=``5``;``        ``for` `(``int` `i=n;i>=``1``;i--)``        ``{``            ``for` `(``int` `j=i;j>=``1``;j--)``            ``{``                ``System.out.print(``"* "``);``            ``}``            ``System.out.println();``        ``}``    ``}``}`

Output

```* * * * *
* * * *
* * *
* *
* ```

## Java

 `/*package whatever //do not write package name here */` `import` `java.io.*;` `class` `GFG``{   ``      ``// similar to inner for loop``      ``public` `static` `void` `printRow(``int` `n)``    ``{``         ``if``(n == ``0``)``        ``{``            ``return``;``        ``}``          ``System.out.print(``"* "``);``          ``printRow(n - ``1``); ``// recursive call for printing desired numbers of stars in a single row``    ``}``  ` `      ``// similar to outer for loop``      ``public` `static` `void` `changeRow(``int` `n) ``// for number of rows.....it prints stars for each row``    ``{   ``          ``if``(n == ``0``)``        ``{``             ``return``;``        ``}``        ` `          ``printRow(n); ``// prints stars in a single row..``          ``System.out.print(``"\n"``); ``// for changing the row....new line``          ``changeRow(n - ``1``); ``// recursive call for next row..``    ``}``  ` `    ``public` `static` `void` `main (String[] args)``    ``{``        ``GFG.changeRow(``5``); ``// no need of object as changeRow is static method...``    ``}``}`

Output

```* * * * *
* * * *
* * *
* *
* ```

Time Complexity: O(n2), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

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