This article is aimed at giving a Java implementation for pattern printing.

Simple pyramid pattern

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import java.io.*;

// Java code to demonstrate star patterns
public class GeeksForGeeks
{

// Function to demonstrate printing pattern 
    public static void printStars(int n) 
    { 
        int i, j; 

        // outer loop to handle number of rows 
        //  n in this case 
        for(i=0; i<n; i++) 
        { 

            //  inner loop to handle number of columns 
            //  values changing acc. to outer loop     
            for(j=0; j<=i; j++) 
            { 
                // printing stars 
                System.out.print("* "); 
            } 

            // ending line after each row 
            System.out.println(); 
        } 
   } 

After 180 degree rotation

// Driver Function
public static void main(String args[])
{
int n = 5;
printStars(n);
}
}

// Function to demonstrate printing pattern 
    public static void printStars(int n) 
    { 
        int i, j; 

        // outer loop to handle number of rows 
        //  n in this case 
        for(i=0; i<n; i++) 
        { 

            // inner loop to handle number spaces 
            // values changing acc. to requirement 
            for(j=2*(n-i); j>=0; j--) 
            { 
                // printing spaces 
                System.out.print(" "); 
            } 

            //  inner loop to handle number of columns 
            //  values changing acc. to outer loop 
            for(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[]) 
    { 

Printing Triangle

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import java.io.*;

// Java code to demonstrate star pattern
public class GeeksForGeeks
{

// Function to demonstrate printing pattern 
    public static void printTriagle(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; 
        printTriagle(n); 
    } 
}