How to print star Pattern in the shape of Bar Graph in Java

Hi coders! Today we are going to learn how to print star pattern (*) in the shape of a bar graph in Java. Pattern printing is a very interesting and HOT topic for coding interviews. The bar graph pattern will look like this:-
The input will be given in the form of an array= {4, 3, 4, 5, 7}, the output will be like this:-

 

Also have a look at: Various Star Pattern Programming in Java

Method 1: Steps to follow
1) First, find the max number in the input array(max=7, row=7), This will give the no. of rows for the desired 2D matrix.
2) No. of elements in the input array (n=5, col=5) will give no. of columns for the desired 2D matrix.
3) First, we will fill the desired print in a 2D array in a horizontal way, and then we will print the 2D array in transpose way. In that, we will first print all the spaces and after sufficient spaces ( * )  will be printed.

After transpose, the desired print will be:-

Program to print star Pattern in the shape of Bar Graph in Java

public class bargraph {

  public static void main(String[] args) {
    int arr[]= {4,3,4,5,7};
    int len=arr.length;
    int max=0;
    
    for(int i=0;i<len;i++)   //find max of array
    {
      if (arr[i]>max)
      {
        max=arr[i];
      }
    }

    char [][]dis1=new char[len][max];

    for(int j=0;j<len;j++)   //store the array in horizontal order
    { 
      for(int i=0;i<max-arr[j];i++)	 
       dis1[j][i]=' ';
    
      for(int k=max-arr[j];k<max;k++)
      {	dis1[j][k]='*';
      
      }
        
    }
    
    for(int i=0;i<max;i++)  //print the array in transpose order 
    {
      for(int j=0;j<len;j++)
      System.out.print(dis1[j][i]+" ");	
      System.out.println();
    }
  }

Output:-

There are other methods too to print this pattern. You can also change the input array size and elements to print various bar graph pattern.

Hope you understand the code.