Question

Thank you in advance.

Create a class called Main and write the main method. I need help with calling the printChart method

• Declare a variable to hold the grade as it is read in
• Declare 5 variables to hold counts to count the number of As, Bs, Cs, etc
• declare a variable to hold the class name and ask the user to enter the name of the class whose grades are going to be entered.
• Write a loop that reads in an integer (the grade) a negative value will terminate the loop
• The loop should check the grade entered and then add to the appropriate count depending on if the grade is an A, B, C, etc (90 – 100 is an A, 80 – 89 is a B, etc)
• After the loop has ended and all the counts have the values, create an object of the GradeHistogram class using the constructor in the class.
• Use the printChart method to print the histogram for the object you created.

The GradeHistogram class is:

public class GradeHistogram
{
private String className;
private int numAs;
private int numBs;
private int numCs;
private int numDs;
private int numFs;
  
public GradeHistogram(String className, int numAs, int numBs, int numCs,int numDs, int numFs)
{
this.className = className;
this.numAs = numAs;
this.numBs = numBs;
this.numCs = numCs;
this.numDs = numDs;
this.numFs = numFs;
}
  
public void setClassName(String name)
{
className = name;
}
public void setNumAs(int num)
{
numAs = num;
}
public void setNumBs(int num)
{
numBs = num;
}
public void setNumCs(int num)
{
numCs = num;
}
public void setNumDs(int num)
{
numDs = num;
}
public void setNumFs(int num)
{
numFs = num;
}
  
public String getClassName()
{
return className;
}
public int getNumAs()
{
return numAs;
}
public int getNumBs()
{
return numBs;
}
public int getNumCs()
{
return numCs;
}
public int getNumDs()
{
return numDs;
}
public int getNumFs()
{
return numFs;
}
  
private void printDataRow(String string, int numAs2)
{
System.out.print(string + ": ");
for (int i = 0; i < numAs2; i++) {
System.out.print("*");
}
System.out.println();
}
  
public void printChart()
{
System.out.println("Class Name: " + className);
printDataRow("Number of As", numAs);
printDataRow("Number of Bs", numBs);
printDataRow("Number of Cs", numCs);
printDataRow("Number of Ds", numDs);
printDataRow("NUmber of Fs", numFs);
  
}
  
}

Answer 1

The printChart function is needed to be called from somewhere. For this purpose, it can be called from constructor at the end.

public GradeHistogram(String className, int numAs, int numBs, int numCs, int numDs, int numFs) {
this.className = className;
this.numAs = numAs;
this.numBs = numBs;
this.numCs = numCs;
this.numDs = numDs;
this.numFs = numFs;
//calling the printchart function
printChart();
}

Beow is the screenshot of the snippet that is changed and the sample output.

Please ask in comments if you have any doubts.