Draw a bar chart in Java

By: Paawan Chaudhary Viewed: 154634 times  Printer Friendly Format    


This is a Java program to draw a bar chart for the table given below which shows annual result analysis of a school from period 2001-2005.these values may be placed in a HTML file as <param> attributes and then used in Applet for dislaying bar-chart.

Year	2001	2002	2003	2004	2005
Result %	80	90	100	100	98

 

import java.applet.*;
import java.awt.*;

/*
<applet code = "BarChart.class" width=400 height=400>

<param name="year0" value="2001">
<param name="year1" value="2002">
<param name="year2" value="2003">
<param name="year3" value="2004">
<param name="year4" value="2005">

<param name="result0" value="80">
<param name="result1" value="90">
<param name="result2" value="100">
<param name="result3" value="100">
<param name="result4" value="98">

</applet>
*/

public class BarChart extends Applet
{
	int n;
	String year[];
	int value[];

	public void init()
	{
		n = 5;
		year = new String[n];
		value = new int[n];

		year[0] = getParameter("year0");
		year[1] = getParameter("year1");
		year[2] = getParameter("year2");
		year[3] = getParameter("year3");
		year[4] = getParameter("year4");

		value[0] = Integer.parseInt(getParameter("result0"));
		value[1] = Integer.parseInt(getParameter("result1"));
		value[2] = Integer.parseInt(getParameter("result2"));
		value[3] = Integer.parseInt(getParameter("result3"));
		value[4] = Integer.parseInt(getParameter("result4"));

	}

	public void paint(Graphics g)
	{
		Font font = new Font("Arial",Font.BOLD,15);
		g.setFont(font);
		for(int i  = 0; i < n; i ++)
		{
			g.setColor(Color.BLUE);
			g.drawString(year[i], 20, i * 50 + 30);
			g.setColor(Color.RED);
			g.fillRect(70, i * 50 + 10, value[i], 40);
			g.drawString(String.valueOf(value[i]) + "%", 180, i * 50 + 35);
		}

		String msg = "Bar Chart from Year 2001 - 2005";
		g.setColor(Color.darkGray);

		font = new Font("Arial",Font.BOLD,20);
		g.setFont(font);
		g.drawString(msg, 50, 300);
	}
}


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