用Java绘制简单数学函数图：例 - y = x²的图像画法

import javax.swing.JFrame;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class DrawMath {

	public static void main(String[] args) {

		XYSeries series = new XYSeries("xySeries");
		for (int x = -100; x < 100; x++) {
			int y = x*x;
			series.add(x, y);
		}
		
		XYSeriesCollection dataset = new XYSeriesCollection();
		dataset.addSeries(series);
		JFreeChart chart = ChartFactory.createXYLineChart(
				"y = x^2", // chart title
				"x", // x axis label
				"x^2", // y axis label
				dataset, // data
				PlotOrientation.VERTICAL,
				false, // include legend
				false, // tooltips
				false // urls
				);

		ChartFrame frame = new ChartFrame("my picture", chart);
		frame.pack();
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

}

显示效果：