Java library to create graphs [closed]

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What is best and easy to use library for Java graphs? I am working with Swing application and need to integrate a graph for that project

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Options

• If graphs you mean like clusters nodes and links visualization have a look at graphviz gallery

• To generate charts see jfreechart demo Download jfreechart jfreechart-1.0.13

• Use java advanced imaging - jai see histogram demo source

Steps to create a chart using jfreechart

Create Dataset and pass array of data

HistogramDataset dataset = new HistogramDataset();
dataset.addSeries("series label",arrayOfValues,noOfBins);

Create a chart object

JFreeChart chart = ChartFactory.
createHistogram( "plotTitle", "xaxis label", "yaxis label", 
                dataset, PlotOrientation.VERTICAL, false, false, false);

If swing application use ChartPanel to render chart

ChartPanel chartPanel = new ChartPanel(chart)
chartPanel.setPreferredSize(new java.awt.Dimension JavaDoc(500, 270));
chartPanel.setMouseZoomable(true, false);

If need to write chart to a file/stream use ChartUtilities.saveChartAsPNG(...)

ChartUtilities.saveChartAsPNG(new File("histogram.PNG"), chart, width, height);

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One commonly used charting API is JFreeChart.

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I answered in this thread, could be helpful Java graph library for dynamic visualisation