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public class AppChart extends JFrame {
 
	private static final long serialVersionUID = 1L;
 
	Map<Integer, List<Categorie>> map;
 
	private void init() {
		map = new HashMap<>();
 
		for (int i = 0; i < 25; i++) {
			List<Categorie> cat1 = new ArrayList<>();
 
			cat1.add(new Categorie("Appli 1", Math.random() * 100));
			cat1.add(new Categorie("Appli 2", Math.random() * 100));
			cat1.add(new Categorie("Appli 3", Math.random() * 10));
			cat1.add(new Categorie("Appli 4", Math.random() * 10));
 
			map.put(i, cat1);
		}
	}
 
	private void displayChart() {
 
		final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
 
		for (Map.Entry<Integer, List<Categorie>> entry : map.entrySet()) {
			for (Categorie categorie : entry.getValue()) {
				dataset.addValue(categorie.getCPU(), categorie.getName(), entry.getKey());
			}
		}
 
		final JFreeChart barChart = ChartFactory.createBarChart("Utilisation CPU", "Heure", "%", dataset,
				PlotOrientation.VERTICAL, true, true, false);
 
		final ChartPanel cPanel = new ChartPanel(barChart);
		setContentPane(cPanel);
	}
 
	private class Categorie {
		String name;
		double CPU;
 
		public Categorie(String name, double cpu) {
			this.name = name;
			this.CPU = cpu;
		}
 
		public double getCPU() {
			return CPU;
		};
 
		public String getName() {
			return name;
		}
 
	}
 
	public static void main(String[] args) {
		AppChart app = new AppChart();
		app.init();
		app.displayChart();
		app.pack();
		app.setVisible(true);
	}
} | 
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