java - 如何使图表显示数组元素

Question

我有 6 个数字，都是从 0 到 100。我需要将其放入图表中，我已经有了图表的代码，但不知道如何将其链接到我的数组。该图表使用条形图。这是我的代码，它是我拥有的其他两个数组的平均值:

public static void computeResults(double[] examMarks, double[] courseworkmarks)
{
    double avgMarks[] =new double[examMarks.length];
    System.out.println ("The total average of each module is ");
    for(int i=0;i<avgMarks.length;i++){
        int cwWeighting=40;
        avgMarks[i]=(examMarks[i]*(100-cwWeighting)+courseworkmarks[i]*cwWeighting)/100;
        System.out.print(avgMarks[i] + "\t" );
    }
}

Answer 1

以下是如何在 JFreechart 中设置条形图值的基本示例，它可能会对您有所帮助，具体取决于您用于创建图表的库:

public class BarChartExample {
public static void main(String[] args) {
// Create a simple Bar chart

double[] dub = {12.2, 15.4, 18.3, 9.3, 7.7};    //Array 
String[] student = {"Bob", "Dave", "William", "Boris", "Rick"}; //Array

DefaultCategoryDataset dataset = new DefaultCategoryDataset(); //Create dataset
for(int i = 0; i < dub.length; i++){
dataset.setValue(dub[i], "Marks", student[i]); //Setting the values
}

JFreeChart chart = ChartFactory.createBarChart3D("Goal comparison",
"Marks", "Students", dataset, PlotOrientation.VERTICAL,
false, true, false); //Chart creation
try {
ChartUtilities.saveChartAsJPEG(new File("D:\\Users\\user2777005\\Desktop\\Barchart.jpg"), chart,     500, 300);
} catch (IOException e) {
System.err.println("Problem occurred creating chart.");
}}}

祝你好运!