import java.util.List;

public class EChartsLineChart {
    private List<String> xAxisData;
    private List<LineSeries> series;

    // 构造函数、getter 和 setter 方法

    // 内部类表示折线图中的系列
    public static class LineSeries {
        private String name;
        private List<Integer> data;

        // 构造函数、getter 和 setter 方法
    }
}

private static EChartsLineChart buildEChartsData() {
    EChartsLineChart echartsData = new EChartsLineChart();

    // 设置 xAxisData
    echartsData.setXAxisData(List.of("1", "3"));

    // 设置 Series
    LineSeries series = new LineSeries();
    series.setName("123");
    series.setData(List.of(1, 2, 3));

    echartsData.setSeries(List.of(series));

    return echartsData;
}