使用lombok @getter和@setter来简化方法

This is my original class.

这是我原来的课程。

public class HierarchyTreeNode {
    private String label;
    private List<HierarchyTreeNode> children;

    public String getLabel() {
        return label;
    }

    public void setLabel(String label) {
        this.label = label;
    }

    public List<HierarchyTreeNode> getChildren() {
        return children;
    }

    public void addChild(HierarchyTreeNode child) {
        if (children == null) {
            children = new ArrayList<>();
        }
        children.add(child);
    }
}
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