java - 创建java函数来重复添加对象

Question

所需的输出如下所示。让节点类在最后被序列化，以便将类转换为 json 字符串，但问题是该过程需要循环而不是硬编码。

 {"name":"Main","nodes":[{"name":"Tree","nodes":[{"name":"Branch","nodes":[{"name":"Stick","nodes":[{"name":"Leaf"}]}]}]}]}

我正在尝试循环执行此过程，这样我就不会手动将所有对象相互添加。

    Node mainNode = new Node();
    mainNode.setName("Main");
    String directory = "Tree/Branch/Stick/Leaf";
    Node n1 = new Node();
    n1.setName("Tree");
    Node n2 = new Node();
    n2.setName("Branch");
    Node n3 = new Node();
    n3.setName("Stick");
    Node n4 = new Node();
    n4.setName("Leaf");

    n3.addNode(n4);
    n2.addNode(n3);
    n1.addNode(n2);
    mainNode.addNode(n1);

    Gson gson = new Gson();
    logger.info(gson.toJson(mainNode));

节点类

public class Node {
  public String name;
  public Node[] nodes;

  public Node(){}
  public Node(String name){
      this.name = name;
  }
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Node[] getNodes() {
    return nodes;
}
public void setNodes(Node[] nodes) {
    this.nodes = nodes;
}
public void addNode(Node node){
    this.nodes = (Node[]) ArrayUtils.add(this.nodes, node);
}

Answer 1

最好添加带有子节点的构造器:

Node(String name, Node child) {
    this.name = name;
    if (child != null) {
        addChild(child);
    }
}

并定义静态递归方法:

public static Node getNodeTree(String[] leaves) {
        if (leaves.length == 1) {
            return new Node(leaves[0]);
        }

        return new Node(leaves[0], getNodeTree(Arrays.copyOfRange(leaves, 1, leaves.length)));
    }

你会得到你想要的。并且不要忘记添加检查 leaves 是否为 null 或空数组。