java 实现字符串转换为树
2022/8/29 1:22:52
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import java.util.*; class Node { public static void main(String[] args) { ArrayList<String> listOfPaths = new ArrayList<String>(); listOfPaths.add("主要材料|钢铁|锌铜板"); listOfPaths.add("主要材料|通风口|cc"); listOfPaths.add("主要材料|压路机"); listOfPaths.add("主要材料|加药装置"); listOfPaths.add("主要材料|加药装置1"); listOfPaths.add("主要材料|钢铁"); listOfPaths.add("主要材料|钢铁|锌铜板1"); listOfPaths.add("工程设备|钢铁|锌铜板"); TreeMap structure = new TreeMap<>(); for (String path : listOfPaths) { String[] tmp = path.split("\\|", 2); // [ "folder a/", "folder b/file 1"] for first loops step String way = ""; put(structure, tmp[0], tmp[1], way); } List<Material> materials = new ArrayList<>(); print(structure, "", materials); System.out.println(Arrays.toString(materials.toArray())); } private static void put(TreeMap structure, String root, String rest, String way) { String[] tmp = rest.split("\\|", 2); TreeMap rootDir = (TreeMap) structure.get(root); if (rootDir == null) { rootDir = new TreeMap(); structure.put(root, rootDir); } if (tmp.length == 1) { // path end rootDir.put(tmp[0], null); } else { put(rootDir, tmp[0], tmp[1], way); } } private static void print(TreeMap map, String way, List<Material> materials) { if (map == null || map.isEmpty()) return; String o = way; for (Object m : map.entrySet()) { Material material = new Material(); material.setName((String) ((Map.Entry) m).getKey()); material.setChildren(new ArrayList<>()); if (Objects.equals(way, "")) { way = (String) ((Map.Entry) m).getKey(); } else { way += "|" + (String) ((Map.Entry) m).getKey(); } material.setWay(way); materials.add(material); print((TreeMap) ((Map.Entry) m).getValue(), way, material.getChildren()); way = o; } } }
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