Java中list转树的应用

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public class TreeNode {     private String id;     private String parentId;     private String name;     private List children;     public TreeNode(String id, String name, String parentId) {        this.id = id;        this.parentId = parentId;        this.name = name;    }    public TreeNode(String id, String name, TreeNode parent) {        this.id = id;        this.parentId = parent.getId();        this.name = name;    }      public String getParentId() {        return parentId;    }     public void setParentId(String parentId) {        this.parentId = parentId;    }     public String getName() {        return name;    }     public void setName(String name) {        this.name = name;    }     public String getId() {        return id;    }     public void setId(String id) {        this.id = id;    }     public List getChildren() {        return children;    }     public void setChildren(List children) {        this.children = children;    }     @Override    public String toString() {        return "TreeNode{" +                "id='" + id + '\'' +                ", parentId='" + parentId + '\'' +                ", name='" + name + '\'' +                ", children=" + children +                '}';    } }public class TreeBuilder {     /**     * 两层循环实现建树     * @param treeNodes 传入的树节点列表     * @return     */    public static List bulid(List treeNodes) {         List trees = new ArrayList();         for (TreeNode treeNode : treeNodes) {             if ("0".equals(treeNode.getParentId())) {                trees.add(treeNode);            }             for (TreeNode it : treeNodes) {                if (it.getParentId() == treeNode.getId()) {                    if (treeNode.getChildren() == null) {                        treeNode.setChildren(new ArrayList());                    }                    treeNode.getChildren().add(it);                }            }        }        return trees;    }}

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