demo-multi-module/common/src/main/java/net/rzdata/demo/trait/TreeNode.java

package net.rzdata.demo.trait;

import java.util.List;

public interface TreeNode<T extends TreeNode<T, ID>, ID> {

    ID getId();

    ID getParentId();

    List<T> getChildren();

    void setChildren(List<T> children);

    default boolean isLeaf() {
        return getChildren() == null;
    }
}