拆分字符串为树形结构

package test;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
/**
*拆分目录结构，这里拆分用小数点代替。
*
*/
public class RenameFile {
    public static void main(String[] args) throws IOException {
        List<String> rootStrs = new ArrayList<String>();
        rootStrs.add("c.a.b.c");
        rootStrs.add("d.a.b.c");
        rootStrs.add("c.a.c.c");
        rootStrs.add("c.b.b.c.1");
        Dir root = new Dir("root");
        
        for(String rootStr : rootStrs){
            List<Dir> eachList = null;
            for(String str: rootStr.split("\\.")){
                if(eachList == null){
                    eachList = root.getChild();
                }
                eachList = creatChild(str,eachList);
            }
        }

        
    }
    
    
    private static List<Dir>  creatChild(String str,List<Dir> child){
        //如果已经存在
        for(Dir dirEle:child){
            if(dirEle.getName().equals(str)){
                return dirEle.getChild();
            }
        }
         Dir dir = new Dir(str);
         child.add(dir);
         return  dir.getChild();
    }
    
}

class Dir{
    String name;
    List<Dir> child = new ArrayList<Dir>();
    Dir(String name){
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<Dir> getChild() {
        return child;
    }
    public void setChild(List<Dir> child) {
        this.child = child;
    }
    
}