LeetCode——Simplify Path

public class SimplifyPath {
	public static void main(String[] args) {
		String ret = new SimplifyPath().simplifyPath("/a/./b/../../c/");
		System.out.println("result:"+ret);
	}
	public String simplifyPath(String path) {
		String[] params = path.split("/");
		Stack<String> stack = new Stack<String>();
		for(String param : params){
			if(param.equals(".."))
				stack.pop();
			else if(!param.equals("..") && !param.equals(".") && !param.equals(""))
				stack.push(param);
		}
		StringBuilder builder = new StringBuilder();
		for(String str :stack)
			builder.append("/"+str);
		return stack.isEmpty() ? "/":builder.toString();
	}
}