Java 数据结构之通用菜单

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本实例是实现菜单的多级选择：

实现代码如下：

package menuTest;import java.util.List;import java.util.Scanner;import generalTree.GeneralTree;public class controlMenu {GeneralTree tree = new GeneralTree();public void add(String parent,String child){tree.addNode(parent,child);}public String go(String x){Scanner scan = new Scanner(System.in);String x2 = x;for(;;){List<String> t = tree.getChild(x);if(t.isEmpty()) return x;System.out.println("----------");for(int i=0; i<t.size();i++){System.out.println(i+"."+t.get(i));}System.out.println("u.返回上一级菜单");System.out.println("f.返回第一级菜单");System.out.println("----------");System.out.print("请输入：");String s = scan.nextLine();if(s.equals("u")){String x1 = tree.getParent(x);if(x1 != null) x=x1;continue;}if(s.equals("f")){x = "水果";continue;}//continue;try{String x1 = t.get(Integer.parseInt(s));x = x1;}catch(Exception e){System.out.println("请从新输入！！！");}}}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubcontrolMenu fruit = new controlMenu();fruit.add("水果","苹果");fruit.add("水果","香蕉");fruit.add("水果","葡萄");fruit.add("苹果","红富士");fruit.add("苹果","国光苹果");fruit.add("国光苹果","富强1号");fruit.add("国光苹果","富强2号");String t = fruit.go("水果");System.out.println("选择："+t);}}

其中的GeneralTree类，见前一篇文章里面。

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