qq_35661734的博客

获取系统临时目录String folder=System.getProperty(“java.io.tmpdir”);创建临时目录File file =new File(folder); if (!file .exists() && !file .isDirectory()) { System.out.println(“//不存在”); file .mkdir();

//简单枚举实例public class demo2 {        public enum color{        red,blue,yellow    };    public static void main(String[] args) {    color co = color.red;    switch (co) {    case re

//简单枚举实例public class demo2 { public enum color{ red,blue,yellow };public static void main(String[] args) { color co = color.red; switch (co) { case red: co=color.blue