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实现扑克牌，一副牌中抽去大小王剩下52张（如果初练也可只用1～10这40张牌)，任意抽取4张牌（称牌组)，用加、减、乘、除（可加括号)把牌面上的数算成24。每张牌必须用一次且只能用一次，如抽出的牌是3、8、8、9，那么算式为（9-8)×8×3或3×8+（9-8)或（9- 8÷8)×3等。(In order to realize playing cards, 52 cards are removed from a deck (only 40 cards can be used for the first practice). Four cards are randomly selected (called card groups). The number on the deck is calculated as 24 by adding, subtracting, multiplying and dividing (brackets can be added). Each card must be used once and only once. If the drawn card is 3, 8, 8, 9, the formula is (9-8)*8*3 or 3*8+ (9-8) or (9-8 8)*3)

将一个图片进行裁剪成指定大小的图片, 现在很多网站有这个程序来裁剪头像(Cutting a picture into a specified size of image, Now many sites have this procedure to cutting head)

实现双向的seekbar,可以左右的拖动进度条(Achieve bidirectional seekbar)

安卓listview+radiobutton的小例子，可运行，有安卓基础的很容易上手( U5B89 u5353listview+radiobutton u7684 u5C0F u4B0F u5B50 uFF0C u53EF u8FD0 u884C uFF0C u6709 u5B89 u5353 u57FA u7840 u7684 u5F88 u5BB9 u6613 u4E0A u624B)

java版本 内网穿透，可以用于微信开发，vpn搭建(Java version of Intranet penetration, can be used for Wechat development, VPN building)

说明：  智慧城市android版本源码共享,可试用修改(Smart City Source Sharing)

apk sample. kingdom rush

free fall menu java script

利用动态规划法，求出字符串A变为字符串B的最小操作数。（每次只能操作一个字符）(Find the minimum operand that turns string A into string B)

一个java的万年历程序，在编程信息栏显示(A java calendar program, the programming information bar)