Description: Any one of 5 digits, for example: 34256, put i n the number you are upset, rearrange, can get a maximum number: 65432, a minimum number of 23456. The sum of the two numbers, have: 41976, put the digital repeat the above process (if less than 5, the front 0). So back and forth, digital will fall into a circle (called digital black hole).
For example, just numbers will fall into: [82962, 75933, 63954, the 61974] cycle.
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File list (Check if you may need any files):
FiveNum.java
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