With JAVA language randomly selected 4 cards, and 20, with a random number function traversal

RandomCards\.classpath
...........\.project
...........\.settings\org.eclipse.jdt.core.prefs
...........\bin\cn\edu\jxufe\wengfei\RandomCards.class
...........\src\cn\edu\jxufe\wengfei\RandomCards.java
...........\bin\cn\edu\jxufe\wengfei
...........\src\cn\edu\jxufe\wengfei
...........\bin\cn\edu\jxufe
...........\src\cn\edu\jxufe
...........\bin\cn\edu
...........\src\cn\edu
...........\bin\cn
...........\src\cn
...........\.settings
...........\bin
...........\src
RandomCards

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