Java access control, assign the appropriate permissions for Java operating files, write files, define the information written to the file definition file, output to c :/ hello.txt write information to a file, close the output stream.

Java访问权限控制\16720.gif
................\89-1.bmp
................\89-2.bmp
................\89-3.bmp
................\PolicyExample.class
................\PolicyExample.java
................\read.txt
Java访问权限控制

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