class CustomSecurityManager extends SecurityManager {
public CustomSecurityManager() {
super();
}
public void checkRead(String fileName) {
if (fileName != null && fileName.endsWith(".java")) {
throw new SecurityException(" You are not allowed to read " + " file names ending with .java");
}
super.checkRead(fileName);
}
public void checkWrite(String fileName) {
if (fileName != null && fileName.endsWith(".java")) {
throw new SecurityException(" You are not allowed to write "
+ " file names ending with .java");
}
super.checkWrite(fileName);
}
public void checkDelete(String fileName) {
if (fileName != null && fileName.endsWith(".java")) {
throw new SecurityException(" You are not allowed to delete "
+ " file names ending with .java");
}
super.checkDelete(fileName);
}
}
public class MainClass {
public static void main() {
System.setSecurityManager(new CustomSecurityManager());
SecurityManager secMgr = System.getSecurityManager();
if (secMgr != null) {
secMgr.checkRead("fileName");
}
}
}