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public void readSensitiveFile() {
  try {
    SecurityManager sm = System.getSecurityManager();
    if(sm != null) {  // check if file can be read
      sm.checkRead("/temp/tempFile");
      // access the file
    } 
  } catch (SecurityException se) { /* log exception */ }
}

public final void readSensitiveFile() {
  try {
    SecurityManager sm = System.getSecurityManager();
    if(sm != null) {  // check if file can be read
      sm.checkRead("/temp/tempFile");
      // access the file
    } 
  } catch (SecurityException se) { /* log exception */ }
}

private void readSensitiveFile() {
  try {
    SecurityManager sm = System.getSecurityManager();
    if(sm != null) {  // check if file can be read
      sm.checkRead("/temp/tempFile");
      // access the file
    } 
  } catch (SecurityException se) { /* log exception */ }
}