Change a file attribute to read only

   
import java.io.File;

public class Main {
  public static void main(String[] args) throws Exception {
    File file = new File("ReadOnly.txt");
    file.createNewFile();
    file.setReadOnly();

    if (file.canWrite()) {
      System.out.println("writable!");
    } else {
      System.out.println("read only!");
    }
  }
}

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Change a file attribute to read only : Files « File Input Output « Java

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