File Input Output Java

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import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
public class Main {
  public static void main(String[] argv) throws Exception {
    File temp = File.createTempFile("pattern", ".dat");
    temp.deleteOnExit();
    BufferedWriter out = new BufferedWriter(new FileWriter(temp));
    out.write("asdf");
    out.close();
  }
}