tsk12.java

package a;

import lombok.SneakyThrows;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

@SpringBootApplication
public class tsk12 {
 static String __arg1;
 static String __arg2;

 public static void main(String[] args) {
 //noinspection ConstantConditions
 final var a = tsk12
 .class
 .getClassLoader()
 .getResource(".")
 .getPath();

 __arg1 = a + "/a.txt"; // args[0]
 __arg2 = a + "/b.hash"; // args[1]

 SpringApplication.run(tsk12.class, args);
 }

 @Component
 public static class A {
 final File a = new File(__arg1);
 final File b = new File(__arg2);

 @SuppressWarnings("StringConcatenationInLoop")
 @SneakyThrows
 @PostConstruct
 public void st() {
 var c = "";
 var e = a.exists();
 if (e) {
 final var r = new FileReader(a);
 var d = 0;

 while ((d = r.read()) != -1)
 c += (char) d;
 r.close();
 } else c = "null";

 assert b.exists() || b.createNewFile();

 final var w = new FileWriter(b);
 w.write(String.valueOf(e ? c.hashCode() : c));
 w.close();
 }

 @SuppressWarnings("ResultOfMethodCallIgnored")
 @PreDestroy public void en() { a.delete(); }
 }
}