// exceptions/EffectivelyFinalTWR.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// {NewFeature} Since JDK 9

import java.io.*;

public class EffectivelyFinalTWR {

static void old() {

try (

InputStream r1 = new FileInputStream(

new File("TryWithResources.java"));

InputStream r2 = new FileInputStream(

new File("EffectivelyFinalTWR.java"));

) {

r1.read();

r2.read();

} catch(IOException e) {

// Handle exceptions

}

}

static void jdk9() throws IOException {

final InputStream r1 = new FileInputStream(

new File("TryWithResources.java"));

// Effectively final:

InputStream r2 = new FileInputStream(

new File("EffectivelyFinalTWR.java"));

try (r1; r2) {

r1.read();

r2.read();

}

// r1 and r2 are still in scope. Accessing

// either one throws an exception:

r1.read();

r2.read();

}

public static void main(String[] args) {

old();

try {

jdk9();

} catch(IOException e) {

System.out.println(e);

}

}

}

/* Output:

java.io.IOException: Stream Closed

*/