Tutorial 39 Try-With-Resources

//Tutorial 39 Try-With-Resources
//this is a Java 7 language feature
//this feature gets rid of the nested tri-catch blocks all over the place in Reading Files with File Reader tutorial

//App.java
class Temp implements AutoCloseable { //step 1. AutoCloseable interface just specifies that you class should have a method called close

    @Override                        //step 1. now we have the close method here
    public void close() throws Exception {
        System.out.println("Closing!");
        throw new Exception("oh no!")
    }

}
public class App {

    public static void main(String[] args) {
        try(Temp temp = new Temp()){ //since Java 7 when can put it in try( ) like while( )

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}
//---------------------------------------------------------------------------------------------------------------------------------------
/*Run Results:
Closing!
java.lang.Exception: oh no!
    at Temp.close(App.java:10)
    at App.main(App.java:19)
*/




//How this works in regards to text files:
//App2.java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


public class App2 {
    public static void main(String[] args){
        File file = new File("text.txt");

        try(BufferedReader br = new BufferedReader( new FileReader(file))){

        } catch (FileNotFoundException e) {
            System.out.println("Can't find file: " + file.toString());
        } catch (IOException e) {
            System.out.println("Unable to read file: " + file.toString());
        }


    }
}
//this is much much more succinct then the mess we had last tutorial