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How to declare multiple resources in a try-with-resources statement in Java 9?
Try-with-resources statement has been improved in Java 9. If we already have a resource that is final or equivalent to the final variable, then we can use that variable in a try-with-resources statement without having to declare a new variable in a try-with-resources statement.
We can declare multiple resources in a try block. Try initialization block can have any number of resources resulting in either null or non-null resources.
In the below example, we can able to declare multiple resources in the try-with-resources statement.
Example
import java.io.BufferedReader; import java.io.IOException; import java.io.Reader; import java.io.StringReader; public class MultipleResourcesTest { public static void main(String args[]) throws IOException { System.out.println(readData("test")); } static String readData(String message) throws IOException { try(Reader inputString = new StringReader(message); BufferedReader br = new BufferedReader(inputString)) { return br.readLine(); } } }
Output
test
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