try-with-resources Statement
Java 7 added a new feature try-with-resources that automates resource management.
It looks like this :
try (Resource r1 = new Resource("resource1"); Resource r2 = new Resource("resource1")) {
// use the resource
}
When the try block ends, the resource is automatically released.
Example :
private void readFile() throws IOException { int i; try (FileInputStream fin = new FileInputStream("in.txt");) { do { i = fin.read(); if (i != -1) { System.out.println((char) i); } } while (i != -1); } }
Java 9 enhancement for try-with-resources
Java 9 introduced an enhancement where if the resource is referenced by a final or effectively final variable, try-with-resources statement doesn’t need a new variable being declared.
Resource r1 = new Resource("resource1");
Resource r1 = new Resource("resource1");
try (r1;r2) {
// use the resource
}
Example :
private void readFile() throws IOException{ int i; FileInputStream fin = new FileInputStream("in.txt"); try(fin){ do{ i = fin.read(); if(i!=-1){ System.out.println((char)i); } }while(i!=-1); } }
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