public class Main { public static void main(String[] argv) throws Exception {
File file1 = new File("a");
File file2 = new File("a");
File file3 = new File("b");
int ihc1 = System.identityHashCode(file1);
System.out.println(ihc1); int ihc2 = System.identityHashCode(file2);
System.out.println(ihc2); int ihc3 = System.identityHashCode(file3);
System.out.println(ihc3);