Name: bsC130419 Date: 07/27/2001


C:\java>java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b65)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b65, mixed mode)

C:\java>

Here's the test program:

import java.util.prefs.*;

public class Foo {

    public Foo() {
        long t1 = System.currentTimeMillis();
        Preferences preferences = Preferences.userNodeForPackage(this);
        long t2 = System.currentTimeMillis();
        String preference = preferences.get("somekey", "default");
        long t3 = System.currentTimeMillis();
        preferences.put("somekey", "value");
        long t4 = System.currentTimeMillis();
        preference = preferences.get("somekey", "default");
        long t5 = System.currentTimeMillis();
        try {
            preferences.flush();
        } catch (BackingStoreException e) {
            e.printStackTrace();
            return;
        }
        long t6 = System.currentTimeMillis();
        preference = preferences.get("somekey", "default");
        long t7 = System.currentTimeMillis();
        preference = preferences.get("somekey", "default");
        long t8 = System.currentTimeMillis();
        preference = preferences.get("someOtherKey", "default");
        long t9 = System.currentTimeMillis();
        preference = preferences.get("someOtherKey", "default");
        long t10 = System.currentTimeMillis();
 
        System.out.println(t2 - t1 + "\t(userNodeForPackage)");
        System.out.println(t3 - t2 + "\t(get)");
        System.out.println(t4 - t3 + "\t(put)");
        System.out.println(t5 - t4 + "\t(get)");
        System.out.println(t6 - t5 + "\t(flush)");
        System.out.println(t7 - t6 + "\t(get)");
        System.out.println(t8 - t7 + "\t(get)");
        System.out.println(t9 - t8 + "\t(get)");
        System.out.println(t10 - t9 + "\t(get)");
    }

    public static void main(String[] args) {
        Foo f = new Foo();
    }
}

Here's the output from the first time it runs (without any preferences)...

C:\java>java Foo
60 (userNodeForPackage)
1552 (get)
0 (put)
0 (get)
250 (flush)
0 (get)
0 (get)
1552 (get)
1553 (get)

C:\java>

And here's the output from the second run (with the somekey preference now
existing)...

C:\java>java Foo
60 (userNodeForPackage)
0 (get)
0 (put)
0 (get)
0 (flush)
0 (get)
0 (get)
1552 (get)
1552 (get)
(Review ID: 128927)
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