// : c13:SyncObject.java
// Synchronizing on another object
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
class DualSynch {
private Object syncObject = new Object();
public synchronized void f() {
System.out.println("Inside f()");
// Doesn't release lock:
try {
Thread.sleep(500);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
System.out.println("Leaving f()");
}
public void g() {
synchronized (syncObject) {
System.out.println("Inside g()");
try {
Thread.sleep(500);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
System.out.println("Leaving g()");
}
}
}
public class SyncObject {
public static void main(String[] args) {
final DualSynch ds = new DualSynch();
new Thread() {
public void run() {
ds.f();
}
}.start();
ds.g();
}
} ///:~