public class TestSingletonSynchronized implements java.lang.Runnable {
Thread thread;
public static void main(String args[]) {
TestSingletonSynchronized t = new TestSingletonSynchronized();
}
public TestSingletonSynchronized() {
SynchronizedData database = SynchronizedData.getInstance("products");
thread = new Thread(this, "second");
thread.start();
System.out.println("This is the " + database.getName() + " database.");
}
public void run() {
SynchronizedData database = SynchronizedData
.getInstance("employees");
System.out.println("This is the " + database.getName() + " database.");
}
}
class SynchronizedData {
private static SynchronizedData singleObject;
private int record;
private String name;
private SynchronizedData(String n) {
name = n;
record = 0;
}
public static synchronized SynchronizedData getInstance(String n) {
if (singleObject == null) {
singleObject = new SynchronizedData(n);
}
return singleObject;
}
public void edit(String operation) {
System.out.println("Performing a " + operation + " operation on record "
+ record + " in database " + name);
}
public String getName() {
return name;
}
}