Synchronized Block demo
public class SyncBlock extends Object {
private Object longLock;
public SyncBlock() {
longLock = new Object();
}
public void doStuff() {
print("about to try to get exclusive access " + "to longLock");
synchronized (longLock) {
print("got exclusive access to longLock");
try {
Thread.sleep(10000);
} catch (InterruptedException x) {
}
print("about to relinquish exclusive access to " + "longLock");
}
}
private static void print(String msg) {
String name = Thread.currentThread().getName();
System.err.println(name + ": " + msg);
}
private static Thread launch(final SyncBlock sb, String name) {
Runnable r = new Runnable() {
public void run() {
print("in run()");
sb.doStuff();
}
};
Thread t = new Thread(r, name);
t.start();
return t;
}
public static void main(String[] args) {
try {
SyncBlock sb = new SyncBlock();
Thread t1 = launch(sb, "T1");
Thread.sleep(500);
Thread t2 = launch(sb, "T2");
Thread t3 = launch(sb, "T3");
Thread.sleep(1000);
print("about to interrupt T2");
t2.interrupt();
print("just interrupted T2");
} catch (InterruptedException x) {
x.printStackTrace();
}
}
}
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