Don't extend Thread (1/n)

import java.util.List;

/** This class calls its monitor every minute. Killing this process if they don't return **/

public class Watchdog extends Thread {

public class Watchdog {

    static final String TAG = "Watchdog";

    /** Debug flag. */

    private static Watchdog sWatchdog;

    private final Thread mThread;

    /* This handler will be used to post message back onto the main thread */

    private final ArrayList<HandlerChecker> mHandlerCheckers = new ArrayList<>();

    private final HandlerChecker mMonitorChecker;

    }

    private Watchdog() {

        super("watchdog");

        mThread = new Thread(this::run, "watchdog");

        // Initialize handler checkers for each common thread we want to check.  Note

        // that we are not currently checking the background thread, since it can

        // potentially hold longer running operations with no guarantees about the timeliness

                DEFAULT_TIMEOUT > ZygoteConnectionConstants.WRAPPED_PID_TIMEOUT_MILLIS;

    }

    /**

     * Called by SystemServer to cause the internal thread to begin execution.

     */

    public void start() {

        mThread.start();

    }

    /**

     * Registers a {@link BroadcastReceiver} to listen to reboot broadcasts and trigger reboot.

     * Should be called during boot after the ActivityManagerService is up and registered

        return pids;

    }

    @Override

    public void run() {

    private void run() {

        boolean waitedHalf = false;

        while (true) {

            final List<HandlerChecker> blockedCheckers;