BoolTimer.java

public class BoolTimer {

    private final long expire;

    private boolean b;
    private long time;

    public BoolTimer(long expire) {
        if (expire < 0) throw new IllegalArgumentException("Expiration cannot be negative");
        this.expire = expire;
    }

    public boolean get() {
        if (b && System.currentTimeMillis() - time > expire) {
            b = false;
        }
        return b;
    }

    public void set() {
        b = true;
        time = System.currentTimeMillis();
    }
}