Android Activity Declaration : I am working on App lock Application in android , the error I am facing is 
Utils.java


    public class Util {
    public static void Job(Context con){
        ComponentName service=new ComponentName(con,AppsService.class);
        JobInfo.Builder build=new JobInfo.Builder(0,service);
        build.setMinimumLatency(1*1000);
        build.setOverrideDeadline(3*1000);
        build.setRequiresCharging(false);
        JobScheduler schedule=con.getSystemService(JobScheduler.class);
        schedule.schedule(build.build());
    }
    }

LockActivity.java

    
    public class LockActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lock);
        final TextInputEditText pass=(TextInputEditText) findViewById(R.id.etPassword);
        Button submit=(Button) findViewById(R.id.submit_button);
        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String password=pass.getText().toString();
                DataBase data=DataBase.getInstance(LockActivity.this);
                data.insertPass(password);
                pass.setText("");
                Intent i=new Intent(LockActivity.this,Util.class);
                startActivity(i);
            }
        });
    }
    }

error is : android.content.ActivityNotFoundException: Unable to find explicit activity class {com.darkweb.android.applock/com.darkweb.android.applock.Util}; have you declared this activity in your AndroidManifest.xml?
                                                                                 
 at com.darkweb.android.applock.LockActivity$1.onClick(LockActivity.java:33)

#Line 33 includes = Intent method
