android 45多線程

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Thread thread=new Thread(new Runnable()
        {
            @Override
            public void run() {
                while (true) {
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    Log.e("1111", "111111111");
                    // TODO Auto-generated method stub

                }
            }
        });
        thread.start();

        Thread thread2=new Thread(new Runnable()
        {
            @Override
            public void run()
            {
                    while(true){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    Log.e("2222", "222222222");
                    // TODO Auto-generated method stub

                }
            }
        });
        thread2.start();
    }
}