Android的Activity切换

package com.example.yj;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {

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

    public void OnClkRegist(View v)
    {
        Toast.makeText(this, "Regist", Toast.LENGTH_SHORT).show();
        ///Toast.makeText(this, "hahaha", )
        Intent intent = new Intent();
        intent.setClass(this, RegistActivity.class);
        startActivity(intent);
        this.finish();
    }

    public void OnLogin(View v)
    {

    }

    public void OnAbout()
    {

    }
}