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/* package whatever; // don't place package name! */
 
import android.os.Bundle;
import android.util.Log;
 
import androidx.appcompat.app.AppCompatActivity;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.time.LocalDateTime;
 
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        LocalDateTime date = LocalDateTime.now();
        String data;
        while (true) {
            try {
                String str_date = String.valueOf(date);
                date = LocalDateTime.now();
                Thread.sleep(100);
                String str_change_date = str_date.replace("T", " ");
                String[] args = {"logcat", "-T", str_change_date, "-e", "^hogehoge"};//実際には抽出したい文字列が入ります
                Log.println(Log.ASSERT,"hogege","hogehoge");
                Process process = Runtime.getRuntime().exec(args);
                BufferedReader bufferedReader = new BufferedReader(
                        new InputStreamReader(process.getInputStream()));
                while ((data = bufferedReader.readLine()) != null) {
                      Log.w("foo", data);
                      Thread.sleep(100);
                    }
            } catch (IOException | InterruptedException ignored) {
            }
        }
    }
}

Main.java:13: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends AppCompatActivity {
       ^
Main.java:3: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:4: error: package android.util does not exist
import android.util.Log;
                   ^
Main.java:6: error: package androidx.appcompat.app does not exist
import androidx.appcompat.app.AppCompatActivity;
                             ^
Main.java:13: error: cannot find symbol
public class MainActivity extends AppCompatActivity {
                                  ^
  symbol: class AppCompatActivity
Main.java:15: error: cannot find symbol
    protected void onCreate(Bundle savedInstanceState) {
                            ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:14: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:16: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:27: error: cannot find symbol
                Log.println(Log.ASSERT,"hogege","hogehoge");
                            ^
  symbol:   variable Log
  location: class MainActivity
Main.java:27: error: cannot find symbol
                Log.println(Log.ASSERT,"hogege","hogehoge");
                ^
  symbol:   variable Log
  location: class MainActivity
Main.java:32: error: cannot find symbol
                      Log.w("foo", data);
                      ^
  symbol:   variable Log
  location: class MainActivity
11 errors

Standard output is empty