Use Objects.requireNonNull().

app/src/main/java/org/schabi/newpipe/about/LicenseFragment.java

@@ -19,6 +19,7 @@
 import java.io.Serializable;
 import java.util.Arrays;
 import java.util.Comparator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 
@@ -35,12 +36,10 @@ public class LicenseFragment extends Fragment {
     private final CompositeDisposable compositeDisposable = new CompositeDisposable();
 
     public static LicenseFragment newInstance(final SoftwareComponent[] softwareComponents) {
-        if (softwareComponents == null) {
-            throw new NullPointerException("softwareComponents is null");
-        }
         final LicenseFragment fragment = new LicenseFragment();
         final Bundle bundle = new Bundle();
-        bundle.putParcelableArray(ARG_COMPONENTS, softwareComponents);
+        bundle.putParcelableArray(ARG_COMPONENTS, Objects.requireNonNull(softwareComponents,
+                "softwareComponents is null"));
         fragment.setArguments(bundle);
         return fragment;
     }

app/src/main/java/us/shandian/giga/get/DownloadMission.java

@@ -22,6 +22,7 @@
 import java.net.URL;
 import java.net.UnknownHostException;
 import java.nio.channels.ClosedByInterruptException;
+import java.util.Objects;
 
 import javax.net.ssl.SSLException;
 
@@ -154,8 +155,8 @@ public class DownloadMission extends Mission {
     public transient Thread init = null;
 
     public DownloadMission(String[] urls, StoredFileHelper storage, char kind, Postprocessing psInstance) {
-        if (urls == null) throw new NullPointerException("urls is null");
-        if (urls.length < 1) throw new IllegalArgumentException("urls is empty");
+        if (Objects.requireNonNull(urls, "urls is null").length < 1)
+            throw new IllegalArgumentException("urls is empty");
         this.urls = urls;
         this.kind = kind;
         this.offsets = new long[urls.length];

app/src/main/java/us/shandian/giga/get/DownloadRunnable.java

@@ -8,6 +8,7 @@
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.nio.channels.ClosedByInterruptException;
+import java.util.Objects;
 
 import us.shandian.giga.get.DownloadMission.Block;
 import us.shandian.giga.get.DownloadMission.HttpError;
@@ -29,8 +30,7 @@ public class DownloadRunnable extends Thread {
     private HttpURLConnection mConn;
 
     DownloadRunnable(DownloadMission mission, int id) {
-        if (mission == null) throw new NullPointerException("mission is null");
-        mMission = mission;
+        mMission = Objects.requireNonNull(mission, "mission is null");
         mId = id;
     }
 

app/src/main/java/us/shandian/giga/get/sqlite/FinishedMissionStore.java

@@ -12,6 +12,7 @@
 
 import java.io.File;
 import java.util.ArrayList;
+import java.util.Objects;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
@@ -140,9 +141,8 @@ private ContentValues getValuesOfMission(@NonNull Mission downloadMission) {
     }
 
     private FinishedMission getMissionFromCursor(Cursor cursor) {
-        if (cursor == null) throw new NullPointerException("cursor is null");
-
-        String kind = cursor.getString(cursor.getColumnIndex(KEY_KIND));
+        String kind = Objects.requireNonNull(cursor, "cursor is null")
+                .getString(cursor.getColumnIndex(KEY_KIND));
         if (kind == null || kind.isEmpty()) kind = "?";
 
         String path = cursor.getString(cursor.getColumnIndexOrThrow(KEY_PATH));
@@ -186,15 +186,14 @@ public ArrayList<FinishedMission> loadFinishedMissions() {
     }
 
     public void addFinishedMission(DownloadMission downloadMission) {
-        if (downloadMission == null) throw new NullPointerException("downloadMission is null");
         SQLiteDatabase database = getWritableDatabase();
-        ContentValues values = getValuesOfMission(downloadMission);
+        ContentValues values = getValuesOfMission(Objects.requireNonNull(downloadMission,
+                "downloadMission is null"));
         database.insert(FINISHED_TABLE_NAME, null, values);
     }
 
     public void deleteMission(Mission mission) {
-        if (mission == null) throw new NullPointerException("mission is null");
-        String ts = String.valueOf(mission.timestamp);
+        String ts = String.valueOf(Objects.requireNonNull(mission, "mission is null").timestamp);
 
         SQLiteDatabase database = getWritableDatabase();
 
@@ -212,9 +211,9 @@ public void deleteMission(Mission mission) {
     }
 
     public void updateMission(Mission mission) {
-        if (mission == null) throw new NullPointerException("mission is null");
         SQLiteDatabase database = getWritableDatabase();
-        ContentValues values = getValuesOfMission(mission);
+        ContentValues values = getValuesOfMission(Objects.requireNonNull(mission,
+                "mission is null"));
         String ts = String.valueOf(mission.timestamp);
 
         int rowsAffected;

app/src/main/java/us/shandian/giga/io/CircularFileWriter.java

@@ -7,6 +7,7 @@
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.util.Objects;
 
 public class CircularFileWriter extends SharpStream {
 
@@ -27,9 +28,7 @@ public class CircularFileWriter extends SharpStream {
     private BufferedFile aux;
 
     public CircularFileWriter(SharpStream target, File temp, OffsetChecker checker) throws IOException {
-        if (checker == null) {
-            throw new NullPointerException("checker is null");
-        }
+        Objects.requireNonNull(checker, "checker is null");
 
         if (!temp.exists()) {
             if (!temp.createNewFile()) {