diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java b/classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
index 094801130..f5b31f338 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TArrayList.java
@@ -18,13 +18,9 @@ package org.teavm.classlib.java.util;
 import java.util.Arrays;
 import org.teavm.classlib.java.io.TSerializable;
 import org.teavm.classlib.java.lang.*;
+import org.teavm.classlib.java.util.function.TUnaryOperator;
 import org.teavm.interop.Rename;
 
-/**
- *
- * @author Alexey Andreev
- * @param <E>
- */
 public class TArrayList<E> extends TAbstractList<E> implements TCloneable, TSerializable {
     private E[] array;
     private int size;
@@ -184,4 +180,11 @@ public class TArrayList<E> extends TAbstractList<E> implements TCloneable, TSeri
             throw new TIndexOutOfBoundsException();
         }
     }
+
+    @Override
+    public void replaceAll(TUnaryOperator<E> operator) {
+        for (int i = 0; i < size; ++i) {
+            array[i] = operator.apply(array[i]);
+        }
+    }
 }
diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java b/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
index 4a397b9ed..359ac5283 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java
@@ -18,6 +18,10 @@ package org.teavm.classlib.java.util;
 import java.lang.reflect.Array;
 import java.util.Objects;
 import java.util.RandomAccess;
+import java.util.function.IntFunction;
+import java.util.function.IntToDoubleFunction;
+import java.util.function.IntToLongFunction;
+import java.util.function.IntUnaryOperator;
 import org.teavm.classlib.java.lang.TClass;
 import org.teavm.classlib.java.lang.TComparable;
 import org.teavm.classlib.java.lang.TDouble;
@@ -1600,4 +1604,28 @@ public class TArrays extends TObject {
         }
         return new TArrayDoubleStreamImpl(array, startInclusive, endExclusive);
     }
+
+    public static <T> void setAll(T[] array, IntFunction<? extends T> generator) {
+        for (int i = 0; i < array.length; ++i) {
+            array[i] = generator.apply(i);
+        }
+    }
+
+    public static void setAll(int[] array, IntUnaryOperator generator) {
+        for (int i = 0; i < array.length; ++i) {
+            array[i] = generator.applyAsInt(i);
+        }
+    }
+
+    public static void setAll(long[] array, IntToLongFunction generator) {
+        for (int i = 0; i < array.length; ++i) {
+            array[i] = generator.applyAsLong(i);
+        }
+    }
+
+    public static void setAll(double[] array, IntToDoubleFunction generator) {
+        for (int i = 0; i < array.length; ++i) {
+            array[i] = generator.applyAsDouble(i);
+        }
+    }
 }
diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TLinkedList.java b/classlib/src/main/java/org/teavm/classlib/java/util/TLinkedList.java
index 569a38aca..2fa25925f 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TLinkedList.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TLinkedList.java
@@ -89,9 +89,6 @@ public class TLinkedList<E> extends TAbstractSequentialList<E> implements TDeque
 
     @Override
     public boolean offer(E e) {
-        if (e == null) {
-            throw new IllegalArgumentException("Element can't be null");
-        }
         Entry<E> entry = new Entry<>();
         entry.item = e;
         entry.next = firstEntry;
@@ -108,11 +105,10 @@ public class TLinkedList<E> extends TAbstractSequentialList<E> implements TDeque
 
     @Override
     public E remove() {
-        E elem = poll();
-        if (elem == null) {
+        if (isEmpty()) {
             throw new TNoSuchElementException();
         }
-        return elem;
+        return poll();
     }
 
     @Override
@@ -152,9 +148,6 @@ public class TLinkedList<E> extends TAbstractSequentialList<E> implements TDeque
 
     @Override
     public void addLast(E e) {
-        if (e == null) {
-            throw new IllegalArgumentException("Element can't be null");
-        }
         Entry<E> entry = new Entry<>();
         entry.item = e;
         entry.previous = lastEntry;
@@ -187,11 +180,10 @@ public class TLinkedList<E> extends TAbstractSequentialList<E> implements TDeque
 
     @Override
     public E removeLast() {
-        E elem = pollLast();
-        if (elem == null) {
+        if (isEmpty()) {
             throw new TNoSuchElementException();
         }
-        return elem;
+        return pollLast();
     }
 
     @Override
diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TList.java b/classlib/src/main/java/org/teavm/classlib/java/util/TList.java
index 0b8351d26..a8aae61ec 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TList.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TList.java
@@ -15,6 +15,8 @@
  */
 package org.teavm.classlib.java.util;
 
+import org.teavm.classlib.java.util.function.TUnaryOperator;
+
 public interface TList<E> extends TCollection<E> {
     boolean addAll(int index, TCollection<? extends E> c);
 
@@ -36,6 +38,13 @@ public interface TList<E> extends TCollection<E> {
 
     TList<E> subList(int fromIndex, int toIndex);
 
+    default void replaceAll(TUnaryOperator<E> operator) {
+        TListIterator<E> iter = listIterator();
+        while (iter.hasNext()) {
+            iter.set(operator.apply(iter.next()));
+        }
+    }
+
     default void sort(TComparator<? super E> c) {
         TCollections.sort(this, c);
     }
diff --git a/classlib/src/main/java/org/teavm/classlib/java/util/TObjects.java b/classlib/src/main/java/org/teavm/classlib/java/util/TObjects.java
index 7deab763b..fe405d927 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/util/TObjects.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/util/TObjects.java
@@ -52,6 +52,10 @@ public final class TObjects extends TObject {
         return obj;
     }
 
+    public static boolean nonNull(Object obj) {
+        return obj != null;
+    }
+
     public static boolean deepEquals(Object a, Object b) {
         if (a == b) {
             return true;