diff --git a/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/MathArraysTest.java b/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/MathArraysTest.java
index aa71a74..0a95cb0 100644
--- a/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/MathArraysTest.java
+++ b/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/MathArraysTest.java
@@ -246,57 +246,57 @@
 
     @Test
     public void testIsMonotonicComparable() {
-        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {new Double(-15),
-                                                                new Double(-5.5),
-                                                                new Double(-1),
-                                                                new Double(-1),
-                                                                new Double(2),
-                                                                new Double(15) },
+        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {Double.valueOf(-15),
+                                                                Double.valueOf(-5.5),
+                                                                Double.valueOf(-1),
+                                                                Double.valueOf(-1),
+                                                                Double.valueOf(2),
+                                                                Double.valueOf(15) },
                 MathArrays.OrderDirection.INCREASING, true));
-        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {new Double(-15),
-                                                               new Double(-5.5),
-                                                               new Double(-1),
-                                                               new Double(0),
-                                                               new Double(2),
-                                                               new Double(15) },
+        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {Double.valueOf(-15),
+                                                               Double.valueOf(-5.5),
+                                                               Double.valueOf(-1),
+                                                               Double.valueOf(0),
+                                                               Double.valueOf(2),
+                                                               Double.valueOf(15) },
                 MathArrays.OrderDirection.INCREASING, true));
-        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {new Double(-15),
-                                                                new Double(-5.5),
-                                                                new Double(-1),
-                                                                new Double(-2),
-                                                                new Double(2) },
+        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {Double.valueOf(-15),
+                                                                Double.valueOf(-5.5),
+                                                                Double.valueOf(-1),
+                                                                Double.valueOf(-2),
+                                                                Double.valueOf(2) },
                 MathArrays.OrderDirection.INCREASING, false));
-        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {new Double(-15),
-                                                               new Double(-5.5),
-                                                               new Double(-1),
-                                                               new Double(-1),
-                                                               new Double(2) },
+        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {Double.valueOf(-15),
+                                                               Double.valueOf(-5.5),
+                                                               Double.valueOf(-1),
+                                                               Double.valueOf(-1),
+                                                               Double.valueOf(2) },
                 MathArrays.OrderDirection.INCREASING, false));
-        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {new Double(3),
-                                                                new Double(3),
-                                                                new Double(-5.5),
-                                                                new Double(-11),
-                                                                new Double(-27.5) },
+        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {Double.valueOf(3),
+                                                                Double.valueOf(3),
+                                                                Double.valueOf(-5.5),
+                                                                Double.valueOf(-11),
+                                                                Double.valueOf(-27.5) },
                 MathArrays.OrderDirection.DECREASING, true));
-        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {new Double(3),
-                                                               new Double(2),
-                                                               new Double(-5.5),
-                                                               new Double(-11),
-                                                               new Double(-27.5) },
+        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {Double.valueOf(3),
+                                                               Double.valueOf(2),
+                                                               Double.valueOf(-5.5),
+                                                               Double.valueOf(-11),
+                                                               Double.valueOf(-27.5) },
                 MathArrays.OrderDirection.DECREASING, true));
-        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {new Double(3),
-                                                                new Double(-1),
-                                                                new Double(0),
-                                                                new Double(-5.5),
-                                                                new Double(-11),
-                                                                new Double(-27.5) },
+        Assert.assertFalse(MathArrays.isMonotonic(new Double[] {Double.valueOf(3),
+                                                                Double.valueOf(-1),
+                                                                Double.valueOf(0),
+                                                                Double.valueOf(-5.5),
+                                                                Double.valueOf(-11),
+                                                                Double.valueOf(-27.5) },
                 MathArrays.OrderDirection.DECREASING, false));
-        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {new Double(3),
-                                                               new Double(0),
-                                                               new Double(0),
-                                                               new Double(-5.5),
-                                                               new Double(-11),
-                                                               new Double(-27.5) },
+        Assert.assertTrue(MathArrays.isMonotonic(new Double[] {Double.valueOf(3),
+                                                               Double.valueOf(0),
+                                                               Double.valueOf(0),
+                                                               Double.valueOf(-5.5),
+                                                               Double.valueOf(-11),
+                                                               Double.valueOf(-27.5) },
                 MathArrays.OrderDirection.DECREASING, false));
     }
 
diff --git a/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/PairTest.java b/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/PairTest.java
index b1327a3..8d21f3f 100644
--- a/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/PairTest.java
+++ b/commons-math-legacy-core/src/test/java/org/apache/commons/math4/legacy/core/PairTest.java
@@ -27,15 +27,15 @@
     @Test
     public void testAccessor() {
         final Pair<Integer, Double> p
-            = new Pair<>(new Integer(1), new Double(2));
-        Assert.assertEquals(new Integer(1), p.getKey());
+            = new Pair<>(Integer.valueOf(1), Double.valueOf(2));
+        Assert.assertEquals(Integer.valueOf(1), p.getKey());
         Assert.assertEquals(2, p.getValue().doubleValue(), Math.ulp(1d));
     }
 
     @Test
     public void testAccessor2() {
         final Pair<Integer, Double> p
-            = new Pair<>(new Integer(1), new Double(2));
+            = new Pair<>(Integer.valueOf(1), Double.valueOf(2));
 
         // Check that both APIs refer to the same data.
 
@@ -51,13 +51,13 @@
         Pair<Integer, Double> p2 = new Pair<>(null, null);
         Assert.assertEquals(p1, p2);
 
-        p1 = new Pair<>(new Integer(1), new Double(2));
+        p1 = new Pair<>(Integer.valueOf(1), Double.valueOf(2));
         Assert.assertNotEquals(p1, p2);
 
-        p2 = new Pair<>(new Integer(1), new Double(2));
+        p2 = new Pair<>(Integer.valueOf(1), Double.valueOf(2));
         Assert.assertEquals(p1, p2);
 
-        Pair<Integer, Float> p3 = new Pair<>(new Integer(1), new Float(2));
+        Pair<Integer, Float> p3 = new Pair<>(Integer.valueOf(1), Float.valueOf(2));
         Assert.assertNotEquals(p1, p3);
     }