fix: address some deprecation warnings in Java 9+ (#1215)

Author: elharo

google-http-client-xml/src/main/java/com/google/api/client/xml/Xml.java

@@ -575,10 +575,10 @@ private static Object parseValue(Type valueType, List<Type> context, String valu
     valueType = Data.resolveWildcardTypeOrTypeVariable(context, valueType);
     if (valueType == Double.class || valueType == double.class) {
       if (value.equals("INF")) {
-        return new Double(Double.POSITIVE_INFINITY);
+        return Double.valueOf(Double.POSITIVE_INFINITY);
       }
       if (value.equals("-INF")) {
-        return new Double(Double.NEGATIVE_INFINITY);
+        return Double.valueOf(Double.NEGATIVE_INFINITY);
       }
     }
     if (valueType == Float.class || valueType == float.class) {

google-http-client/src/main/java/com/google/api/client/util/Data.java

@@ -45,36 +45,47 @@ public class Data {
   // NOTE: create new instances to avoid cache, e.g. new String()
 
   /** The single instance of the magic null object for a {@link Boolean}. */
+  @SuppressWarnings("deprecation")
   public static final Boolean NULL_BOOLEAN = new Boolean(true);
 
   /** The single instance of the magic null object for a {@link String}. */
+  @SuppressWarnings("deprecation")
   public static final String NULL_STRING = new String();
 
   /** The single instance of the magic null object for a {@link Character}. */
+  @SuppressWarnings("deprecation")
   public static final Character NULL_CHARACTER = new Character((char) 0);
 
   /** The single instance of the magic null object for a {@link Byte}. */
+  @SuppressWarnings("deprecation")
   public static final Byte NULL_BYTE = new Byte((byte) 0);
 
   /** The single instance of the magic null object for a {@link Short}. */
+  @SuppressWarnings("deprecation")
   public static final Short NULL_SHORT = new Short((short) 0);
 
   /** The single instance of the magic null object for a {@link Integer}. */
+  @SuppressWarnings("deprecation")
   public static final Integer NULL_INTEGER = new Integer(0);
 
   /** The single instance of the magic null object for a {@link Float}. */
+  @SuppressWarnings("deprecation")
   public static final Float NULL_FLOAT = new Float(0);
 
   /** The single instance of the magic null object for a {@link Long}. */
+  @SuppressWarnings("deprecation")
   public static final Long NULL_LONG = new Long(0);
 
   /** The single instance of the magic null object for a {@link Double}. */
+  @SuppressWarnings("deprecation")
   public static final Double NULL_DOUBLE = new Double(0);
 
   /** The single instance of the magic null object for a {@link BigInteger}. */
+  @SuppressWarnings("deprecation")
   public static final BigInteger NULL_BIG_INTEGER = new BigInteger("0");
 
   /** The single instance of the magic null object for a {@link BigDecimal}. */
+  @SuppressWarnings("deprecation")
   public static final BigDecimal NULL_BIG_DECIMAL = new BigDecimal("0");
 
   /** The single instance of the magic null object for a {@link DateTime}. */

google-http-client/src/test/java/com/google/api/client/util/ObjectsTest.java

@@ -34,7 +34,7 @@ public void testConstructor_innerClass() {
 
   public void testToString_oneIntegerField() {
     String toTest =
-        Objects.toStringHelper(new TestClass()).add("field1", new Integer(42)).toString();
+        Objects.toStringHelper(new TestClass()).add("field1", Integer.valueOf(42)).toString();
     assertEquals("TestClass{field1=42}", toTest);
   }