minor simplification of null checks

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/JsonGenerator.java

@@ -7,6 +7,7 @@
 import java.io.*;
 import java.math.BigDecimal;
 import java.math.BigInteger;
+import java.util.Objects;
 
 import com.fasterxml.jackson.core.JsonParser.NumberType;
 import com.fasterxml.jackson.core.io.CharacterEscapes;
@@ -514,9 +515,7 @@ public void setSchema(FormatSchema schema) {
      */
     public void writeArray(int[] array, int offset, int length) throws IOException
     {
-        if (array == null) {
-            throw new IllegalArgumentException("null array");
-        }
+        Objects.requireNonNull(array, "null 'array' argument");
         _verifyOffsets(array.length, offset, length);
         writeStartArray(array, length);
         for (int i = offset, end = offset+length; i < end; ++i) {
@@ -536,9 +535,7 @@ public void writeArray(int[] array, int offset, int length) throws IOException
      */
     public void writeArray(long[] array, int offset, int length) throws IOException
     {
-        if (array == null) {
-            throw new IllegalArgumentException("null array");
-        }
+        Objects.requireNonNull(array, "null 'array' argument");
         _verifyOffsets(array.length, offset, length);
         writeStartArray(array, length);
         for (int i = offset, end = offset+length; i < end; ++i) {
@@ -558,9 +555,7 @@ public void writeArray(long[] array, int offset, int length) throws IOException
      */
     public void writeArray(double[] array, int offset, int length) throws IOException
     {
-        if (array == null) {
-            throw new IllegalArgumentException("null array");
-        }
+        Objects.requireNonNull(array, "null 'array' argument");
         _verifyOffsets(array.length, offset, length);
         writeStartArray(array, length);
         for (int i = offset, end = offset+length; i < end; ++i) {
@@ -574,17 +569,13 @@ public void writeArray(double[] array, int offset, int length) throws IOExceptio
      * array (sequence of {@link JsonToken#START_ARRAY}, zero or
      * more {@link JsonToken#VALUE_STRING}, {@link JsonToken#END_ARRAY})
      *
-     * @since 2.11
-     *
      * @param array Array that contains values to write
      * @param offset Offset of the first element to write, within array
      * @param length Number of elements in array to write, from `offset` to `offset + len - 1`
      */
     public void writeArray(String[] array, int offset, int length) throws IOException
     {
-        if (array == null) {
-            throw new IllegalArgumentException("null array");
-        }
+        Objects.requireNonNull(array, "null 'array' argument");
         _verifyOffsets(array.length, offset, length);
         writeStartArray(array, length);
         for (int i = offset, end = offset+length; i < end; ++i) {