diff --git a/src/main/java/com/fasterxml/jackson/core/Base64Variants.java b/src/main/java/com/fasterxml/jackson/core/Base64Variants.java
index 63f434afc9..4e65bdc1bb 100644
--- a/src/main/java/com/fasterxml/jackson/core/Base64Variants.java
+++ b/src/main/java/com/fasterxml/jackson/core/Base64Variants.java
@@ -64,7 +64,7 @@ public final class Base64Variants
      */
     public final static Base64Variant MODIFIED_FOR_URL;
     static {
-        StringBuffer sb = new StringBuffer(STD_BASE64_ALPHABET);
+        StringBuilder sb = new StringBuilder(STD_BASE64_ALPHABET);
         // Replace plus with hyphen, slash with underscore (and no padding)
         sb.setCharAt(sb.indexOf("+"), '-');
         sb.setCharAt(sb.indexOf("/"), '_');
diff --git a/src/main/java/com/fasterxml/jackson/core/JsonFactory.java b/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
index 68e06834f0..2e91c46d54 100644
--- a/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
+++ b/src/main/java/com/fasterxml/jackson/core/JsonFactory.java
@@ -249,7 +249,7 @@ public static int collectDefaults() {
      * and this reuse only works within context of a single
      * factory instance.
      */
-    public JsonFactory() { this((ObjectCodec) null); }
+    public JsonFactory() { this(null); }
 
     public JsonFactory(ObjectCodec oc) { _objectCodec = oc; }
 
diff --git a/src/main/java/com/fasterxml/jackson/core/JsonGenerationException.java b/src/main/java/com/fasterxml/jackson/core/JsonGenerationException.java
index 58a8b77f83..5a9d1818ce 100644
--- a/src/main/java/com/fasterxml/jackson/core/JsonGenerationException.java
+++ b/src/main/java/com/fasterxml/jackson/core/JsonGenerationException.java
@@ -27,6 +27,6 @@ public JsonGenerationException(String msg)
 
     public JsonGenerationException(String msg, Throwable rootCause)
     {
-        super(msg, (JsonLocation)null, rootCause);
+        super(msg, null, rootCause);
     }
 }
diff --git a/src/main/java/com/fasterxml/jackson/core/Version.java b/src/main/java/com/fasterxml/jackson/core/Version.java
index cc2603cf83..d5e550783e 100644
--- a/src/main/java/com/fasterxml/jackson/core/Version.java
+++ b/src/main/java/com/fasterxml/jackson/core/Version.java
@@ -76,13 +76,7 @@ public Version(int major, int minor, int patchLevel, String snapshotInfo,
     public String getArtifactId() { return _artifactId; }
     
     public String toFullString() {
-        return new StringBuilder()
-        	.append(_groupId)
-        	.append('/')
-        	.append(_artifactId)
-        	.append('/')
-        	.append(toString())
-        	.toString();
+        return _groupId + '/' + _artifactId + '/' + toString();
     }
     
     @Override
diff --git a/src/main/java/com/fasterxml/jackson/core/io/UTF32Reader.java b/src/main/java/com/fasterxml/jackson/core/io/UTF32Reader.java
index 1c54b3b42f..787b3ad880 100644
--- a/src/main/java/com/fasterxml/jackson/core/io/UTF32Reader.java
+++ b/src/main/java/com/fasterxml/jackson/core/io/UTF32Reader.java
@@ -201,9 +201,7 @@ private boolean loadMore(int available) throws IOException {
         // Bytes that need to be moved to the beginning of buffer?
         if (available > 0) {
             if (_ptr > 0) {
-                for (int i = 0; i < available; ++i) {
-                    _buffer[i] = _buffer[_ptr+i];
-                }
+                System.arraycopy(_buffer, _ptr, _buffer, 0, available);
                 _ptr = 0;
             }
             _length = available;
diff --git a/src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java b/src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java
index fba33c2680..05cf87fbc4 100644
--- a/src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java
+++ b/src/main/java/com/fasterxml/jackson/core/json/UTF8StreamJsonParser.java
@@ -2792,7 +2792,7 @@ protected char _decodeEscaped() throws IOException
         }
         int c = (int) _inputBuffer[_inputPtr++];
 
-        switch ((int) c) {
+        switch (c) {
             // First, ones that are mapped
         case 'b':
             return '\b';
@@ -2838,7 +2838,7 @@ protected char _decodeEscaped() throws IOException
 
     protected int _decodeCharForError(int firstByte) throws IOException
     {
-        int c = (int) firstByte;
+        int c = firstByte;
         if (c < 0) { // if >= 0, is ascii and fine as is
             int needed;
             
diff --git a/src/main/java/com/fasterxml/jackson/core/sym/BytesToNameCanonicalizer.java b/src/main/java/com/fasterxml/jackson/core/sym/BytesToNameCanonicalizer.java
index b7a498fa92..1f0cc3322e 100644
--- a/src/main/java/com/fasterxml/jackson/core/sym/BytesToNameCanonicalizer.java
+++ b/src/main/java/com/fasterxml/jackson/core/sym/BytesToNameCanonicalizer.java
@@ -1049,9 +1049,7 @@ private static Name constructName(int hash, String name, int[] quads, int qlen)
         }
         // Otherwise, need to copy the incoming buffer
         int[] buf = new int[qlen];
-        for (int i = 0; i < qlen; ++i) {
-            buf[i] = quads[i];
-        }
+        System.arraycopy(quads, 0, buf, 0, qlen);
         return new NameN(name, hash, buf, qlen);
     }
 
diff --git a/src/main/java/com/fasterxml/jackson/core/util/TextBuffer.java b/src/main/java/com/fasterxml/jackson/core/util/TextBuffer.java
index 9352b9382d..187754cd5d 100644
--- a/src/main/java/com/fasterxml/jackson/core/util/TextBuffer.java
+++ b/src/main/java/com/fasterxml/jackson/core/util/TextBuffer.java
@@ -700,7 +700,7 @@ private char[] resultArray()
         final char[] result = carr(size);
         if (_segments != null) {
             for (int i = 0, len = _segments.size(); i < len; ++i) {
-                char[] curr = (char[]) _segments.get(i);
+                char[] curr = _segments.get(i);
                 int currLen = curr.length;
                 System.arraycopy(curr, 0, result, offset, currLen);
                 offset += currLen;