diff --git a/java/com/google/flatbuffers/Constants.java b/java/com/google/flatbuffers/Constants.java
index ac0593ae6..c3b98c5e8 100644
--- a/java/com/google/flatbuffers/Constants.java
+++ b/java/com/google/flatbuffers/Constants.java
@@ -23,10 +23,18 @@ package com.google.flatbuffers;
  */
 public class Constants {
     // Java doesn't seem to have these.
+    /** The number of bytes in an `byte`. */
+    static final int SIZEOF_BYTE = 1;
     /** The number of bytes in a `short`. */
     static final int SIZEOF_SHORT = 2;
     /** The number of bytes in an `int`. */
     static final int SIZEOF_INT = 4;
+    /** The number of bytes in an `float`. */
+    static final int SIZEOF_FLOAT = 4;
+    /** The number of bytes in an `long`. */
+    static final int SIZEOF_LONG = 8;
+    /** The number of bytes in an `double`. */
+    static final int SIZEOF_DOUBLE = 4;
     /** The number of bytes in a file identifier. */
     static final int FILE_IDENTIFIER_LENGTH = 4;
 }
diff --git a/java/com/google/flatbuffers/FlatBufferBuilder.java b/java/com/google/flatbuffers/FlatBufferBuilder.java
index fecb213f6..c2186fa7b 100644
--- a/java/com/google/flatbuffers/FlatBufferBuilder.java
+++ b/java/com/google/flatbuffers/FlatBufferBuilder.java
@@ -188,7 +188,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `boolean` to put into the buffer.
      */
-    public void putBoolean(boolean x) { bb.put      (space -= 1, (byte)(x ? 1 : 0)); }
+    public void putBoolean(boolean x) { bb.put      (space -= Constants.SIZEOF_BYTE, (byte)(x ? 1 : 0)); }
 
     /**
      * Add a `byte` to the buffer, backwards from the current location. Doesn't align nor
@@ -196,7 +196,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `byte` to put into the buffer.
      */
-    public void putByte   (byte    x) { bb.put      (space -= 1, x); }
+    public void putByte   (byte    x) { bb.put      (space -= Constants.SIZEOF_BYTE, x); }
 
     /**
      * Add a `short` to the buffer, backwards from the current location. Doesn't align nor
@@ -204,7 +204,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `short` to put into the buffer.
      */
-    public void putShort  (short   x) { bb.putShort (space -= 2, x); }
+    public void putShort  (short   x) { bb.putShort (space -= Constants.SIZEOF_SHORT, x); }
 
     /**
      * Add an `int` to the buffer, backwards from the current location. Doesn't align nor
@@ -212,7 +212,7 @@ public class FlatBufferBuilder {
      *
      * @param x An `int` to put into the buffer.
      */
-    public void putInt    (int     x) { bb.putInt   (space -= 4, x); }
+    public void putInt    (int     x) { bb.putInt   (space -= Constants.SIZEOF_INT, x); }
 
     /**
      * Add a `long` to the buffer, backwards from the current location. Doesn't align nor
@@ -220,7 +220,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `long` to put into the buffer.
      */
-    public void putLong   (long    x) { bb.putLong  (space -= 8, x); }
+    public void putLong   (long    x) { bb.putLong  (space -= Constants.SIZEOF_LONG, x); }
 
     /**
      * Add a `float` to the buffer, backwards from the current location. Doesn't align nor
@@ -228,7 +228,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `float` to put into the buffer.
      */
-    public void putFloat  (float   x) { bb.putFloat (space -= 4, x); }
+    public void putFloat  (float   x) { bb.putFloat (space -= Constants.SIZEOF_FLOAT, x); }
 
     /**
      * Add a `double` to the buffer, backwards from the current location. Doesn't align nor
@@ -236,7 +236,7 @@ public class FlatBufferBuilder {
      *
      * @param x A `double` to put into the buffer.
      */
-    public void putDouble (double  x) { bb.putDouble(space -= 8, x); }
+    public void putDouble (double  x) { bb.putDouble(space -= Constants.SIZEOF_DOUBLE, x); }
     /// @endcond
 
     /**
@@ -244,49 +244,49 @@ public class FlatBufferBuilder {
      *
      * @param x A `boolean` to put into the buffer.
      */
-    public void addBoolean(boolean x) { prep(1, 0); putBoolean(x); }
+    public void addBoolean(boolean x) { prep(Constants.SIZEOF_BYTE, 0); putBoolean(x); }
 
     /**
      * Add a `byte` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x A `byte` to put into the buffer.
      */
-    public void addByte   (byte    x) { prep(1, 0); putByte   (x); }
+    public void addByte   (byte    x) { prep(Constants.SIZEOF_BYTE, 0); putByte   (x); }
 
     /**
      * Add a `short` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x A `short` to put into the buffer.
      */
-    public void addShort  (short   x) { prep(2, 0); putShort  (x); }
+    public void addShort  (short   x) { prep(Constants.SIZEOF_SHORT, 0); putShort  (x); }
 
     /**
      * Add an `int` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x An `int` to put into the buffer.
      */
-    public void addInt    (int     x) { prep(4, 0); putInt    (x); }
+    public void addInt    (int     x) { prep(Constants.SIZEOF_INT, 0); putInt    (x); }
 
     /**
      * Add a `long` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x A `long` to put into the buffer.
      */
-    public void addLong   (long    x) { prep(8, 0); putLong   (x); }
+    public void addLong   (long    x) { prep(Constants.SIZEOF_LONG, 0); putLong   (x); }
 
     /**
      * Add a `float` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x A `float` to put into the buffer.
      */
-    public void addFloat  (float   x) { prep(4, 0); putFloat  (x); }
+    public void addFloat  (float   x) { prep(Constants.SIZEOF_FLOAT, 0); putFloat  (x); }
 
     /**
      * Add a `double` to the buffer, properly aligned, and grows the buffer (if necessary).
      *
      * @param x A `double` to put into the buffer.
      */
-    public void addDouble (double  x) { prep(8, 0); putDouble (x); }
+    public void addDouble (double  x) { prep(Constants.SIZEOF_DOUBLE, 0); putDouble (x); }
 
    /**
     * Adds on offset, relative to where it will be written.