diff --git a/src/main/org/apache/tools/ant/taskdefs/BUnzip2.java b/src/main/org/apache/tools/ant/taskdefs/BUnzip2.java
index 253e6898e..2f13626b9 100644
--- a/src/main/org/apache/tools/ant/taskdefs/BUnzip2.java
+++ b/src/main/org/apache/tools/ant/taskdefs/BUnzip2.java
@@ -39,6 +39,8 @@ import org.apache.tools.bzip2.CBZip2InputStream;
 
 public class BUnzip2 extends Unpack {
 
+    private static final int BUFFER_SIZE = 8 * 1024;
+
     private static final String DEFAULT_EXTENSION = ".bz2";
 
     /**
@@ -74,7 +76,7 @@ public class BUnzip2 extends Unpack {
                     throw new BuildException("Invalid bz2 file.", getLocation());
                 }
                 zIn = new CBZip2InputStream(bis);
-                byte[] buffer = new byte[8 * 1024];
+                byte[] buffer = new byte[BUFFER_SIZE];
                 int count = 0;
                 do {
                     out.write(buffer, 0, count);
diff --git a/src/main/org/apache/tools/ant/taskdefs/Checksum.java b/src/main/org/apache/tools/ant/taskdefs/Checksum.java
index 0b602d1f9..2d5c8820a 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Checksum.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Checksum.java
@@ -58,6 +58,12 @@ import org.apache.tools.ant.util.StringUtils;
  * @ant.task category="control"
  */
 public class Checksum extends MatchingTask implements Condition {
+
+    private static final int NIBBLE = 4;
+    private static final int WORD = 16;
+    private static final int BUFFER_SIZE = 8 * 1024;
+    private static final int BYTE_MASK = 0xFF;
+
     private static class FileUnion extends Restrict {
         private Union u;
         FileUnion() {
@@ -144,7 +150,7 @@ public class Checksum extends MatchingTask implements Condition {
     /**
      * Size of the read buffer to use.
      */
-    private int readBufferSize = 8 * 1024;
+    private int readBufferSize = BUFFER_SIZE;
 
     /**
      * Formater for the checksum file.
@@ -572,7 +578,7 @@ public class Checksum extends MatchingTask implements Condition {
     private String createDigestString(byte[] fileDigest) {
         StringBuffer checksumSb = new StringBuffer();
         for (int i = 0; i < fileDigest.length; i++) {
-            String hexStr = Integer.toHexString(0x00ff & fileDigest[i]);
+            String hexStr = Integer.toHexString(BYTE_MASK & fileDigest[i]);
             if (hexStr.length() < 2) {
                 checksumSb.append("0");
             }
@@ -604,9 +610,9 @@ public class Checksum extends MatchingTask implements Condition {
 
         // two characters form the hex value.
         for (int i = 0, j = 0; j < l; i++) {
-            int f = Character.digit(data[j++], 16) << 4;
-            f = f | Character.digit(data[j++], 16);
-            out[i] = (byte) (f & 0xFF);
+            int f = Character.digit(data[j++], WORD) << NIBBLE;
+            f = f | Character.digit(data[j++], WORD);
+            out[i] = (byte) (f & BYTE_MASK);
         }
 
         return out;
diff --git a/src/main/org/apache/tools/ant/taskdefs/ExecTask.java b/src/main/org/apache/tools/ant/taskdefs/ExecTask.java
index 8f150ede7..dcddb5e49 100644
--- a/src/main/org/apache/tools/ant/taskdefs/ExecTask.java
+++ b/src/main/org/apache/tools/ant/taskdefs/ExecTask.java
@@ -43,13 +43,13 @@ import org.apache.tools.ant.util.FileUtils;
  */
 public class ExecTask extends Task {
 
-    // CheckStyle:VisibilityModifier OFF - bc
     private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
 
     private String os;
     private String osFamily;
 
     private File dir;
+    // CheckStyle:VisibilityModifier OFF - bc
     protected boolean failOnError = false;
     protected boolean newEnvironment = false;
     private Long timeout = null;
@@ -433,7 +433,7 @@ public class ExecTask extends Task {
             if (environment != null) {
                 for (int i = 0; i < environment.length; i++) {
                     if (isPath(environment[i])) {
-                        p = new Path(getProject(), environment[i].substring(5));
+                        p = new Path(getProject(), getPath(environment[i]));
                         break;
                     }
                 }
@@ -444,7 +444,7 @@ public class ExecTask extends Task {
                 while (e.hasMoreElements()) {
                     String line = (String) e.nextElement();
                     if (isPath(line)) {
-                        p = new Path(getProject(), line.substring(5));
+                        p = new Path(getProject(), getPath(line));
                         break;
                     }
                 }
@@ -703,7 +703,11 @@ public class ExecTask extends Task {
     }
 
     private boolean isPath(String line) {
-        return line.startsWith("PATH=") || line.startsWith("Path=");
+        return line.startsWith("PATH=")
+            || line.startsWith("Path=");
     }
 
+    private String getPath(String line) {
+        return line.substring("PATH=".length());
+    }
 }
diff --git a/src/main/org/apache/tools/ant/taskdefs/Execute.java b/src/main/org/apache/tools/ant/taskdefs/Execute.java
index ca7a3b6b3..aadf43fff 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Execute.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Execute.java
@@ -49,6 +49,8 @@ import org.apache.tools.ant.util.StringUtils;
  */
 public class Execute {
 
+    private static final int ONE_SECOND = 1000;
+
     /** Invalid exit code.
      * set to {@link Integer#MAX_VALUE}
      */
@@ -518,7 +520,7 @@ public class Execute {
                                        useVMLauncher);
         if (Os.isFamily("windows")) {
             try {
-                Thread.sleep(1000);
+                Thread.sleep(ONE_SECOND);
             } catch (InterruptedException e) {
                 project.log("interruption in the sleep after having spawned a"
                             + " process", Project.MSG_VERBOSE);
@@ -911,6 +913,7 @@ public class Execute {
             final int preCmdLength = 7;
             final String cmdDir = commandDir.getAbsolutePath();
             String[] newcmd = new String[cmd.length + preCmdLength];
+            // CheckStyle:MagicNumber OFF - do not bother
             newcmd[0] = "cmd";
             newcmd[1] = "/c";
             newcmd[2] = cmdDir.substring(0, 2);
@@ -918,6 +921,7 @@ public class Execute {
             newcmd[4] = "cd";
             newcmd[5] = cmdDir.substring(2);
             newcmd[6] = "&&";
+            // CheckStyle:MagicNumber ON
             System.arraycopy(cmd, 0, newcmd, preCmdLength, cmd.length);
 
             return exec(project, newcmd, env);
@@ -959,12 +963,14 @@ public class Execute {
             // the command
             final int preCmdLength = 6;
             String[] newcmd = new String[cmd.length + preCmdLength];
+            // CheckStyle:MagicNumber OFF - do not bother
             newcmd[0] = "cmd";
             newcmd[1] = "/c";
             newcmd[2] = "cd";
             newcmd[3] = "/d";
             newcmd[4] = commandDir.getAbsolutePath();
             newcmd[5] = "&&";
+            // CheckStyle:MagicNumber ON
             System.arraycopy(cmd, 0, newcmd, preCmdLength, cmd.length);
 
             return exec(project, newcmd, env);
diff --git a/src/main/org/apache/tools/ant/taskdefs/Expand.java b/src/main/org/apache/tools/ant/taskdefs/Expand.java
index a58a044f4..269b1b73f 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Expand.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Expand.java
@@ -58,6 +58,7 @@ import org.apache.tools.zip.ZipFile;
  *           name="unwar"
  */
 public class Expand extends Task {
+    private static final int BUFFER_SIZE = 1024;
     private File dest; //req
     private File source; // req
     private boolean overwrite = true;
@@ -275,7 +276,7 @@ public class Expand extends Task {
             if (isDirectory) {
                 f.mkdirs();
             } else {
-                byte[] buffer = new byte[1024];
+                byte[] buffer = new byte[BUFFER_SIZE];
                 int length = 0;
                 FileOutputStream fos = null;
                 try {
diff --git a/src/main/org/apache/tools/ant/taskdefs/GUnzip.java b/src/main/org/apache/tools/ant/taskdefs/GUnzip.java
index 00ff123b2..30e70cce6 100644
--- a/src/main/org/apache/tools/ant/taskdefs/GUnzip.java
+++ b/src/main/org/apache/tools/ant/taskdefs/GUnzip.java
@@ -36,7 +36,7 @@ import org.apache.tools.ant.util.FileUtils;
  */
 
 public class GUnzip extends Unpack {
-
+    private static final int BUFFER_SIZE = 8 * 1024;
     private static final String DEFAULT_EXTENSION = ".gz";
 
     /**
@@ -62,7 +62,7 @@ public class GUnzip extends Unpack {
                 out = new FileOutputStream(dest);
                 fis = srcResource.getInputStream();
                 zIn = new GZIPInputStream(fis);
-                byte[] buffer = new byte[8 * 1024];
+                byte[] buffer = new byte[BUFFER_SIZE];
                 int count = 0;
                 do {
                     out.write(buffer, 0, count);
diff --git a/src/main/org/apache/tools/ant/taskdefs/Get.java b/src/main/org/apache/tools/ant/taskdefs/Get.java
index d3e522adc..1d1330760 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Get.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Get.java
@@ -44,7 +44,7 @@ import java.util.Date;
  * @ant.task category="network"
  */
 public class Get extends Task {
-
+    private static final int BIG_BUFFER_SIZE = 100 * 1024;
     private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
 
     private URL source; // required
@@ -202,7 +202,7 @@ public class Get extends Task {
         progress.beginDownload();
         boolean finished = false;
         try {
-            byte[] buffer = new byte[100 * 1024];
+            byte[] buffer = new byte[BIG_BUFFER_SIZE];
             int length;
             while ((length = is.read(buffer)) >= 0) {
                 fos.write(buffer, 0, length);
diff --git a/src/main/org/apache/tools/ant/taskdefs/Pack.java b/src/main/org/apache/tools/ant/taskdefs/Pack.java
index 09c4bc398..7735666c5 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Pack.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Pack.java
@@ -35,7 +35,7 @@ import org.apache.tools.ant.types.resources.FileResource;
  */
 
 public abstract class Pack extends Task {
-
+    private static final int BUFFER_SIZE = 8 * 1024;
     // CheckStyle:VisibilityModifier OFF - bc
     protected File zipFile;
     protected File source;
@@ -148,7 +148,7 @@ public abstract class Pack extends Task {
      */
     private void zipFile(InputStream in, OutputStream zOut)
         throws IOException {
-        byte[] buffer = new byte[8 * 1024];
+        byte[] buffer = new byte[BUFFER_SIZE];
         int count = 0;
         do {
             zOut.write(buffer, 0, count);