Prevent string concatenations as argument to "StringBuffer.append()"

src/main/org/apache/tools/ant/Main.java

@@ -1287,7 +1287,7 @@ public class Main implements AntMain {
             spaces += spaces;
         }
         final StringBuilder msg = new StringBuilder();
-        msg.append(heading + lSep + lSep);
+        msg.append(heading).append(lSep).append(lSep);
         final int size = names.size();
         for (int i = 0; i < size; i++) {
             msg.append(" ");

src/main/org/apache/tools/ant/Project.java

@@ -1845,7 +1845,7 @@ public class Project implements ResourceFactory {
         for (int j = 0; j < root.length; j++) {
             buf.append((j == 0) ? " `" : ", `").append(root[j]).append('\'');
         }
-        buf.append(" is " + ret);
+        buf.append(" is ").append(ret);
         log(buf.toString(), MSG_VERBOSE);
 
         final Vector<Target> complete = (returnAll) ? ret : new Vector<Target>(ret);

src/main/org/apache/tools/ant/taskdefs/optional/depend/constantpool/ConstantPool.java

@@ -348,7 +348,7 @@ public class ConstantPool {
         final int size = entries.size();
 
         for (int i = 0; i < size; ++i) {
-            sb.append("[" + i + "] = " + getEntry(i) + "\n");
+            sb.append('[').append(i).append("] = ").append(getEntry(i)).append('\n');
         }
 
         return sb.toString();