diff --git a/src/share/classes/java/lang/Class.java b/src/share/classes/java/lang/Class.java
--- a/src/share/classes/java/lang/Class.java
+++ b/src/share/classes/java/lang/Class.java
@@ -152,8 +152,8 @@
      * @return a string representation of this class object.
      */
     public String toString() {
-        return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
-            + getName();
+        String className = getName();
+        return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) + className;
     }
 
     /**
diff --git a/src/share/classes/java/lang/Object.java b/src/share/classes/java/lang/Object.java
--- a/src/share/classes/java/lang/Object.java
+++ b/src/share/classes/java/lang/Object.java
@@ -233,7 +233,8 @@
      * @return  a string representation of the object.
      */
     public String toString() {
-        return getClass().getName() + "@" + Integer.toHexString(hashCode());
+        String className = getClass().getName();
+        return className + '@' + Integer.toHexString(hashCode());
     }
 
     /**
diff --git a/src/share/classes/java/lang/invoke/MethodHandleProxies.java b/src/share/classes/java/lang/invoke/MethodHandleProxies.java
--- a/src/share/classes/java/lang/invoke/MethodHandleProxies.java
+++ b/src/share/classes/java/lang/invoke/MethodHandleProxies.java
@@ -302,7 +302,8 @@
         assert(isObjectMethod(m)) : m;
         switch (m.getName()) {
         case "toString":
-            return self.getClass().getName() + "@" + Integer.toHexString(self.hashCode());
+            String className = self.getClass().getName();
+            return className + '@' + Integer.toHexString(self.hashCode());
         case "hashCode":
             return System.identityHashCode(self);
         case "equals":
diff --git a/src/share/classes/java/net/URLConnection.java b/src/share/classes/java/net/URLConnection.java
--- a/src/share/classes/java/net/URLConnection.java
+++ b/src/share/classes/java/net/URLConnection.java
@@ -849,7 +849,8 @@
      * @return  a string representation of this {@code URLConnection}.
      */
     public String toString() {
-        return this.getClass().getName() + ":" + url;
+        String className = this.getClass().getName();
+        return className + ':' + url;
     }
 
     /**