update Java version

Author: peteroupc

src/main/java/com/upokecenter/cbor/CBORInteger.java

@@ -56,7 +56,7 @@ public boolean CanFitInSingle(Object obj) {
       if (intItem == Long.MIN_VALUE) {
         return true;
       }
-      intItem = Math.abs(intItem);
+      intItem = (intItem< 0) ? -intItem : intItem;
       while (intItem >= (1L << 24) && (intItem & 1) == 0) {
         intItem >>= 1;
       }
@@ -68,7 +68,7 @@ public boolean CanFitInDouble(Object obj) {
       if (intItem == Long.MIN_VALUE) {
         return true;
       }
-      intItem = Math.abs(intItem);
+      intItem = (intItem < 0) ? -intItem : intItem;
       while (intItem >= (1L << 53) && (intItem & 1) == 0) {
         intItem >>= 1;
       }

src/main/java/com/upokecenter/cbor/CBORJson.java

@@ -442,7 +442,7 @@ static void WriteJSONToInternal(
             }
             writer.WriteString(
               CBORObject.TrimDotZero(
-                Float.toString((float)f)));
+                CBORUtilities.SingleToString(f)));
             return;
           }
           case CBORObject.CBORObjectTypeDouble: {

src/main/java/com/upokecenter/cbor/CBORTag2.java

@@ -46,7 +46,7 @@ static CBORObject ConvertToBigNum(CBORObject o, boolean negative) {
         }
         if (negative) {
           x = -x;
-          x -= 1L;
+          --x;
         }
         return FromObjectAndInnerTags(x, o);
       }

src/main/java/com/upokecenter/cbor/CBORTag32.java

@@ -31,6 +31,7 @@ public CBORObject ToCBORObject(java.net.URI uri) {
       if (uri == null) {
         throw new NullPointerException("uri");
       }
-      return CBORObject.FromObjectAndTag(uri.toString(), (int)32);
+      String uriString = uri.toString();
+      return CBORObject.FromObjectAndTag(uriString, (int)32);
     }
   }

src/main/java/com/upokecenter/cbor/URIUtility.java

@@ -506,8 +506,9 @@ private static String normalizePath(String path) {
           // is "/.."; remove last segment,
           // append "/" and return
           int index2 = builder.length() - 1;
+          String builderString = builder.toString();
           while (index2 >= 0) {
-            if (builder.charAt(index2) == '/') {
+            if (builderString.charAt(index2) == '/') {
               break;
             }
             --index2;
@@ -523,8 +524,9 @@ private static String normalizePath(String path) {
             path.charAt(index + 2) == '.' && path.charAt(index + 3) == '/') {
           // begins with "/../"; remove last segment
           int index2 = builder.length() - 1;
+          String builderString = builder.toString();
           while (index2 >= 0) {
-            if (builder.charAt(index2) == '/') {
+            if (builderString.charAt(index2) == '/') {
               break;
             }
             --index2;