Merge pull request #2 from adambard/master

Update my fork to upstream

1 files changed, 16 insertions, 9 deletions

diff --git a/java.html.markdown b/java.html.markdown
index 1813f81c..84978ecc 100644
--- a/java.html.markdown
+++ b/java.html.markdown
@@ -128,7 +128,7 @@ public class LearnJava {
         //
         // BigInteger can be initialized using an array of bytes or a string.
         
-        BigInteger fooBigInteger = new BigDecimal(fooByteArray);
+        BigInteger fooBigInteger = new BigInteger(fooByteArray);
 
 
         // BigDecimal - Immutable, arbitrary-precision signed decimal number
@@ -144,7 +144,12 @@ public class LearnJava {
         // or by initializing the unscaled value (BigInteger) and scale (int).
 
         BigDecimal fooBigDecimal = new BigDecimal(fooBigInteger, fooInt);
-
+        
+        // Be wary of the constructor that takes a float or double as
+        // the inaccuracy of the float/double will be copied in BigDecimal.
+        // Prefer the String constructor when you need an exact value.
+        
+        BigDecimal tenCents = new BigDecimal("0.1");
 
 
         // Strings
@@ -207,8 +212,8 @@ public class LearnJava {
         System.out.println("1+2 = " + (i1 + i2)); // => 3
         System.out.println("2-1 = " + (i2 - i1)); // => 1
         System.out.println("2*1 = " + (i2 * i1)); // => 2
-        System.out.println("1/2 = " + (i1 / i2)); // => 0 (0.5 truncated down)
-        System.out.println("1/2 = " + (i1 / (i2*1.0))); // => 0.5
+        System.out.println("1/2 = " + (i1 / i2)); // => 0 (int/int returns an int)
+        System.out.println("1/2 = " + (i1 / (double)i2)); // => 0.5
 
         // Modulo
         System.out.println("11%3 = "+(11 % 3)); // => 2
@@ -416,7 +421,7 @@ public class LearnJava {
         // easier way, by using something that is called Double Brace
         // Initialization.
 
-        private static final Set<String> COUNTRIES = HashSet<String>() {{
+        private static final Set<String> COUNTRIES = new HashSet<String>() {{
             add("DENMARK");
             add("SWEDEN");
             add("FINLAND");
@@ -701,10 +706,12 @@ public abstract class Mammal()
 
 // Enum Type
 //
-// An enum type is a special data type that enables for a variable to be a set of predefined constants. The        // variable must be equal to one of the values that have been predefined for it.
-// Because they are constants, the names of an enum type's fields are in uppercase letters.
-// In the Java programming language, you define an enum type by using the enum keyword. For example, you would 
-// specify a days-of-the-week enum type as:
+// An enum type is a special data type that enables for a variable to be a set
+// of predefined constants. The variable must be equal to one of the values that
+// have been predefined for it. Because they are constants, the names of an enum
+// type's fields are in uppercase letters. In the Java programming language, you
+// define an enum type by using the enum keyword. For example, you would specify
+// a days-of-the-week enum type as:
 
 public enum Day {
     SUNDAY, MONDAY, TUESDAY, WEDNESDAY,