As explained in short C# (but also for other language compilers as well, like Java) There is a predefined implicit conversion from short to int, long, float, double, or decimal. You cannot implicitly convert nonliteral numeric types of larger storage size to short (see Integral Types Table for the storage sizes of integral types). Consider, … Read more
From book OCA JAVA SE 7 Just as men and women are fundamentally different (according to John Gray, author of Men Are from Mars, Women Are from Venus), primitive variables and object reference variables differ from each other in multiple ways. The basic difference is that primitive variables store the actual values, whereas reference variables … Read more
Basic Predicates/F-functions McCarthy’s Elementary S-functions and Predicates were: atom Which was necessary because car and cdr are defined for lists only, which means you cannot count on any sort of answer to indicate what was happening if you gave car an atom. eq For testing equality between atoms. car For returning the first half (address) … Read more
Just wrap your primitives in a simple container and pass that as a parameter to AsyncTask, like this: private static class MyTaskParams { int foo; long bar; double arple; MyTaskParams(int foo, long bar, double arple) { this.foo = foo; this.bar = bar; this.arple = arple; } } private class MyTask extends AsyncTask<MyTaskParams, Void, Void> { … Read more
If the object is actually a Boolean instance, then just cast it: boolean di = (Boolean) someObject; The explicit cast will do the conversion to Boolean, and then there’s the auto-unboxing to the primitive value. Or you can do that explicitly: boolean di = ((Boolean) someObject).booleanValue(); If someObject doesn’t refer to a Boolean value though, … Read more
The result of adding Java chars, shorts, or bytes is an int: Java Language Specification on Binary Numeric Promotion: If any of the operands is of a reference type, unboxing conversion (ยง5.1.8) is performed. Then: If either operand is of type double, the other is converted to double. Otherwise, if either operand is of type … Read more
Starting Java 8, there is support for unsigned long (unsigned 64 bits). The way you can use it is: Long l1 = Long.parseUnsignedLong(“17916881237904312345”); To print it, you can not simply print l1, but you have to first: String l1Str = Long.toUnsignedString(l1) Then System.out.println(l1Str);
In Joshua Bloch’s Effective Java, Item 5: “Avoid creating unnecessary objects”, he posts the following code example: public static void main(String[] args) { Long sum = 0L; // uses Long, not long for (long i = 0; i <= Integer.MAX_VALUE; i++) { sum += i; } System.out.println(sum); } and it takes 43 seconds to run. … Read more
The JVM is caching Integer values. Hence the comparison with == only works for numbers between -128 and 127. Refer: #Immutable_Objects_.2F_Wrapper_Class_Caching
I am not sure whether I understood your intentions correctly, but let’s see if this one helps. public class TypedProperty<T> : Property where T : IConvertible { public T TypedValue { get { return (T)Convert.ChangeType(base.Value, typeof(T)); } set { base.Value = value.ToString();} } }