You can use Double.parseDouble() to convert a String to a double: String text = “12.34”; // example String double value = Double.parseDouble(text); For your case it looks like you want: double total = Double.parseDouble(jlbTotal.getText()); double price = Double.parseDouble(jlbPrice.getText());
Just cast the enum, e.g. int something = (int) Question.Role; The above will work for the vast majority of enums you see in the wild, as the default underlying type for an enum is int. However, as cecilphillip points out, enums can have different underlying types. If an enum is declared as a uint, long, … Read more
Downcasting is allowed when there is a possibility that it succeeds at run time: Object o = getSomeObject(), String s = (String) o; // this is allowed because o could reference a String In some cases this will not succeed: Object o = new Object(); String s = (String) o; // this will fail at … Read more
The main reason is that classic C casts make no distinction between what we call static_cast<>(), reinterpret_cast<>(), const_cast<>(), and dynamic_cast<>(). These four things are completely different. A static_cast<>() is usually safe. There is a valid conversion in the language, or an appropriate constructor that makes it possible. The only time it’s a bit risky is … Read more
string s = (string)o; // 1 Throws InvalidCastException if o is not a string. Otherwise, assigns o to s, even if o is null. string s = o as string; // 2 Assigns null to s if o is not a string or if o is null. For this reason, you cannot use it with … Read more
How to convert an array to object in PHP?
In C++ operators (for POD types) always act on objects of the same type. Thus if they are not the same one will be promoted to match the other. The type of the result of the operation is the same as operands (after conversion). if: either is long double other is promoted > long double … Read more
How can I cast int to enum?
The compiler is right, an array of arrays (or a pointer to an array) is not the same as a pointer to a pointer. Just think about how they would be laid out in memory: A matrix of size MxN in the form of an array of arrays: +————–+————–+—–+—————-+————–+—–+——————+ | matrix[0][0] | matrix[0][1] | … … Read more
The answer below the line was written in 2008. C# 7 introduced pattern matching, which has largely replaced the as operator, as you can now write: if (randomObject is TargetType tt) { // Use tt here } Note that tt is still in scope after this, but not definitely assigned. (It is definitely assigned within … Read more