What is the “continue” keyword and how does it work in Java?

A continue statement without a label will re-execute from the condition the innermost while or do loop, and from the update expression of the innermost for loop. It is often used to early-terminate a loop’s processing and thereby avoid deeply-nested if statements. In the following example continue will get the next line, without processing the following statement in the loop. With a label, continue will re-execute from the loop … Read more

What does value & 0xff do in Java?

It sets result to the (unsigned) value resulting from putting the 8 bits of value in the lowest 8 bits of result. The reason something like this is necessary is that byte is a signed type in Java. If you just wrote: then result would end up with the value ff ff ff fe instead of 00 00 00 fe. A further subtlety is that the & is defined … Read more

Using getline() with file input in C++

getline, as it name states, read a whole line, or at least till a delimiter that can be specified. So the answer is “no”, getlinedoes not match your need. But you can do something like:

What is a wrapper class?

In general, a wrapper class is any class which “wraps” or “encapsulates” the functionality of another class or component. These are useful by providing a level of abstraction from the implementation of the underlying class or component; for example, wrapper classes that wrap COM components can manage the process of invoking the COM component without … Read more

What is a JavaBean exactly?

A JavaBean is just a standard All properties are private (use getters/setters) A public no-argument constructor Implements Serializable. That’s it. It’s just a convention. Lots of libraries depend on it though. With respect to Serializable, from the API documentation: Serializability of a class is enabled by the class implementing the java.io.Serializable interface. Classes that do not implement this interface will not … Read more

How to upgrade Git on Windows to the latest version

Since Git 2.16.1(2) you can use In version between 2.14.2 and 2.16.1, the command was (It was later renamed to avoid confusion with updating the local repository, e.g. like svn update does it.) That command does not exist in Git 2.13 and before. If this errors with “is not a git command” then either you don’t actually … Read more

What is float in Java?

In Java, when you type a decimal number as 3.6, its interpreted as a double. double is a 64-bit precision IEEE 754 floating point, while floatis a 32-bit precision IEEE 754 floating point. As a float is less precise than a double, the conversion cannot be performed implicitly. If you want to create a float, you should end your number with f (i.e.: 3.6f).

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