What is the Java API?

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The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets.

2013-02-20, 2272👍, 0💬

What is native code?
What is native code? The native code is code that after you compile it, the compiled code runs on a specific hardware platform. 2013-02-21, 2427👍, 0💬

Is Java code slower than native code?
Is Java code slower than native code? Not really. As a platform-independent environment, the Java platform can be a bit slower than native code. However, smart compilers, well-tuned interpreters, and just-in-time bytecode compilers can bring performance close to that of native code without threateni... 2013-02-22, 2412👍, 0💬

Can main() method be overloaded?
Can main() method be overloaded? Yes. the main() method is a special method for a program entry. You can overload main() method in any ways. But if you change the signature of the main method, the entry point for the program will be gone. 2013-02-25, 2383👍, 0💬

What does it mean that a method or class is abstract?
What does it mean that a method or class is abstract? An abstract class cannot be instantiated. Only its subclasses can be instantiated. You indicate that a class is abstract with the abstract keyword like this: public abstract class Container extends Component { Abstract classes may contain abstrac... 2013-02-19, 2362👍, 0💬

What does it mean that a class or member is final?
What does it mean that a class or member is final? A final class can no longer be subclassed. Mostly this is done for security reasons with basic classes like String and Integer. It also allows the compiler to make some optimizations, and makes thread safety a little easier to achieve. Methods may b... 2013-02-18, 2312👍, 0💬

What is the Java Virtual Machine?
What is the Java Virtual Machine? The Java Virtual Machine is a software that can be ported onto various hardware-based platforms. 2013-02-20, 2309👍, 0💬

What is the main difference between Java platform and other platforms?
What is the main difference between Java platform and other platforms? The Java platform differs from most other platforms in that it's a software-only platform that runs on top of other hardware-based platforms. The Java platform has three elements: Java programming language The Java Virtual Machin... 2013-02-19, 2303👍, 0💬

Why are there no global variables in Java?
Why are there no global variables in Java? Global variables are considered bad form for a variety of reasons: Â· Adding state variables breaks referential transparency (you no longer can understand a statement or expression on its own: you need to understand it in the context of the settings of the ... 2013-02-18, 2297👍, 0💬

Explain the user defined Exceptions?
Explain the user defined Exceptions? User defined Exceptions are the separate Exception classes defined by the user for specific purposed. An user defined can created by simply sub-classing it to the Exception class. This allows custom exceptions to be generated (using throw) and caught in the same ... 2013-02-22, 2278👍, 0💬

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