Interview Questions.

Q1. Explain The Advantages And Disadvantages Of Using Jni?

Advantages of JNI

Using JNI, we can access c and c++ code which provides overall performance raise to JAVA.

JNI permits JAVA to get entry to a few hardware capabilities using other languages like c and c++.

Disadvantages of JNI

JNI uses native languages which mean it has portability problem.

Code debug is big problem for the builders who use JNI features in JAVA.

Q2. Define Jni Functions And Pointers?

JNI features are those which might be utilized by the builders to engage with JVM within a local approach. Every JNI feature gets a special parameter as its first argument – JNIEnv ; which factors to a special JNI information structure of the kind JNIEnv_ . One of the elements of JNI statistics structure is a ‘pointer to an array’ generated with the aid of JVM, and every detail of this array is again a pointer to a JNI function.

A JNI characteristic can be invoked from the native method by using referencing those hints. Every JVM offers a unique implementation of the JNI features.

Q3. Is There An Alternative To Jni On Macos?

If you need to call Mac OS C code from your Java code, there are presently two mechanisms for doing so: JDirect2 and the Java Native Interface (JNI).

Q4. What Is Jni?

JNI stands for Java Native Interface. It is an interface between Java, programs and libraries that are written in other languages. JNI is solely used to have interaction with “local” code (code written in gadget stage language consisting of C). For example, JNI enables using C libraries and C applications to be used in Java packages.

Q5. What Is Jawin?

The Java/Win32 integration challenge is loose, open source architecture for interoperation among Java and components exposed through Microsoft.

Q6. What Is Swt?

SWT is the software program component (part of the Eclipse IDE Framework) that grants native widget functionality for the Eclipse platform in an operating.

Q7. Explain Exception Handling In Jni?

JNI exceptions are treated via using the following:

Throw( ): Throws an existing exception item. Used in native methods to rethrow an exception.

ThrowNew( ): Creates a brand new exception object and throws.

ExceptionOccurred( ): Determines the exception repute of throws and now not yet cleared.

ExceptionDescribe( ): Displays the exception and stack hint

ExceptionClear( ): A pending exception is cleared.

FatalError( ): Causes a deadly blunders to elevate and does now not go back.

Q8. How Can I Access Java From Python (and The Other Way Around)? Are There Any Jni Wrappers Which Can Bridge The Gap Between The Two?

JPE (Java-Python Extension) is an open-supply attempt for seamless inter-operability between Java and Python. Java-Python Extension main site JPE.

Q9. Is There A Tcl-java Bridge?

Yes, The Tcl/Java task currently has  packages, Jacl and Tcl Blend. Jacl, which stands for Java Command Language, is a Java implementation of Tcl…

Q10. How Can I Create Standalone Java Applications That Can Be Launched Just Like Any Other Mac Os Application?

You can use JManager API or JBindery to achieve this. Here’s an editorial that indicates you a way to create a wrapper program around a Java utility:

Q11. What Is Native Interface In Java?

JNI is the mechanism used to invoke techniques written in languages which include c and C++. You can write code using language like c and c++ and declare its local methods and might use the same technique in java the use of JNI.

JNI exposes JNI features and tips that can get right of entry to java gadgets and methods.