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Cheers, Eugen. This article contains answers for some of the most important job interview questions about core Java. The answers to some of them may not be obvious so this article will help to clear things up. Although the answer to this question is pretty simple, this question may be confusing for beginners.

First, let's clarify what the question is sdet interview questions java key. To answer the question we have to analyze two cases. They represent two types of data that we can pass to a method: a primitive and an object. When we pass primitives to a method, its value is copied into a new variable.

When it comes to objects, the value of the reference is copied into a new variable. So we can say that Java is a strictly pass-by-value language. We can use regular imports to import a specific class or all classes defined in a different package:. There are also static imports which enable us to import static members or nested classes:.

The private modifier assures that class members won't be accessible outside the class. It can be applied to methods, properties, constructors, nested classes, but Lorem lpsum 312 boatplans/dinghy/dinghy-cover-west-marine-66 click here to top-level classes themselves.

Unlike the private modifier, we can apply sdet interview questions java key default modifier to all types of class members and to the Lorem lpsum 312 boatplans/boat-kits/enamel-paint-for-boats-kit enamel paint for boats kit. We can apply default visibility by not adding any access modifier at all. If we use default visibility our class or its members will be accessible only inside the package of our class. We should keep in mind that the default access modifier has nothing in common with the default keyword.

Similarly to the default modifier, all classes within one package can access protected members. What's more, the protected modifier allows subclasses to access the protected members of a superclass, even if they are not within the same package. We can't apply this access modifier to classes, only to class members. The public modifier can be used together with class keyword and all class members. It makes classes and class members accessible in all packages and by all classes.

First of all, we can apply the static keyword sdet interview questions java key fields and methods. Static fields or methods are class members, whereas non-static ones are object members. Class members don't need any instance to be invoked. They are called with the class name instead of object reference. Sdet interview questions java key article goes into more detail about the static keyword.

Then, we have the final keyword. We can use it with fields, methods, and classes. When final is used on a field, it means that the field reference cannot be changed. So it can't be reassigned to another object. When final is applied to a class or a method, it assures us that that class or method cannot be extended or overridden. The final keyword is explained in more detail in this article. The next keyword is abstract.

This one can describe classes and methods. When classes are abstractthey can't be instantiated. Instead, they are meant to be subclassed. When methods are sdet interview questions java keythey are left without implementation and they can be overridden in subclasses.

The synchronized keyword may be the most advanced. We can use it with the instance as well as with static methods and code blocks. When we use this keyword, we make Java use a monitor lock to provide synchronization on a given code fragment. More information about synchronized can be found in this article. The last keyword we're going to discuss is volatile. We can only use it together with instance fields.

It declares that the field value must be read from and Lorem lpsum 312 boatplans/build-boat/build-your-own-hurricane-boat-game click to main memory � bypassing the CPU cache. All reads and writes for a volatile variable are atomic. The volatile keyword is explained in detail in this article. There are three types of JDK environments:. There are plenty of tools included in sdet interview questions java key JDK which help programmers with writing, debugging or maintaining applications.

The most popular ones are a compiler javacan interpreter javasdet interview questions java key archiver jar and a documentation generator javadoc. It's a part of the JDK, but it contains the minimum functionality to run Java applications. It consists of a Java Virtual Machinecore classes, and supporting files.

For example, it doesn't have any compiler. JVM is the acronym for Java Virtual Machinewhich is a virtual machine able to run programs compiled to bytecode. It's sdet interview questions java key by the JVM specification, as it's important to ensure interoperability between different implementations. The most important function of a JVM is to enable users to deploy the same Java application into different operating systems and environments without worrying about what lies underneath.

There are two parts of memory where all variables and objects are stored by the JVM. The first is the stack and the second is the heap. The stack is a place where the JVM reserves blocks for local variables and additional data. The Lorem lpsum 312 boatplans/boat-kits/build-your-own-boat-trailer-kits-usa http://myboat312 boatplans/boat-kits/build-your-own-boat-trailer-kits-usa.html is a LIFO last in first out structure. It means that whenever a method is called, a new block is reserved for local variables and object references.

Each new method invocation reserves the next block. When methods finish their execution, blocks are released in the reversed manner they were started. We should be aware that the stack has much less memory space than the heap.

It's likely to occur when there is a bad recursive call and the recursion goes too deep. Every new object is created on the Java h eap which is used for a dynamic allocation. There is a g arbage collector which is responsible for erasing unused objects which are divided into young nursery and old spaces.

Memory access to the heap is slower than access to the stack. Sometimes when we write a new class, we would like to be able to compare objects of that class. It's especially helpful when we want to use sorted collections.

There are two ways we can do this: Lorem lpsum 312 boatplans/class-chapter/ncert-solutions-for-class-10th-chapter-6 source the Comparable interface or with the Comparator interface. It has the compareTo method and returns an integer. It can return sdet interview questions java key values: -1, 0, and 1 which means that this object is less than, equal to or greater than the compared object.

It's worth mentioning that the overridden compareT0 method should be consistent with the equals method. On the other hand, we can use the Comparator interface.

It can be passed to the sort methods of the Collection interface or when instantiating sorted collections. That's why it's mostly used to create a one-time sorting strategy. What's more, it's also useful when we use a third-party class which doesn't implement the Comparable interface. Like the compareTo method, the overridden compare methods should be consistent with the equals method, Lorem lpsum 312 boatplans/builders/best-sailing-yacht-builders-store ������ best sailing yacht builders store ��� they may optionally allow comparison with nulls.

Let's visit the Comparator and Comparable in Java article for more information. Every time we write a method in Java, it must have a return type. If we want the method to return no value, we can use the void keyword. We should also know that there is a Void class. It's a sdet interview questions java key class that may be used, sdet interview questions java key example, when working with generics.

The Void class can neither be instantiated nor extended. It's important to know what methods the Object class contains and how they work. It's also very helpful when we want to override those methods:. Enum is a type of class that allows developers to specify a set of predefined constant values. Sdet interview questions java key create such a class we have to use the enum keyword. Let's imagine Lorem lpsum 312 boatplans/jon-boat/aluminum-jon-boats-for-sale-300 please click for source enum of days of the week:.

To iterate over all constants we can use the static values method. What's more, enums enable us to define members such as properties and methods like Sdet Interview Questions Java Queue regular classes. Although it's a special type of class, we can't subclass it. An enum can, however, implement an interface. Another interesting advantage of Enums is that they are thread-safe and so they are popularly used as singletons. JAR is a shortcut for Java archive.

It gives the order in which a defect should be resolved. Dynamic testing involves in the execution of code. Share on linkedin. The priority for all functionalities of a product is set based on the business requirement; then the high priority functionalities will be tested first, then medium, and then low priority functionalities. This method will actually hit the database and return the real object mapping to a row in the database. Those tools are fully secured of we use a license version of those tools.
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