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Q1).hat is the different use of this statement in java?
This is a keyword in java used for referring same class instance variable, same class method, returning same class instance.
Q2).What is run time polymorphism in java?
In java, calling to a method is defined based on the type of object created in runtime. That is run time polymorphism.
Q3).Which method is used to convert String to Char?
by using toCharArray();
Q4).Is it possible to have static method in method overloading?
Yes its possible as method overloading depends only on the number of the argument and data type.
Q5).In a class can a local variable be static?
Q6).Is it possible to call finally block after throwing an exception?
Yes. Finally, will always be executed.
Q7).Is finally block always executed?
No. In case of System. exit() it won’t be executed.
Q8).What are the OOPs concept in java?
Inheritance, Abstraction, Polymorphism, Encapsulation, Interface
Q9).Why String is immutable?
As, once the String object is created cannot be modified
Q10).Is multiple inheritance possible in java?
No. Its possible only through interface.
Q11).Can a Interface have complete method.
Yes. After java ver 8, Interface can have complete methods but the method should be static and default.
Q12).Is it possible to have auto widening and auto narrowing in java?
Auto widening is possible but auto narrowing is not.
Q13).Why auto narrowing is not possible in java?
In auto narrowing there is always a loss of memory. So its not possible.
Q14).Where the String objected created?
The string objects are created in String pool area.
Q15).If a String s= “Hi I am Good”. How to separate each word of a String?
By using Split(“ ”) method
Q16).What is encapsulation in java?
In java encapsulation is property, where we hide data member by declaring them as private and try to access them through public methods.
Q17).What is difference in HashMap and HashTable in java?
HashMap can have a Null key and Multiple Null values but HashTable can not have Null key and Null values.
Q18).What is the difference in List and Set in java?
List can have duplicate element but St only have unique element.
Q19).What is recursion in java?
In Java, recursion is a process where a method with in a class calls itself inside the class.
Q20).hat is the difference in finally and finalize in java?
Finally, is a java block where finalize is used in garbage collection.
Q21).Can we override static methods in java?
No We cannot override static methods in java.
Q22).What is the difference in Collections and Collection in java.
Collection is an interface in java whereas Collections is a utility class has static java methods inside it.
Q23).What is the difference in Poll and Peak in java collection?
In java collection, poll is used for retrieve data and release memory permanently, but Peak used to retrieve data and release memory temporarily.
Q24). What is boxing and unboxing in java?
In java boxing is used to convert wrapper class to object type and Unboxing is used to get object from wrapper class.
Q25).What is java polymorphism?
In java, an entity is showing different behaviors at different instance of time is known as polymorphism.
Q26).What is java constructor?
When we want to perform an operation/action when an object is created we used constructors.
Q27).What are the different type of constructor?
Java has default and parameterized constructor.
Q28).Which package is used for file reading and writing in java?
Java I/O package is used
Q29).In java how to take input from user?
By using Scanner class
Q30).Wat is the difference in array list and linked list ?
Arraylist store memory as continuous memory location but linked list store in random memory locations
Q31).What are different locators in selenium?
ID, name,xpath,CSS,class name, tag name, link text, partial linktext
Q32).What is a web driver ?
Webdriver is an Interface which provide different APIs to perform automation across browsers.
Q33).How to handle select/ dropdown option in selenium?
By using Select class
Q34).How to handle dynamic xpath in selenium?
by using methods such as, text(),Contains(), parent,child,following-siblings,ansestors etc
Q35).How to handle multiple windows in selenium?
By using getWindowHandle()
Q36).What is the difference in getWindowHandle() and getWindowHandles() in selenium?
getWindowHandle() return a String but getWindowHandles() return a collections of String
Q37).How to handle windows popup in selenium?
By using AutoIT
Q38).How to perform keyboard operation in selenium?
By using Action class
Q39).What is Soft assert in selenium?
In selenium soft assert is used to continue the execution without failing the test if any assertion fails. In the end it will collect all exception and fail the test.
Q40).What is ITest result in selenium?
ITest result in selenium is an Listener API used to monitor the execution status of test
Q41).What is the test NG annotations?
@test, @ BeforeMethod, @AfterMethod,@ BeforeClass,@AfterClass, @ Beforegroup, @AfterGroup
Q42).How to Disable an execution of test in TestNG?
Q43).How to handle cookies in selenium?
By using getCookies();
Q44).How to delete cookie by name in selenium?
Q45).How to set SSL certificate in selenium?
Q46).hat is Frame handling in selenium?
Frames are different HTML page within a page. In selenium we use driver.switchto.frame()
Q47).In java what is checked exception?
Checked exception are the exception checked by the compiler.
Q48).What is different variable type sin java?
Local , Instance, Static
Q49).What is toString() in java?
toString() is used for String representation of objects.
Q50).What is Selenium grid?
Selenium grid is used to run multiple test across different browsers.