Term
| What is the difference between static methods and instance methods? |
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Definition
| instance method belongs to the instance of a class therefore it requires an instance before it can be invoked, whereas static method belongs to the class itself and not to any class instance so it doesn’t need an instance to be invoked. |
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Term
| Can static block throw exception? |
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Definition
| Yes, static block can throw only Runtime exception or can use a try-catch block to catch checked exception |
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Term
| What is difference between abstract class and interface? |
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Definition
| A class is called abstract when it contains at least one abstract method. Interface can contain only abstract( non implemented) methods. |
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Term
| describe when to use abstract class and interface? |
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Definition
| When we talk about abstract classes we are defining characteristics of an object type, specifying what an object is but in the case of an interface we define a capability and we bond to provide that capability, we are talking about establishing a contract about what the object can do. |
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Term
| Does java support multiple inheritance? |
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Definition
| Java doesnt support multiple inheritance. |
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Term
| Can the this keyword be assigned a null value? |
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Definition
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Term
| What are the different types of references in java? |
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Definition
| Strong Reference, Soft Reference ,Weak Reference ,Phantom Reference |
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Term
| Does java support pass by value or pass by reference? |
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Definition
| Java supports only pass by value |
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Term
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Definition
| you are passing a copy of the variable. |
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Term
| what is pass by reference? |
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Definition
| you are passing a pointer to the variable |
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Term
| What is the difference between equals() and ==? |
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Definition
== operator is used to compare the references of the objects.
equals() method can be used to compare the values of two objects |
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