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Q71. Can we override behavior of a collection class ? How ?

Ans. Yes. We can do that.

1. We can create own own implementation class extending the collection class and then override the behavior method.

2. We can override the behavior at the time of instantiation of class as following

List<MyType> list = new ArrayList<MyType>() {
public boolean add(MyType mt) {
super.add(mt);
Collections.sort(list, comparator);
return true;
}
};

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Q72. What is the difference between map and filter methods in streams ?

Ans. By using map , you can transform the object values. The map operation allows us to apply a function, that takes input parameter of one type, and returns something else.

Filter is used for filtering the data, it always returns the boolean value. If it returns true, then item is added to list else its filtered out (ignored)

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Q73. How abstraction works

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Q74. Explain how a class is loaded ?

Ans. Java classLoder is resposible to load java classes.

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Q75. What if we use all access specifiers ? Is it encapsulation ?

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Q76. Difference between class and object with example.

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Q77. Is there a way to access a private method from an outside class ?

Ans. Through Reflection.

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Q78. What are the different types of inheritance ?

Ans. Single Level
Multi Level
Hierarchical
Multiple
Hybrid

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Q79. Why in Java does it require "static" in the main function?

Ans. Because there needs to be a starting point till when there is no object created in memory and hence it needs to be run in static scope

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Q80. Is it possible to have a static class ?

Ans. We can have a static inner class but not static outer class.

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Q81. Difference between List and LinkedList ?

Ans. A List is an child interface of collection interface in java where as Linked list is and implementation class of List interface which has doubly linked as a underlying data structure

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Q82. Why packages are used in Java ?

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Q83. What is meant by platform ? Which platform does java provides ?

Ans. platform is the hardware or software environment in which a program runs. There are two types of platforms software-based and hardware-based. Java provides software-based platform.

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Q84. How can we drop cookies through back end code ? Does it transfer the cookie file to the client ?

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Q85. Is it front end code or the back end code , that drops the cookies ?

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Q86. Write an algorithm for square root of a given number.

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Q87. Which is faster, LinkedList or ArrayList?

Ans. ArrayList is fast for random access, but is slow on deletion and insertion.

LinkedList is slow for random access, but is fast on deletion and insertion.

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Q88. Difference between function overloading and method overloading?

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Q89. Which interface is used for hashset implementation ?

Ans. HashSet implements Set interface.

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Q90. why string pool concept for only String but not for StringBuffer ?

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Q91. why string pool concept for only String but not for StringBuffer ?

Ans. As String is immutable so by maintaining pool area we can refer the object to same area if they are with same content. But when it comes to string buffer or builder then due to mutable property if we do so then all the objects referring to that area will from now has new content.. So as to avoid this pool is present only in string.

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Q92. Can you give me a use case where you utilized serialization in your project code?

Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization

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Q93. Write program to recursively iterate through map ?

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Q94. Difference between interface and inheritance

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Q95. Combine and join integer and string list to single list and sort.

Ans. Object[] combined = new Object[first.length second.length];
System.arraycopy(first, 0, combined, 0, first.length);
System.arraycopy(second, 0, combined, first.length, second.length);

-- OR --

Object[] combined = Stream.concat(Arrays.stream(first), Arrays.stream(second)).toArray();

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Q96. What are the 22 possible values of x where x== -x (true) ?

Ans. byte x = 0;
short x = 0;
char x = 0;
int x = 0;
int x = Integer.MIN_VALUE;
float x = 0.0f;
float x = -0.0f;
long x = 0;
long x = Long.MIN_VALUE;
double x = 0.0;
double x = -0.0;
Byte x = 0;
Short x = 0;
Character x = 0;
Integer x = 0;
Integer x = Integer.MIN_VALUE;
Float x = 0.0f;
Float x = -0.0f;
Long x = 0L;
Long x = Long.MIN_VALUE;
Double x = 0.0;
Double x = -0.0;

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Q97. Can we increase the buffer size while working with Buffered Streams ? How ?

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Q98. Can we disable auto flushing for PrintWriter ?

Ans. Yes

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Q99. Have you ever faced any problem because of PrintWriter buffer and autoflush mechanism ? How did you got rid of it ?

Ans. Yes , we faced trouble once wherein we were trying to set certain elements to the PrintWriter. As in some cases the PrintWriter held too much information and hence it would get flushed before we could append those elements.

We disabled auto flushing and provided our own explicit flushing.

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Q100. How do you debug Javascript code ?

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