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Himanshu S.
Principal Software Engineer with 10+ years of experience
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Java Programming
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Question:

What do you understand by Immutable class? Give examples of Immutable classes from core java library.

Himanshu S.

An immutable object is one that will not change state after it is instantiated. In general, an immutable object can be made by defining a class which does not have any of its members exposed and does not have any setters. The following class will create an immutable object: class ImmutableInt { private final int value; public ImmutableInt(int i) { value = i; } public int getValue() { return value; } } String class and primitive wrapper classes like Integer, Float are an example of immutable classes from core java library.

Basic Math
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Question:

Solve (x - 3)^2 = 4

Himanshu S.

x - 3 = ±2 Square root property x = 3 ± 2 Add 3 to both sides x = 3 + 2 or x = 3 - 2 Two solutions x = 5, 1

Algebra
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Question:

The ages of the two persons differ by 20 years. If 5 year ago, the older one be 5 times as old as the younger one, then their present ages, in years are:

Himanshu S.

Let the age be x and y years now. Then, x−y=20 and (x−5)=5(y−5) On solving both equations we get: x=30 and y=10

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