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Understand assignment operators.

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Java Using operators

Assignment operators
You can assign a primitive variable using a literal or the result of an expression. The result of an expression involving integers ( int , short , and byte ) is always at least of type int . Narrowing conversions are not allowed, as they would result in the loss of precision. For instance:

byte b = 5;
byte c = 4;
byte d = b + c; // does not compile because int cannot fit in a byte

float f = (float)35.67; // implicitly double, so casting to float
float f = 35.67F;

A boolean cannot be assigned any type other than boolean.
If we assign an existing object reference to a reference variable, both reference variables refer to the same object.

It is legal to assign a child object to a parent object, but the reverse is not allowed. You can also assign an object reference to an interface reference variable, if the object implements that interface.


 

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