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How to cast in Java

Educative Answers Team

Casting is the act of converting one of the variables into another. There are two types of casting in Java:

Type hierarchy in Java

Before learning to cast variables, you should know the type hierarchy:

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Type hierarchy

1. Implicit

Implicit casting is when you assign the value of the old variable, to the new variable, without any additional code. However, this is only valid if a narrower variable is being converted into a wider one (e.g. converting int into double). Polymorphism, when an object of a child (narrower) class is referred to by a reference variable of the parent (wider) class, is an example of this.

byte i = 10;
long newType = i;

2. Explicit

Explicit casting is the opposite of implicit casting. It is used when we have to convert a wider variable to a narrower one; but this time, we have to explicitly write the type we are converting to in (). Otherwise, a compile-time error will occur.

double d = 50;
int x = (int)d;


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