[Solved] Variable might not have been initialized in Java

In this article, we are going to solve a common problem variable might not have been initialized in Java.

This error occures when we declare variable but forgot to initialize them.
Variable creation is a two step process, first is variable declaration int a; int b; etc and second is variable initialization a=10; b=20 ect. If we forgot to initialize the variable then we get this error.
Let’s understand the error with the help of examples.

Note: This error occures only with local variables because compiler does not set default value for the local variables. In case of instance variables, compiler set default values for example, 0 for integer, null for string, etc.

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Problem: variable might not have been initialized

In this example, we created a variable count_even but did not initialize with value and when we use this variable, compiler generates an error message. See the example and output.

Output

Error: Unresolved compilation problems: The local variable count_even might not have been initialized

Solution for Error: variable might not be initialized in java

Solution 1: Initialize the variable

The first and easy solution for this error is to initialize the uninitialized variable. Set a value for this variable and error will gone. See the example below.

Output

Total Even Numbers : 2

Solution 2: Declare variable as instance variable

This is another solution that says declare your variable as instance variable. In this case, compiler will automaticaly set a default value for the variable and error will gone. See the example below.

Output

Total Even Numbers : 2

Solution 3: Declare variable in else block

You might get variable might not have been initialized when you initialize variable in if block.

Output

Compilation failed due to following error(s).Main.java:20: error: variable count_even might not have been initialized

You can initialize variable count_even in else block as well to resolve this issue.

That’s all about how to resolve variable might not have been initialized in java.

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