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Jan 18, 2010 · Local variables do not get a default value. The compiler complains if you try to use a local variable before before the variable is initialised. However, instance variables always get a default value. If you don't explicitly assign a value to an instance variable, the instance variable still has a value. integers 0. floating points 0
Oct 30, 2021 · Although not the case here, if having a redundant local variable is desired (I've had one time where this was the case - without getting into specifics), here's how to suppress this specific warning. @SuppressWarnings("UnnecessaryLocalVariable") public double depreciationAmount() { double depreciationAmount = (cost * percentDepreciated); return depreciationAmount; }
Aug 6, 2012 · @npinti: I can't agree with you, nor agree with Java Compiler if that's really what it does. In most of the programming language, when there're same-name variables defined among different scopes, it always use innermost scope's declaration first. If Java is not this case, I can only say Java is a "weird" programming language. >"< –
Local variables and primitives should be initialized before use because you would know what to expect from the values. Historically, when a new variable was created it would contain random values from the memory [and one could not predict the value]. Java also requires this because it prevents the presence of orphaned variables.
Dec 14, 2017 · In the following example count behaves like a static local variable, that you might use in C: public class Foo { private int count = 0; public int getCount() { return count++; } } There are no static local variables like other languages support. Since java is very "class"-oriented, it tries to bring it to that context.
Apr 5, 2017 · In order to use a method's local variable inside a nested class, the variable must either be either final or "effectively final", where the latter means that the compiler can prove that that the variable's value will not change during the entire execution of the method. If that condition were not satisfied then the semantics of the nested class ...
May 3, 2009 · This is some hack on making instance variable in a method to be accessed like a local variable. As you aware method local variable is only available to the thread, one difference is; method local variables will not available to the thread once method execution is over where as mutable object shared with threadlocal will be available across multiple methods till we clean it up.
Jun 6, 2014 · It offers solutions to cross-cutting concerns, or global variable usage. Spring is a Java framework that utilizes AOP, and while it is traditionally used for web-applications, the core application can be used universally throughout the Java framework (8.0 included). This might be a direction you want to explore more.
Feb 19, 2014 · I am new to Java Programming and I am stuck as how to convert local variable into Class Variables. The way I knew is to declare the variable outside method, but the value of that variable is initialize inside a method, When I use that method outside the method, it gives me null. Please let me, how can I do that. Thanks in Advance.
Jan 21, 2016 · I believe your question contradicts itself. If warning text says "local variable", then it's not a field and cannot be declared private. The warning for a private field would say "The value of the field is not used". Well, at least that's what Eclipse does. –
