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    <p>An important point about ThreadLocal variable is the global access. It can be accessed from anywhere inside the thread.inside any method which calls in that thread context. </p> <p>If you want to maintain a single instance of a variable for all instances of a class, you will use static-class member variables to do it. If you want to maintain an instance of a variable on a per-thread basis, you'll use thread-local variables. ThreadLocal variables are different from normal variables in that each thread has its own individually initialized instance of the variable, which it accesses via get() or set() methods.</p> <p>Let's say you're developing a multithreaded code tracer whose goal is to uniquely identify each thread's path through your code. The challenge is that you need to coordinate multiple methods in multiple classes across multiple threads. Without ThreadLocal, this would be a complex problem. When a thread started executing, it would need to generate a unique token to identify it in the tracer and then pass that unique token to each method in the trace.</p> <p>With ThreadLocal, things are simpler. The thread initializes the thread-local variable at the start of execution and then accesses it from each method in each class, with assurance that the variable will only host trace information for the currently executing thread. When it's done executing, the thread can pass its thread-specific trace to a management object responsible for maintaining all traces.</p> <p>Using ThreadLocal makes sense when you need to store variable instances on a per-thread basis.</p>
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    1. POHow threadlocal variable is different from a method level variable
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    1. USAshish Chaurasia
    1. USAshish Chaurasia
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    1. COIf they have a reference to the `ThreadLocal` object.
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      1. USSotirios Delimanolis
 

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