What does "PersonBean myBean =(PersonBean)request.getAttribute("myBean");" mean in Java? -

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i learning java , came accross code example. 

personbean mybean =(personbean)request.getattribute("mybean"); if(mybean=null) {   mybean = new personbean();   request.setattribute("mybean",mybean); }

here personbean mybean =(personbean)request.getattribute("mybean"); doing? mean in if statement there statement constructs object of class . purpose of first line here? can break down me ?

this code gets "mybean" attribute request object (which contains incoming objects) , casts personbean. if not successful creates new personbean object name "mybean" , sets "mybean" object in request.


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