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Java - Typecasting from Java.lang.Object to an instance of a custom Class
MyObject someObj = ...;
Stack myStack = new Stack();
myStack.push(someObj);
someObj = myStack.pop(); // Error!

MyObject someObj = ...;
Stack<MyObject> myStack = new Stack<MyObject>();
myStack.push(someObj);
someObj = myStack.pop(); // Now this works!

MyObject someObj = ...;
Stack myStack = new Stack();
myStack.push(someObj);
someObj = (MyObject) myStack.pop(); // This works too, but is considered very bad style

my_class myObj = (my_class)obj;

Stack<my_class> myStack = new Stack<my_class>();

java.util.Stack<myObject> myStack = new java.util.Stack<myObject>();