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low cost private jsp servlet '' A reference to this object is placed in the local variable person. A quick check shows that the variable has indeed taken on the personality of a string, with an object id, a type, and a value. So, is a variable an object? In Ruby, the answer is ``no.'' A variable is simply a reference to an object. Objects float around in a big pool somewhere (the heap, most of the time) and are pointed to by variables.
low cost private jsp servlet Let's make the example slightly more complicated. person1 = "Tim" person2 = person1 person1[0] = 'J' person1 » "Jim" person2 » "Jim" What happened here? We changed the first character of person1, but both person1 and person2changed from ``Tim'' to ``Jim.'' It all comes back to the fact that variables hold references to objects, not the objects themselves. The assignment of person1 to person2 doesn't create any new objects; it simply copies person1's object reference to person2, so that both person1 and person2 refer to the same object. We show this in Figure 3.
low cost private jsp servlet 1 on page 31. Assignment aliases objects, potentially giving you multiple variables that reference the same object. But can't this cause problems in your code? It can, but not as often as you'd think (objects in Java, for example, work exactly the same way). For instance, in the example in Figure 3.1, you could avoid aliasing by using the dup method of String, which creates a new String object with identical contents.
low cost private jsp servlet
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