Please use Java language in an easy way with comments!
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Write a static method called "evaluate" that takes a string as a
parameter. The string will contain a postfix expression, consisting
only of integer operands and the arithmetic operators +, -, *, and
/ (representing addition, subtraction, multiplication, and division
respectively). All operations should be performed as integer
operations. You may assume that the input string contains a
properly-formed postfix expression. The method should return the
integer that the...