JAVA: Your CODE  will take an infix algebraic expression as an input from user. It will check that whether it is a valid expression or not. Then It will be converted into postfix expression, and at the end it will be evaluated and print the result of the expression. For example: if input is: (3+5)*(7 output: it is invalid. If input is: (3+5)*7 , display Postfix form: 35+7* Answer: 56.

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