Evaluating a math expression given in string form. You can evaluate expressions easily if your Java application already accesses a database, without using any other JARs. Some databases require you to use a dummy table eg, Oracles dual table and others will allow you to evaluate expressions without selecting from any table. RCHGu320lo/sddefault.jpg' alt='Java Program Convert Infix Postfix Notation' title='Java Program Convert Infix Postfix Notation' />For example, in Sql Server or Sqliteselect 1. Oracleselect 1. The advantage of using a DB is that you can evaluate many expressions at the same time. Also most DBs will allow you to use highly complex expressions and will also have a number of extra functions that can be called as necessary. However performance may suffer if many single expressions need to be evaluated individually, particularly when the DB is located on a network server. The following addresses the performance problem to some extent, by using a Sqlite in memory database. Hp Smartstart 10.10 Download. Java2s. com Emailinfo at java2s. Demo Source and Support. All rights reserved. Heres a full working example in Java. Class. for. Nameorg. JDBC. Connection conn Driver. Manager. get. Connectionjdbc sqlite memory. Statement stat conn. Statement. Result. Free Stationery Templates To Download. Set rs stat. execute. Query select 11. System. Big. Decimal1. The Postfix notation is used to represent algebraic expressions. The expressions written in postfix form are evaluated faster compared to infix notation as. Of course you could extend the above code to handle multiple calculations at the same time. Result. Set rs stat. Query select 11. Express Helpline Get answer of your question fast from real experts.