String input computation expression

Write a method to input a string such as 3 + 2*5-4/2 and return 11:

Import java. util. collections;

Import javax. Script. scriptengine;
Import javax. Script. scriptenginemanager;

/**
* String calculate function class.
* @ Author Frank
* @ Since 11/18/2010
**/
Public class test {
Public static void main (string [] ARGs) throws exception {
System. Out. println ("input your expression now :");
Pipeline SC = new pipeline (system. In );
String mystring = SC. Next ();
Scriptengine JSE = new scriptenginemanager (). getenginebyname ("JavaScript ");
Double res = (double) JSE. eval (mystring );
System. Out. println (RES );
}

}

Using Java strings to process complicated logic requires many details. However, using Java to call the eval () method provided by JS is quite easy.