Description: Design a simple calculator that can be four operations: addition, subtraction, multiplication, division, etc. (limited to the decimal) requirements: 1 Operating symbol as:. " Ppls" , " -" , " *" , " /" , , " (" , " )" , etc. (According to international practice design) 2. Users clicking through the various components of the panel input expression should be displayed above the text box. 3 When the user clicks the " =" , the previous contents of the text box should be emptied directly display expression calculation result. For example: Enter the expression " 3+2* (8-5)" then press " =" to display the results of " 9." 4 has a menu bar, the corresponding edit " Copy" , " Paste" and other menus, provide the appropriate functionality.
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Calculater\Calculater.java
..........\Calculatertest.java
Calculater
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