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[code] import java.util.*; import java.text.*; import javax.swing.*; class Lab4Part2{ public static void main (String[] args) { String ex1; Double num, F; final int a=0, b=0; JFrame myWindow=new JFrame(); myWindow.setSize(500,400); myWindow.setTitle("Calculator"); myWindow.setVisible(true); myWindow.setLocation(600,200); ex1=JOptionPane.showInputDialog(myWindow, "Enter an expression"); F=Double.parseDouble(ex1); num=(a+b); JOptionPane.showMessageDialog(myWindow, "The sum is "+num); } } [/code] I need some help …
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