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Mortgagecalc.Java Essay Preview: Mortgagecalc.Java Report this essay //Import statements import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.text.DecimalFormat; import javax.swing.JOptionPane; //class header //Frame=top-level container | the MortgageCalc class will be a subclass of “Frame” //ActionListener tells program to listen for/respond to user event public class MortgageCalc extends Frame implements ActionListener //declare variables private Button calculateBTN; private.