Applet still not initialized.

Question

Hello, I am a student attempting to complete a GUI Currency Converter. My applet will not initialize. I have read through some of the Applet initialization errors but am having some trouble understanding where to proceed. My code is rather large, about 400 lines, so I won't post the thing. I have only done very basic Java, and so I am very new to this. Thank you for your help.

Answer 1

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.util.*;
public class CurrencyApp extends JApplet
          implements ActionListener
     public int currency1;
     public int currency2;
     public ButtonGroup group1;
     public ButtonGroup group2;
     public JToggleButton button0;
     public JToggleButton button1;
     public JToggleButton button2;
     public JToggleButton button3;
     public JToggleButton button4;
     public JToggleButton button5;
     public JToggleButton button6;
     public JToggleButton button7;
     public JToggleButton button8;
     public JToggleButton button9;
     public JToggleButton button10;
     public JToggleButton button11;
     public JToggleButton button12;
     public JToggleButton button13;
     public JToggleButton button14;
     public JToggleButton button15;
     public JToggleButton button16;
     public JToggleButton button17;
     public JToggleButton button18;
     public JToggleButton button19;
     public JToggleButton button20;
     public JToggleButton button21;
     public JTextField inputfield;
     public JLabel outputlabel;
     String s1;
     public void init()
     JToggleButton button0= new JToggleButton("Euros");
     JToggleButton button1= new JToggleButton("Canadian Dollars");
     JToggleButton button2= new JToggleButton("British Pounds Sterling");
     JToggleButton button3= new JToggleButton("Japanese Yen");
     JToggleButton button4= new JToggleButton("Mexican Pesos");
     JToggleButton button5= new JToggleButton("Danish Kroner");
     JToggleButton button6= new JToggleButton("Russian Rubles");
     JToggleButton button7= new JToggleButton("Indian Rupees");
     JToggleButton button8= new JToggleButton("Australian Dollars");
     JToggleButton button9= new JToggleButton("Swiss Francs");
     JToggleButton button10= new JToggleButton("US Dollars");
     button0.addActionListener(this);
     button1.addActionListener(this);
     button2.addActionListener(this);
     button3.addActionListener(this);
     button4.addActionListener(this);
     button5.addActionListener(this);
     button6.addActionListener(this);
     button7.addActionListener(this);
     button8.addActionListener(this);
     button9.addActionListener(this);
     button10.addActionListener(this);
     group1.add(button0);
     group1.add(button1);
     group1.add(button2);
     group1.add(button3);
     group1.add(button4);
     group1.add(button5);
     group1.add(button6);
     group1.add(button7);
     group1.add(button8);
     group1.add(button9);
     group1.add(button10);
     Box box=Box.createVerticalBox();
     box.add(button0);
     box.add(Box.createHorizontalStrut(10));
     box.add(button1);
     box.add(Box.createHorizontalStrut(10));
     box.add(button2);
     box.add(Box.createHorizontalStrut(10));
     box.add(button3);
     box.add(Box.createHorizontalStrut(10));
     box.add(button4);
     box.add(Box.createHorizontalStrut(10));
     box.add(button5);
     box.add(Box.createHorizontalStrut(10));
     box.add(button6);
     box.add(Box.createHorizontalStrut(10));
     box.add(button7);
     box.add(Box.createHorizontalStrut(10));
     box.add(button8);
     box.add(Box.createHorizontalStrut(10));
     box.add(button9);
     box.add(Box.createHorizontalStrut(10));
     box.add(button10);
     box.add(Box.createHorizontalStrut(10));
     JToggleButton button11= new JToggleButton("Euros");
     JToggleButton button12= new JToggleButton("Canadian Dollars");
     JToggleButton button13= new JToggleButton("British Pounds Sterling");
     JToggleButton button14= new JToggleButton("Japanese Yen");
     JToggleButton button15= new JToggleButton("Mexican Pesos");
     JToggleButton button16= new JToggleButton("Danish Kroner");
     JToggleButton button17= new JToggleButton("Russian Rubles");
     JToggleButton button18= new JToggleButton("Indian Rupees");
     JToggleButton button19= new JToggleButton("Australian Dollars");
     JToggleButton button20= new JToggleButton("Swiss Francs");
     JToggleButton button21= new JToggleButton("US Dollars");
     button11.addActionListener(this);
     button12.addActionListener(this);
     button13.addActionListener(this);
     button14.addActionListener(this);
     button15.addActionListener(this);
     button16.addActionListener(this);
     button17.addActionListener(this);
     button18.addActionListener(this);
     button19.addActionListener(this);
     button20.addActionListener(this);
     button21.addActionListener(this);
     group2.add(button11);
     group2.add(button12);
     group2.add(button13);
     group2.add(button14);
     group2.add(button15);
     group2.add(button16);
     group2.add(button17);
     group2.add(button18);
     group2.add(button19);
     group2.add(button20);
     group2.add(button21);
     inputfield.addActionListener(this);
     Box box2=Box.createVerticalBox();
     box2.add(button11);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button12);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button13);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button14);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button15);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button16);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button17);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button18);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button19);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button20);
     box2.add(Box.createHorizontalStrut(10));
     box2.add(button21);
     box2.add(Box.createHorizontalStrut(10));
     JTextField input=new JTextField("Input the amount you have here:", 5);
     JLabel output= new JLabel("Here is the converted amount:", 5);
     Container c=getContentPane();
     c.add(box, BorderLayout.WEST);
     c.add(box2, BorderLayout.EAST);
     c.add(inputfield, BorderLayout.CENTER);
     c.add(outputlabel, BorderLayout.SOUTH);
          public void actionPerformed(ActionEvent F)
          JToggleButton f= (JToggleButton)F.getSource();
          if(f == button0) currency1= 0;
          else if(f == button1) currency1=1;
          else if(f == button2) currency1=2;
          else if(f == button3) currency1=3;
          else if(f == button4) currency1=4;
          else if(f == button5) currency1=5;
          else if(f == button6) currency1=6;
          else if(f == button7) currency1=7;
          else if(f == button8) currency1=8;
          else if(f == button9) currency1=9;
          else if(f == button10) currency1=10;
          else if(f == button11) currency2= 0;
          else if(f == button12) currency2=1;
          else if(f == button13) currency2=2;
          else if(f == button14) currency2=3;
          else if(f == button15) currency2=4;
          else if(f == button16) currency2=5;
          else if(f == button17) currency2=6;
          else if(f == button18) currency2=7;
          else if(f == button19) currency2=8;
          else if(f == button20) currency2=9;
          else if(f == button21) currency2=10;
          String s1=(String)F.getSource();
          s1=inputfield.getText();
          inputfield.setText(s1+"");
          double input= Double.parseDouble(s1);
          double output=this.calculate(input);
          String s2=String.valueOf(output);
               public double calculate (double x)
               switch (currency1){
                    case 0: switch (currency2) {
                         case 0: x=x;
                         case 1: x=x*1.51;
                         case 2: x=x*0.69;
                         case 3: x= x*125.19;
                         case 4: x=x*12.64;
                         case 5: x=x*7.43;
                         case 6: x=x*34.22;
                         case 7: x=x*51.97;
                         case 8: x=x*1.61;
                         case 9: x=x*1.57;
                         case 10: x=x*1.15;}
                    break;
                    case 1: switch (currency2){
                         case 0: x=x*0.66;
                         case 1: x=x;
                         case 2: x=x*0.46;
                         case 3: x=x*82.86;
                         case 4: x=x*8.36;
                         case 5: x=x*4.92;
                         case 6: x=x*22.65;
                         case 7: x= x*34.4;
                         case 8: x=x*1.07;
                         case 9: x=x*1.04;
                         case 10: x=x*0.76;}
                    break;
                    case 2: switch (currency2) {
                         case 0: x=x*1.43;
                         case 1: x=x*2.2;
                         case 2: x= x;
                         case 3: x= x*182.54;
                         case 4: x= x*18.78;
                         case 5: x=x*10.65;
                         case 6: x=x*49.99;
                         case 7: x=x*75.99;
                         case 8: x=x*2.35;
                         case 9: x= x*2.24;
                         case 10: x= x*1.69;}
                    break;
                    case 3: switch (currency2) {
                         case 0: x= x*0.0079;
                         case 1: x= x*0.012;
                         case 2: x= x*0.0055;
                         case 3: x= x;
                         case 4: x= x*0.1031;
                         case 5: x= x*0.0585;
                         case 6: x= x*0.2746;
                         case 7: x= x*0.4198;
                         case 8: x= x*0.0128;
                         case 9: x= x*0.0123;
                         case 10: x= x*0.0093;}
                    break;
                    case 4: switch(currency2) {
                         case 0: x= x*0.0763;
                         case 1: x= x*0.117;
                         case 2: x= x*0.0531;
                         case 3: x= x*9.69;
                         case 4: x= x;
                         case 5: x= x*0.5674;
                         case 6: x= x*2.66;
                         case 7: x= x*4.07;
                         case 8: x= x*0.1243;
                         case 9: x= x*0.119;
                         case 10: x= x*0.0897;}
                    break;
                    case 5: switch (currency2) {
                         case 0: x= x*0.1344;
                         case 1: x= x*0.2062;
                         case 2: x= x*0.0936;
                         case 3: x= x*17.08;
                         case 4: x= x*1.762;
                         case 5: x= x;
                         case 6: x= x*4.69;
                         case 7: x= x*7.17;
                         case 8: x= x*0.219;
                         case 9: x= x*0.21;
                         case 10: x= x*0.1581;}
                    break;
                    case 6: switch (currency2) {
                         case 0: x= x*0.0287;
                         case 1: x= x*0.044;
                         case 2: x= x*0.0199;
                         case 3: x= x*3.64;
                         case 4: x= x*0.3757;
                         case 5: x= x*0.2132;
                         case 6: x= x;
                         case 7: x= x*1.53;
                         case 8: x= x*0.0467;
                         case 9: x= x*0.0449;
                         case 10: x= x*0.0337;}
                    break;
                    case 7: switch (currency2) {
                         case 0: x= x*0.0187;
                         case 1: x= x*0.0287;
                         case 2: x= x*0.013;
                         case 3: x= x*2.38;
                         case 4: x= x*0.2457;
                         case 5: x= x*0.1394;
                         case 6: x= x*0.654;
                         case 7: x= x;
                         case 8: x= x*0.031;
                         case 9: x= x*0.0293;
                         case 10: x= x*0.022;}
                    break;     
                    case 8: switch (currency2) {
                         case 0: x= x*0.61;
                         case 1: x= x*0.94;
                         case 2: x= x*0.427;
                         case 3: x= x*77.97;
                         case 4: x= x*8.04;
                         case 5: x= x*4.56;
                         case 6: x= x*21.41;
                         case 7: x= x*32.73;
                         case 8: x= x;
                         case 9: x= x*0.96;
                         case 10: x= x*0.72;}
                    break;                    
                    case 9: switch (currency2) {
                         case 0: x= x*0.64;
                         case 1: x= x*0.98;
                         case 2: x= x*0.44;
                         case 3: x= x*81.18;
                         case 4: x= x*8.37;
                         case 5: x= x*4.75;
                         case 6: x= x*22.29;
                         case 7: x= x*34.08;
                         case 8: x= x*1.04;
                         case 9: x= x;
                         case 10: x= x*0.75;}
                    break;          
                    case 10: switch (currency2) {
                         case 0: x= x*0.85;
                         case 1: x= x*1.3;
                         case 2: x= x*0.59;
                         case 3: x= x*108.03;
                         case 4: x= x*11.14;
                         case 5: x= x*6.32;
                         case 6: x= x*29.66;
                         case 7: x= x*45.35;
                         case 8: x= x*1.39;
                         case 9: x= x*1.33;
                         case 10: x= x;}
                    break;
                    return x;