(i)
int age=Integer.parseInt(jTextField2.getText());
if(age>=3 && age<=13)
{
jOptionPane1.showMessageDialog(this, "Welcome");
}
else
{
jOptionPane1.showMessageDialog(this, "Sorry!You are either underage or overage!!");
System.exit(0);
}
(ii)
int count=0;
if(jCheckBox1.isSelected())
count++;
if(jCheckBox2.isSelected())
count++;
if(jCheckBox3.isSelected())
count++;
if(jCheckBox4.isSelected())
count++;
if(jCheckBox5.isSelected())
count++;
if(jCheckBox6.isSelected())
count++;
jTextField3.setText(""+(count*1000));
(iii)
int fee=Integer.parseInt(jTextField3.getText());
int disc=0;
if(fee>1000)
disc=fee*20/100;
jTextField4.setText(""+(disc));
(iv)
int fee=Integer.parseInt(jTextField3.getText());
int disc=Integer.parseInt(jTextField4.getText());
jTextField5.setText(""+(fee-disc));