1 | Page Java Practicals [email protected]Create a GUI Form to do the following: 1. Create a GUI to perform addition, multiplication, subtraction an d division of two numbers u sing four d ifferent buttons for each operation and a single text box to display the result. private void btnAActionPerformed(java.awt.event.ActionEvent evt) { double n1,n2,res; String s1=t1.getText(); String s2=t2.getText(); n1=Double.parseDouble(s1); n2=Double.parseDouble(s2); res=n1+n2; t3.setText(res+""); } private void btnSActionPerformed(java.awt.event.ActionEvent evt) { double n1,n2,res; String s1=t1.getText(); String s2=t2.getText(); n1=Double.parseDouble(s1); n2=Double.parseDouble(s2); res=n1-n2; t3.setText(res+""); } private void btnMActionPerformed(java.awt.event.ActionEvent evt) { double n1,n2,res; String s1=t1.getText(); String s2=t2.getText(); n1=Double.parseDouble(s1); n2=Double.parseDouble(s2); res=n1*n2; t3.setText(res+""); } private void btnDActionPerformed(java.awt.event.ActionEvent evt) { double n1,n2,res; String s1=t1.getText(); String s2=t2.getText(); n1=Double.parseDouble(s1); n2=Double.parseDouble(s2); res=n1/n2; t3.setText(res+""); } private void btn0ActionPerformed(java.awt.event.ActionEvent evt) { DecimalFormat d=new DecimalFormat("#0"); double r=Double.parseDouble(t3.get Text()); t3.setText(d.format(r)); } private void btn2ActionPerformed(java.awt.event.ActionEvent evt) { DecimalFormat d=new DecimalFormat("#0.00"); double r=Double.parseDouble(t3.get Text()); t3.setText(d.format(r)); } 2. Create a GUI to perform addition, multiplication, subtraction an d division of two numbers using a single butto n and four different text boxes to store the respective results. private void btnCalcActionPerformed(java.awt.event.ActionEvent evt) { double n1,n2; double add,sub,pro,div; n1=Double.parseDouble(t1.getText()); n2=Double.parseDouble(t2.getText()); add=n1+n2; sub=n1-n2;
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Create a GUI Form to do the following:
1. Create a GUI to perform addition, multiplication, subtraction and division of two numbers using four different buttonsfor each operation and a single text box to display the result.
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3. Create a GUI form to find simple interest. Enter Principal amount, Rate of Interest and time in three different text boxesand calculate and display interest amount in a text box.
8. Enter your name, class, section, address, phone number, city, state and pin in different text fields and display all thesedifferent values in a textarea control.
10. Enter a name and create two buttons to convert that to “Uppercase” and “Lowercase”. Also create a button that willdisplay the “Length” of the name you entered in a message box.
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11. Enter a number and reverse the sign of that number i.e. if the number is positive change it to negative and it it is anegative than change it to positive.
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17. Enter a number and check (Create 5 different BUTTONS to do the following)a. if it is an even number or an odd number.b. if it is a prime number or not.c. if it is a positive, negative or zero.d. if it is divisible by 5 or not.e. if it is an Armstrong number or not.
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18. Enter a number in a texbox and on clicking a button that number will be appended to a textarea control and text box willbe blank. Another Button will show an Input Box and on clicking its OK button the number will be appended to the sametextarea control.
private void btnAppendInputBoxActionPerformed(java.awt.event.ActionEvent evt) {String s=JOptionPane.showInputDialog(this,"Enter a Number");double n=Double.parseDouble(s);ta.append(n+"\n");
}
19. Input two strings in two text boxes (Create 7 different BUTTONS to do the following)a. and concat them and display theconcated string in a third text box.
b. and print whether they are same:Ignoring case Case sensitiveusing equals(), equalsIgnoreCase()and compareTo() methods.
c. Print a character at position ‘n’ of first string
d. Reverse the first String usingStringBuilder Class.
private void btnTableX10ActionPerformed(java.awt.event.ActionEvent evt) {String s=JOptionPane.showInputDialog(this,"Table of which Number??");long n=Long.parseLong(s);
21. Using while Loop, enter a number in a textfield and : (Create 15 different BUTTONS to do the following)a. Display total digits it containb. Display sum of its individual
digits.c. Reverse that number.d. Display maximum digit.e. Display minimum digit.f. Display second maximum digit.
g. Display total number of evenand odd digits.
h. Display sum of its even digits.i. Display sum of its odd digits.
j. Display sum of cube of itsindividual digits.
k. Display sum of square of itsindividual digits.
l. Increase each digit of thenumber by 1 and display it as anew number.
m. Display ‘n’ Fibonacci numbersin a textarea.
n. Display Prime numbers upto ‘n’. o. Display ‘n’ Prime Numbers.
22. Input a string and : (Create 3 different BUTTONS to do the following)a. Count total vowels in it. It should also display the count of all the individual vowels. Make use of a method namely
‘isVowel‟ to check if the character is a vowel or not.b. Reverse that string without using StringBuffer or StringBuilder class. Also check if the string is a ‘Palindrome’ or ‘Not a
Palindrome’.
private void btnCountVowelActionPerformed(java.awt.event.ActionEvent evt) {String s;int c=0;int a=0;int e=0;int i=0; int o=0; int u=0;char ch;
23. Enter a starting value and an end value in two text boxes and (Create 6 different BUTTONS to do the following)a. Print a series between those two numbers and their sumb. Print all the even numbers between them as well as the sum of those even numbersc. Print all the odd numbers between them as well as their sum.d. Print all the prime numbers between them as well as their sum.
e. Print a Fibonacci series between them and their sum.f. Interchange or swap values of both the textfield.
In all the above cases the result should be displayed in a textarea control.
25. Create a Panel control on the form and add three radio buttons namely „Male‟, „Female‟ and „Kid‟ in it. Perform action soas to make only one radio button selectable in that panel. Now, display which radio button has been selected in amessage box by:
a. Creating a buttonb. By creating a common code for the ‘actionPerformed’ event of those three radio buttons and name the method as
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26. Create a combo box and add „Jaipur‟, „Kota‟, „Ajmer‟ and „Udaipur‟ in it. Now, display the selected value and its indexposition in a message box by:
a. Creating a buttonb. By creating a common code for the ‘actionPerformed’ event of that combo box and name the method as ‘CityName’
JOptionPane.showMessageDialog(this,"City: "+ city+ " Position: "+ p + " : Using Common Code");}
27. Input a year and display if it is a leap year or not.28. Write a program which on clicking a button will keep on asking for a number in an Input box until user enters -999 and
then will display the sum and count of those numbers in a message box.
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30. Enter a name using Input Box. Now add that name in a textarea control ONLY if users click YES button in a Confirm Box.On Adding that name in a textarea control a message „Success‟ will appear in a Message Box. The program will keep onprompting for a name using Input Box till user does not enter a Blank value in that box.
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32. Create a calculator using four radio buttons that will perform all the four basic mathematical operations. Write acommon code for all the four radio button‟s „actionPerformed‟ event.
}catch(Exception e) {JOptionPane.showMessageDialog(this,"Please Enter a non-zero value for second number");t2.requestFocus();return;
}
t3.setText(""+d.format(res)); }
33. Create a calculator using a „List Box‟. Four mathematical operations will be displayed in a list box and on clicking anoption in a list box, the result will be displayed in a text field. Make use of its „getSelectedValue()‟ method.
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35. Design the following Java Form to calculate net payment to be made by a customer.
There are four mode of payments : Cash,Credit Card, Debit Card and Cheque in a combo box.
The modes Credit Cards, Debit Cards and Cheque is not applicable for kids. And so se lecting these modes should disable ‘Kid’customer type.
Ensure that ONLY numeric values are entered in ‘tPr’ and ‘tQty’ text fields.
No editing should be allowed in gross, discount amount, additional discount and net text fields.
When the form starts, ‘Male’ radio button should be selected as the customer type.
NOTE: The following discount is given for the gross amount greater than 1000 rs. Any bill less than 1000 Rs will not get anydiscount.
CUSTOMERTYPE
PAYMENT MODE DISCOUNT %
MALE CASH 2
CREDIT CARD 5
DEBIT CARD 10
CHEQUE NIL
FEMALE CASH 3
CREDIT CARD 7DEBIT CARD 12
CHEQUE NIL
KID CASH 5
CREDIT CARD NOT APPL
DEBIT CARD NOT APPL
CHEQUE NOT APPL
The customer gets additional discount of 2% if he/she is a member of the Mall.
To make ‘Male’ radio button selected when the form starts, type the following code just below the ‘initComponents()’ code asshown below:
initComponents();rbM.setSelected(true);
Now to ensure that ONLY numeric values are entered in ‘Price’ and ‘Quantity’ text fields do the following: o To write a common „KeyTyped‟ event code for these two text fields.o Select these two text boxes:
From the shortcut menu, select ‘Properties’. In that dialog box, click on the ‘Events’ tab. Now click on the ellipsis (…) button in front of ‘keyTyped’ option. In the ‘Handler’ dialog box, click on ‘Add’ button. Type a name for the ‘Handler’ say ‘numbers’ and click OK button. Now click on the drop down box in front of ‘KeyTyped’ method and select the handler name you have just
created i.e. ‘numbers’ in our case. Now open the ‘source’ window and there you will see the ‘numbers’ method and then type the following piece
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Now to disable ‘Kid’ radio button when payment mode is ‘Credit Card’, ‘Debit Card’ and ‘Cheque’, write the following code forthat combo box’s Action Performed event:
// to get the selected string from the combo boxString modename=cmbPayment.getSelectedItem()+"";
//or you can even get the index position of the selected mode
int modeposition=cmbPayment.getSelectedIndex();
// if customer is Maleif(rbM.isSelected()){
if(gross>1000){ // here modename is used for comparisonif(modename.equalsIgnoreCase("cash")){ disc=gross*2/100 ; }if(modename.equalsIgnoreCase("credit card")) { disc=gross*5/100; }if(modename.equalsIgnoreCase("debit card")) { disc=gross*10/100; }
}// end gross}//end male
//if customer is Femaleif(rbF.isSelected()){
if(gross>1000){ // here modeposition is used for comparisonif(modeposition==0){ disc=gross*3/100; }if(modeposition==1){ disc=gross*7/100; }if(modeposition==2){ disc=gross*12/100;}
}//end gross}//end female
//if customer is a Kidif(rbK.isSelected()){
if(gross>1000){ // here modeposition is used for comparisonif(modeposition==0) { disc=gross*5/100; }
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36. Create a form as shown below:
It contains 2 panels namely ‘panPer’ and ‘panTemp’. When the form loads both these panels are not visible. On clicking ‘Permanent’ radio button, ‘panPer’ get visible and other one invisible. On clicking ‘Temporary’ radio button, ‘panTemp’ get visible and other one invisible.
The criterion for calculation is as given below :For Temporary Employee Salary is Rs. 250 per day.
OverTime is Rs. 50 per overtime hour
For Permanent Employee HRA is 10% of Basic SalaryCCA is Rs. 500
OverTime allowance is Rs. 75 per overtime hour.
Total Amount is the sum total of Salary Amount (TxtSalary) and OverTimeAmount (TxtOverTime).
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