import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
/*
* Create a simple Graphical User Interface (GUI) Bank Balance application.
* The application must obtain the BankAccount balance from a user, and then
* display that balance within a JPanel when the user selects a button. The
* program should allow for the user to deposit and withdraw funds from their
* account using a simple interface. The remaining balance in the account
* should be displayed before exiting the program. Ensure that your application
* includes the following components:
* • JPanel
* • JButton
* • ActionListener
* Submit screenshots of your program’s execution and output. Include all appropriate
* source code in a zip file.
*
*
* Display: Balance
* Allow: Deposit / Withdrawl
*
* -----------Frame----------------------------------=
*
* Initial Balance :
* Transaction Amount : [WithDraw] [Deposit]
* Balance :
*
* Ledger:
* -------------------------------------------------
* + +
* + +
* + +
* + +
* -------------------------------------------------
* [Clear all] [Quit]
*/
public class BankAccount extends JFrame implements ActionListener
{
private JButton depositButton; // Buttons
private JButton withdrawlButton;
private JButton quitButton;
private JButton clearAllButton;
private boolean firstLoop;
private JFormattedTextField initBalanceField; // frame fields
private JFormattedTextField transAmountField;
private JFormattedTextField balanceField;
private JTextArea ledgerTape; // scroll pane
BankAccount() {
GridBagConstraints layoutConst = null;
JScrollPane scrollPane = null;
JLabel ledgerLabel = null; // labels
JLabel balanceLabel = null;
JLabel transAmountLabel = null;
JLabel initBalanceLabel = null;
NumberFormat currencyFormat = null;
setTitle("Bank Balance App");
initBalanceLabel = new JLabel("Inital Balance:"); // set up labels
transAmountLabel = new JLabel("Transaction:");
balanceLabel = new JLabel("Balance:");
ledgerLabel = new JLabel("Ledger:");
ledgerTape = new JTextArea(10,15); // set up ledger tape box
scrollPane = new JScrollPane(ledgerTape);
ledgerTape.setEditable(false);
depositButton = new JButton("Deposit"); // set up deposit button
depositButton.addActionListener(this);
withdrawlButton = new JButton("Withdrawl"); // set up Withdrawl button
withdrawlButton.addActionListener(this);
quitButton = new JButton("Quit"); // set up quit button
quitButton.addActionListener(this);
clearAllButton = new JButton("Clear all"); // setup clear all button
clearAllButton.addActionListener(this);
currencyFormat = NumberFormat.getCurrencyInstance();
initBalanceField = new JFormattedTextField(currencyFormat); // create initial balance field and specify currency format
initBalanceField.setEditable(true);
initBalanceField.setColumns(10);
initBalanceField.setValue(0);
transAmountField = new JFormattedTextField(currencyFormat); // create initial transamt field and specify currency format
transAmountField.setEditable(true);
transAmountField.setColumns(10);
transAmountField.setValue(0);
balanceField = new JFormattedTextField(currencyFormat); // create balance field and specify currency format
balanceField.setEditable(false);
balanceField.setColumns(10);
balanceField.setValue(0);
setLayout(new GridBagLayout()); // use a GridBagLayout
layoutConst = new GridBagConstraints(); // initBalance label Construction
layoutConst.insets = new Insets (10, 10, 5, 1);
layoutConst.anchor = GridBagConstraints.LINE_END;
layoutConst.gridx = 0;
layoutConst.gridy = 0;
add(initBalanceLabel, layoutConst);
layoutConst = new GridBagConstraints(); // initBalance field construction
layoutConst.insets = new Insets (10, 1, 5, 10);
layoutConst.fill = GridBagConstraints.HORIZONTAL;
layoutConst.gridx = 1;
layoutConst.gridy = 1;
add(initBalanceField, layoutConst);
layoutConst = new GridBagConstraints();
layoutConst.insets = new Insets (5, 10, 5, 1);
layoutConst.anchor = GridBagConstraints.LINE_END;
layoutConst.gridx = 0;
layoutConst.gridy = 1;
add(transAmountLabel, layoutConst);
layoutConst = new GridBagConstraints();
layoutConst.insets = new Insets (5, 1, 5, 10);
layoutConst.fill = GridBagConstraints.HORIZONTAL;
layoutConst.gridx = 1;
layoutConst.gridy = 1;
add(transAmountField, layoutConst);
layoutConst = new GridBagConstraints();
layoutConst.insets = new Insets (5,10,10,1);
layoutConst.anchor = GridBagConstraints.LINE_END;
layoutConst.gridx = 0;
layoutConst.gridy = 2;
add(balanceLabel, layoutConst);
layoutConst = new GridBagConstraints();
layoutConst.insets = new Insets (5, 1, 10, 10);
layoutConst.fill = GridBagConstraints.HORIZONTAL;
layoutConst.gridx = 1;
layoutConst.gridy = 2;
add(balanceField, layoutConst);
layoutConst = new GridBagConstraints(); // deposit bag construction
layoutConst.insets = new Insets (0, 5, 0, 10);
layoutConst.fill = GridBagConstraints.BOTH;
layoutConst.gridx = 2;
layoutConst.gridy = 2;
add(depositButton, layoutConst);
layoutConst = new GridBagConstraints(); // ledger label construction
layoutConst.insets = new Insets (10, 10, 1, 10);
layoutConst.fill = GridBagConstraints.HORIZONTAL;
layoutConst.gridx = 0;
layoutConst.gridy = 3;
add(ledgerLabel, layoutConst);
layoutConst = new GridBagConstraints();
layoutConst.insets = new Insets (1, 10, 10, 10);
layoutConst.fill = GridBagConstraints.HORIZONTAL;
layoutConst.gridx = 0;
layoutConst.gridy = 4;
layoutConst.gridwidth = 3;
add(scrollPane, layoutConst);
}
@Override
public void actionPerformed(ActionEvent event)
{
double initBalance;
double balance;
double transactionAmount;
transactionAmount = ((Number) transAmountField.getValue()).doubleValue();
ledgerTape.append("W/D - " + transactionAmount);
}
public static void main(String[] args)
{
BankAccount myFrame = new BankAccount();
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.pack();
myFrame.setVisible(true);
}
}
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OneCompiler supports Gradle for dependency management. Users can add dependencies in the build.gradle file and use them in their programs. When you add the dependencies for the first time, the first run might be a little slow as we download the dependencies, but the subsequent runs will be faster. Following sample Gradle configuration shows how to add dependencies
apply plugin:'application'
mainClassName = 'HelloWorld'
run { standardInput = System.in }
sourceSets { main { java { srcDir './' } } }
repositories {
jcenter()
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dependencies {
// add dependencies here as below
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Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world's number one server programming language with a 12 million developer community, 5 million students studying worldwide and it's #1 choice for the cloud development.
short x = 999; // -32768 to 32767
int x = 99999; // -2147483648 to 2147483647
long x = 99999999999L; // -9223372036854775808 to 9223372036854775807
float x = 1.2;
double x = 99.99d;
byte x = 99; // -128 to 127
char x = 'A';
boolean x = true;
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
// code
} else {
// code
}
Example:
int i = 10;
if(i % 2 == 0) {
System.out.println("i is even number");
} else {
System.out.println("i is odd number");
}
Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.
switch(<conditional-expression>) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
//code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(<condition>){
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (<condition>);
Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.
class keyword is required to create a class.
class Mobile {
public: // access specifier which specifies that accessibility of class members
string name; // string variable (attribute)
int price; // int variable (attribute)
};
Mobile m1 = new Mobile();
public class Greeting {
static void hello() {
System.out.println("Hello.. Happy learning!");
}
public static void main(String[] args) {
hello();
}
}
Collection is a group of objects which can be represented as a single unit. Collections are introduced to bring a unified common interface to all the objects.
Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:
This framework also defines map interfaces and several classes in addition to Collections.
| Collection | Description |
|---|---|
| Set | Set is a collection of elements which can not contain duplicate values. Set is implemented in HashSets, LinkedHashSets, TreeSet etc |
| List | List is a ordered collection of elements which can have duplicates. Lists are classified into ArrayList, LinkedList, Vectors |
| Queue | FIFO approach, while instantiating Queue interface you can either choose LinkedList or PriorityQueue. |
| Deque | Deque(Double Ended Queue) is used to add or remove elements from both the ends of the Queue(both head and tail) |
| Map | Map contains key-values pairs which don't have any duplicates. Map is implemented in HashMap, TreeMap etc. |