Java ArrayList handling Employee details like adding, listing and searching using Swing widget

An ArrayList in Java is a dynamic and resizable array declared in java.util package. Unlike standard array whose size is fixed, the ArrayList contents can dynamically grow and shrink. Following is a simple example which illustrates a menu driven program defining Arraylist methods using Swing GUI widget.

Swing is a lightweight GUI widget toolkit for Java and also used for building optimized window based applications, it provides a range of components like(JButton, JTextField, JTextArea, JFrame etc).

Below is a simple program having Employee object and handling it using ArrayList with Swing GUI toolkit with operations like .

 

basic add operation

list all operation

search operation

import java.util.ArrayList;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextArea;

import javax.swing.JTextField;

class Employee {

long id;

String name;

double basic;

public Employee(long id, String name, double basic) {

super();

this.id = id;

this.name = name;

this.basic = basic;

}

public long getId() {

return id;

}

public void setId(long id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getBasic() {

return basic;

}

public void setBasic(double basic) {

this.basic = basic;

}

}

public class EmployeeHandlerSwing extends JFrame {

private ArrayList<Employee> empList = new ArrayList<Employee>();

JLabel idLabel;

JTextField idField;

JLabel nameLabel;

JTextField nameField;

JLabel basicSalaryLabel;

JTextField basicSalaryField;

JButton addButton;

JButton listAllButton;

JTextArea ta;

JButton searchButton;

JTextField searchTextField;

public EmployeeHandlerSwing() {

setBounds(300, 90, 350, 600);

setLayout(null);

idLabel = new JLabel("ID");

idLabel.setBounds(80, 60, 70, 40);

add(idLabel);

idField = new JTextField("");

idField.setBounds(140, 60, 100, 30);

add(idField);

nameLabel = new JLabel("Name");

nameLabel.setBounds(80, 95, 70, 40);

add(nameLabel);

nameField = new JTextField("");

nameField.setBounds(140, 100, 100, 30);

add(nameField);

basicSalaryLabel = new JLabel("Basic");

basicSalaryLabel.setBounds(80, 130, 70, 40);

add(basicSalaryLabel);

basicSalaryField = new JTextField("");

basicSalaryField.setBounds(140, 140, 100, 30);

add(basicSalaryField);

addButton = new JButton("Add");

addButton.setBounds(80, 190, 70, 40);

add(addButton);

listAllButton = new JButton("List All");

listAllButton.setBounds(190, 190, 100, 40);

add(listAllButton);

ta = new JTextArea();

ta.setBounds(80, 250, 200, 170);

add(ta);

searchButton = new JButton("Search");

searchButton.setBounds(80, 460, 100, 40);

add(searchButton);

searchTextField = new JTextField("");

searchTextField.setBounds(190, 460, 100, 40);

add(searchTextField);

addButton.addActionListener(e -> {

Long id = Long.parseLong(idField.getText());

String name = nameField.getText();

double basicSal = Double.parseDouble(basicSalaryField.getText());

    

    System.out.println("Adding: " + id + " - " + name + " - " + basicSal);

    

    Employee emp = new Employee(id, name, basicSal);

    empList.add(emp);

    

    ta.setText(emp.getId() + " " + emp.getName() + " " + emp.getBasic());

});

listAllButton.addActionListener(e -> {

ta.setText("");

empList.forEach(emp -> {

ta.append(emp.getId() + " " + emp.getName() + " " + emp.getBasic() + System.getProperty("line.separator"));

});

});

searchButton.addActionListener(e -> {

ta.setText("");

long searchId = Long.parseLong(searchTextField.getText());

empList.forEach(emp -> {

if(emp.getId() == searchId) {

ta.append(emp.getId() + " " + emp.getName() + " " + emp.getBasic());

}

});

});

setVisible(true);

}

public static void main(String[] args) {

new EmployeeHandlerSwing();

}

}