Java Swing Project | Create text converter tool for word count , character count , convert text into UPPERCASE or lowercase etc with validations.

In this article we will create text converter tool in java swing project that can be usd to count words and characters , convert text into UPPERCASE or lowercase , remove extra spaces in your paragraph etc will help.

For that we will use some java swing components , Listener Interface , Event , Methods Etc..

1.    setText() : Defines the single line of text this component will display. If the value of text is null or empty string, nothing is displayed.
2.     getText() : returns the text from the single-line text field.
3.     setFont() : sets the font and style when displaying text strings.
4.     setToolTipText() : sets the tooltip of the component to the specified string s. Use : When the cursor enters the boundary of that component a popup appears and text is displayed.
5.     setBounds(): set the position and size of any component.
6.     add() : add a component on another component or JFrame.
7.     setCursor() : sets a mouse cursor shape like hand pointer,Text Pointer,Help Pointer Etc. The hand cursor is mostly used.
8.     setEditable() : TextField are editable by default. The code setEditable(false) makes the TextField uneditable. It is still selectable and the user can copy data from it, but the user cannot change the TextField's contents directly. The code setEnabled(false), disables this TextField.
9.     setLocation(): Sets the location of the point to the specified location.
10.     setLayout() : sets the layout manager for the component.
11.     setResizable(): Indicates whether this frame is resizable by the user. By default, all frames are initially resizable. return : true if the user can resize this frame; false otherwise.
12.      setVisible() : sets the visibility of the component or JFrame. It is by default false.
13.     setFocusable() : Sets the focusable state of this Component to the specified value. This value overrides the Component's default focusability.
14.      setDefaultCloseOperation() : setDefaultCloseOperation() - Exit the application. The default behavior is to simply hide the JFrame when the user closes the window. When we use setDefaultCloseOperation() it that time we will exit the JFrame form.
15.     addActionListener Iterface and ActionEvent method : Generated when button is pressed , menu-item is selected , list-item is double clicked.
16.     addKeyListener Iterface and keyEvent method : Generated when input is received from keyword.
17.      setColumns() : set the number of columns of this textArea.
18.      setViewportView() : Creates a viewport if necessary and then sets its view. Applications that don't provide the view directly to the JScrollPane constructor should use this method to specify the scrollable child that's going to be displayed in the scrollpane. For example:
         JScrollPane scrollpane = new JScrollPane();
        scrollpane.setViewportView(JTextArea1);

Example :

package com.company;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class textConverter extends JFrame {
    //JFrame components declarations start here  :
    JLabel counterLabel = new JLabel();
    JLabel mainHeading = new JLabel();
    JScrollPane jScrollPane1 = new JScrollPane();
    JTextArea previewTextBox = new JTextArea();
    JButton uppercaseBtn = new JButton();
    JLabel previewTextLabel = new JLabel();
    JButton lowercaseBtn = new JButton();
    JButton copyBtn = new JButton();
    JScrollPane jScrollPane2 = new JScrollPane();
    JTextArea mainTextbox = new JTextArea();
    JLabel mainTextBoxLabel = new JLabel();
    JButton removeSpaecBtn = new JButton();
    JButton clearBtn = new JButton();
    JButton cutBtn = new JButton();
    JButton pasteBtn = new JButton();

    //Create a constructor
    textConverter(){

        counterLabel.setFont(new Font("Tahoma", 1, 18));
        add(counterLabel);
        counterLabel.setText("Words : 0 , Character : 0 , Spaces : 0");
        counterLabel.setBounds(320, 280, 400, 30);

        mainHeading.setFont(new Font("Tahoma", 1, 18));
        mainHeading.setText("TEXT CONVERTER :");
        add(mainHeading);
        mainHeading.setBounds(340, 20, 200, 30);

        previewTextBox.setEditable(false);
        previewTextBox.setColumns(20);
        previewTextBox.setRows(5);
        previewTextBox.setToolTipText("Preview Text Here");
        previewTextBox.setFont(new Font("Tahoma", 1, 18));
        jScrollPane1.setViewportView(previewTextBox);

        add(jScrollPane1);
        jScrollPane1.setBounds(20, 340, 850, 190);

        uppercaseBtn.setFont(new Font("Tahoma", 1, 14));
        uppercaseBtn.setText("UPPERCASE");
        uppercaseBtn.setToolTipText("UPPERCASE");
        add(uppercaseBtn);
        uppercaseBtn.setBounds(50, 540, 120, 40);
        uppercaseBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        previewTextLabel.setFont(new Font("Tahoma", 1, 18));
        previewTextLabel.setText("Preview Text Here :");
        add(previewTextLabel);
        previewTextLabel.setBounds(30, 310, 220, 30);

        lowercaseBtn.setFont(new Font("Tahoma", 1, 14));
        lowercaseBtn.setText("lower case");
        lowercaseBtn.setToolTipText("lower case");
        add(lowercaseBtn);
        lowercaseBtn.setBounds(180, 540, 120, 40);
        lowercaseBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        copyBtn.setFont(new Font("Tahoma", 1, 14));
        copyBtn.setText("Copy");
        copyBtn.setToolTipText("Copy");
        add(copyBtn);
        copyBtn.setBounds(310, 540, 90, 40);
        copyBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        pasteBtn.setFont(new Font("Tahoma", 1, 14));
        pasteBtn.setText("Paste");
        pasteBtn.setToolTipText("Paste");
        add(pasteBtn);
        pasteBtn.setBounds(410, 540, 90, 40);
        pasteBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        mainTextbox.setColumns(20);
        mainTextbox.setRows(5);
        mainTextbox.setToolTipText("Enter Your Text Here");
        mainTextbox.setFont(new Font("Tahoma", 1, 18));
        jScrollPane2.setViewportView(mainTextbox);

        add(jScrollPane2);
        jScrollPane2.setBounds(20, 90, 850, 190);

        mainTextBoxLabel.setFont(new Font("Tahoma", 1, 18));
        mainTextBoxLabel.setText("Enter Your Text Here :");
        add(mainTextBoxLabel);
        mainTextBoxLabel.setBounds(20, 60, 220, 30);

        removeSpaecBtn.setFont(new Font("Tahoma", 1, 14));
        removeSpaecBtn.setText("Remove Space");
        removeSpaecBtn.setToolTipText("Remove Extra Spaces");
        add(removeSpaecBtn);
        removeSpaecBtn.setBounds(590, 540, 160, 40);
        removeSpaecBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        clearBtn.setFont(new Font("Tahoma", 1, 14));
        clearBtn.setText("Clear");
        clearBtn.setToolTipText("Clear all text");
        add(clearBtn);
        clearBtn.setBounds(760, 540, 73, 40);
        clearBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        cutBtn.setFont(new Font("Tahoma", 1, 14));
        cutBtn.setText("Cut");
        cutBtn.setToolTipText("Cut");
        add(cutBtn);
        cutBtn.setBounds(510, 540, 70, 40);
        cutBtn.setCursor(new Cursor(Cursor.HAND_CURSOR));

        setTitle("TEXT CONVERTER");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setFont(new Font("Tahoma", 1, 14));
        setLocation(new Point(400, 100));
        setResizable(false);
        setSize(900, 650);
        setLayout(null);
        setVisible(true);

        //Button AddEventListener start here :

        //1.Create uppercase button
        uppercaseBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    String str = mainTextbox.getText().toUpperCase();
                    previewTextBox.setText(str);
                }
            }
        });
        //2.Create lowercase button
        lowercaseBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    String str = mainTextbox.getText().toLowerCase();
                    previewTextBox.setText(str);
                }
            }
        });
        //3.word count , character count and white spaces
        mainTextbox.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e) {
                String str = mainTextbox.getText();
                previewTextBox.setText(str);
                //Count number of character are there :
                int TotalChar = str.length();
                int numSpaces=0;
                int numWords=0;

                //Count number of spaces are there :
                    for (char c : mainTextbox.getText().toCharArray()){
                        if(c ==' '){
                            numSpaces++;
                        }
                    }
                //Count number of words are there :
                    for (String s : mainTextbox.getText().split("\\s+")){
                        numWords++;
                        if(mainTextbox.getText().length()<1){
                            numWords=0;
                        }
                    }

                counterLabel.setText("Words : "+numWords+" , Character : "+ TotalChar +" , Spaces : "+numSpaces +"");
            }
        });
        //4.Create copy button
        copyBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    previewTextBox.selectAll();
                    previewTextBox.copy();
                }
            }
        });
        //4.Create cut button
        cutBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                  if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    previewTextBox.selectAll();
                    previewTextBox.setEditable(true);
                    previewTextBox.cut();
                    previewTextBox.setEditable(false);
                  }
            }
        });
        //5.Create clear button
        clearBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                  if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    previewTextBox.setText("");
                    mainTextbox.setText("");
                    counterLabel.setText("Words : 0 , Character : 0 , Spaces : 0");
                }
            }
        });
        //6.Create remove extra white spaces button
        removeSpaecBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    String str = mainTextbox.getText().replaceAll("\\s+"," ");
                    mainTextbox.setText(str);
                    previewTextBox.setText(str);
                }
            }
        });
        //
        pasteBtn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if(mainTextbox.getText().length()==0){
                    mainTextbox.requestFocus();
                    JOptionPane.showMessageDialog(null,"Please Enter Text In TextBox...","Error",JOptionPane.ERROR_MESSAGE);
                }else{
                    mainTextbox.paste();
                }
            }
        });
    }
    //main method start here
    public static void main(String[] args) {
        new textConverter();
    }
}

Output: