Question

Using java, commenting should be proper, along with testing for valid and invalid inputs:

1. Develop a simple tool for analyzing a segment of text that determines the number of words in that segment and the average word length. The application should have a single window with a scrolling text box (JTextArea) and an area to display the statistics. The statistics area should be a panel with a titled border, containing labelled fields that display the number of words in the text and the average word length, as well as any other statistics you would like to add. The statistics area should also contain a button that, when pressed, computes the statistics for the current text content.

   Hint: Use a Scanner object to parse the text content. The .next() operation will get the next word.

• Design and implement an application that works as a stopwatch. Include a display that shows the time as it increments. The time value should be seconds only, to one decimal place. Include buttons that allow the user to start and stop the time, and to reset the display to zero. Arrange the components to present a nice user interface. The buttons should include a mnemonic shortcut. Only a single action listener should be used for the buttons.

Answer 1

TextStatistics.java

import java.awt.Color;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class TextStatistics extends JFrame implements ActionListener {

   private static final long serialVersionUID = 1L;
   // declare controls
   private JTextArea textArea;
   private JPanel panel;
   private JLabel label1,label2,label3;
   private JTextField words,average;
   private JButton calculate,clear;
  
   public TextStatistics() throws HeadlessException {
       setTitle("Text Statistics Tool"); // set title of frame
       setSize(420, 500); // set size of the frame
       setLayout(null); // set layout as null
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       // instantiate all declared controls
       textArea=new JTextArea();
       label1=new JLabel("Enter text here:");
       label2=new JLabel("Number of words:");
       label3=new JLabel("Avg length of words:");
       words=new JTextField();
       average=new JTextField();
       calculate=new JButton("Calculate");
       clear=new JButton("Clear");
       // setting bounds to the controls
       label1.setBounds(150,35,200,30);
       label2.setBounds(30,40,150,30);
       label3.setBounds(30,80,150,30);
       words.setBounds(150,40,100,30);
       average.setBounds(150,80,100,30);
       calculate.setBounds(30,120,100,30);
       clear.setBounds(150,120,100,30);
       textArea.setBounds(50,65,300,120);
       // add text area and label into frame
       add(textArea);
       add(label1);
       // create panel
       panel=new JPanel();
       panel.setLayout(null);
       // add controls into the panel
       panel.add(label2);
       panel.add(label3);
       panel.add(words);
       panel.add(average);
       panel.add(calculate);
       panel.add(clear);
       // set border as titled border to panel
       panel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.BLACK), "Statistics"));
       panel.setToolTipText("Statistic");
       panel.setBounds(50,200,300,180);
       add(panel); // add panel into the frame
       // adding action listener to the buttons
       calculate.addActionListener(this);
       clear.addActionListener(this);
       setVisible(true); // making frame visible
   }
   @Override
   public void actionPerformed(ActionEvent e) {
       // if clear button is clicked
       if(e.getSource()==clear) {
           // clear text area and both text fields
           textArea.setText("");
           words.setText("");
           average.setText("");
       }else
           // if calculate button is clicked
           if(e.getSource()==calculate) {
               String text=textArea.getText(); // get text from text area
               ArrayList<String> list=new ArrayList<>(); // create 1 array list
               // add all words to array list
               for(String word:text.split(" "))
                   list.add(word);
               words.setText(list.size()+""); // display words count
               int averageCount=0;
               // calculate average count letters in all words
               for(String word:list)
                   averageCount+=word.length();
               average.setText(averageCount/list.size()+""); // display average letters count
           }
   }
  
   public static void main(String[] args) {
       new TextStatistics(); // anonymous object of TextStatistics class
   }

}

Output

Note--> At the time of entering text into text area don't use enter button.