Question

6 (10 points Remember the recursive Searching algorithm Binary Search. Write a recursive method to search for a target character in the array and return the index location if found or -1 if it is not found. 7 a5 points 17 points cach) Write the code to create a GUI based class Temperature Converter which inherits from JFrame and implements the ActionListerner interface. public static int binary Search(char target, char( theValues, int firstIndex, int lastindex) Example: Clicked "F to C" button Example: Clicked C to F* button .. . . Temperature Converter 82.0 F - 27.78 Temperature Converter 32.0C-89.60 F FtoC COF Ftoc CtOF a. Create the constructor so that the JButtons have listeners attached, and all components are added to the appropriate JPanel. b. Create the getDoubleFromTextField method that takes in a JTextField and returns the value it contained as a double it should handle exceptions appropriately within the method. public double getDouble From TextField(JTextField jtf) throws Exception {

Answer 1

Code:

6)

Binary.java X Temparature Converter.java x public class Binary{ public static int binarySearch(char target,char[] theValues,int firstIndex,int lastIndex) { ! if (lastIndex>=firstIndex) { int mid = firstIndex+(lastIndex-firstIndex)/2; // Finding mid value. if (theValues[mid] == target){ // Comparing array[mid] value and target return mid; else if(theValues (mid] > target) { lastIndex = mid -1; IT Updating lastIndex return (binarySearch(target, theValues, firstIndex, lastIndex)); // Recursive call. else if (theValues[mid] < target) { firstIndex = mid + 1; 77 Updating firstIndex return (binarySearch(target, theValues, firstIndex, lastIndex)); // Recursive call. return -1; public static void main(String[] args) { // Declaring variables. char thevalues [] = {'a','b', 'c','d', 'e','f','g','h', 'i'}; int firstIndex = 0; int lastIndex = theValues.length; char target = 'g';/T target character, int result = binarySearch(target, theValues, firstIndex, lastIndex); // Calling function. if (result<0){ System.out.println("The target is not present in the values array."); // If the target is not present in array. else{ System.out.println("The target is present at index: " + result ); // If the target is present in array. 32 } 33 }

Output:

söm3_7hing@ditt:-/Documents/Chegg/Dec/95$ javac Binary.java, som3_7hing@diff:-/Documents/Chegg/Dec/95$ java Binary The target is present at index: 6 som3_7hing@diff:-/Documents/Chegg/Dec/95$

7)

1 3 6 TemparatureConverter.java X Binary.java // Importing required packages import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; public class TemparatureConverter extends JFrame implements ActionListener{ JLabel label; JButton buttoni,button2; JTextField tl; TemparatureConverter() { this.setTitle("Temparature Converter"); // titile for frame JPanel panel = new JPanel(); // Creating JPanel panel.setLayout(null); label = new JLabel(""); // Initially the JLable value in empty. label.setBounds (79,20,280,30); ti = new JTextField(); // Creating TextField ti.setBounds (10,80,280,35); // Setting position and heigth and width of a TextField. button1 = new JButton("F to C"); // Setting button with Text "F to cu button1.setBounds (50,130,90, 32); button1.setBackground (Color.white); // Setting background color to button1 button1.addActionListener(this); IT Adding ActionListener to buttoni, button2 = new JButton("Cto F"); // Setting button with Text "C to F" button2.setBounds (170,130,90, 32); button2.setBackground (Color.white); // Setting background color to button1 button2.addActionListener(this); IT Adding ActionListener to button1 // Adding all components to panel panel.add(label); panel.add(ti); panel.add(buttonl); panel.add(button2); // Adding panel to frame. add(panel); setSize(300, 200); // Setting size of the frame. setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT ON CLOSE) ; setVisible(true);

public double getDoubleFromTextField(JTextField tf) throws Exception{ double value; try{ value = Double.parseDouble(tf.getText(); // Converting String to Double 40 catch (Exception e) { value = 0.0; // If an exception is raised. 46 return value; // Returning value. public void actionPerformed(ActionEvent e) { try{ double value = getDoubleFromTextField(t1); // Calling function, if(e.getSource()==buttonl) { double c = (5f/9) * (value - 32); // converting f to G label.setText(String.format("%.1f F = %.2f (", value,c)); // setting label text with the given format. else if(e.getSource() ==button2){ double f = value *(9f/5) + 32; // Converting c to fi label.setText(String.format("%.2f C = %.2f F",value, f)); // Setting label text with the given format. catch (Exception el){ 62 65 public static void main(String[] args) { new TemparatureConverter(); 66 67 }

Output:

som3 7hing@diff:-/Documents/Chegg/Dec/95$ javac TemparatureConverter.java, s0m3 7hing@diff:-/Documents/Chegg/Dec/95$ java TemparatureConverter Temparature Converter 82.0 F = 27.78 C Fto C Cto F

s0m3 7hing@diff:-/Documents/Chegg/Dec/95$ javac TemparatureConverter.java S0m3_7hing@diff:-/Documents/Chegg/Dec/95$ java TemparatureConverter Temparature Converter 32.0 C = 89.60 F Ftoc ctOF

Raw Code:

6)

public class Binary{
   public static int binarySearch(char target,char[] theValues,int firstIndex,int lastIndex){
       if (lastIndex>=firstIndex){
           int mid = firstIndex+(lastIndex-firstIndex)/2; // Finding mid value.
           if (theValues[mid] == target){ // Comparing array[mid] value and target
               return mid;
           }
           else if(theValues[mid] > target){
               lastIndex = mid -1; // Updating lastIndex
               return (binarySearch(target,theValues,firstIndex,lastIndex)); // Recursive call.
           }
           else if (theValues[mid] < target){
               firstIndex = mid + 1; // Updating firstIndex
               return (binarySearch(target,theValues,firstIndex,lastIndex)); // Recursive call.
           }
       }
       return -1;
   }
   public static void main(String[] args) {
       // Declaring variables.
       char theValues []= {'a','b','c','d','e','f','g','h','i'};
       int firstIndex = 0;
       int lastIndex = theValues.length;
       char target = 'g'; // target character.
       int result = binarySearch(target,theValues,firstIndex,lastIndex); // Calling function.
       if (result<0){
           System.out.println("The target is not present in the values array."); // If the target is not present in array.
       }
       else{
           System.out.println("The target is present at index: " + result ); // If the target is present in array.
       }
   }
}

7)

// Importing required packages
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class TemparatureConverter extends JFrame implements ActionListener{
JLabel label;
JButton button1,button2;
JTextField t1;
TemparatureConverter(){
this.setTitle("Temparature Converter"); // titile for frame
JPanel panel = new JPanel(); // Creating JPanel
panel.setLayout(null);
label = new JLabel(""); // Initially the JLable value in empty.
label.setBounds(70,20,280,30);
t1 = new JTextField(); // Creating TextField
t1.setBounds(10,80,280,35); // Setting position and heigth and width of a TextField.
button1 = new JButton("F to C"); // Setting button with Text "F to C"
button1.setBounds(50,130,90,32);
button1.setBackground(Color.white); // Setting background color to button1
button1.addActionListener(this); // Adding ActionListener to button1
button2 = new JButton("C to F"); // Setting button with Text "C to F"
button2.setBounds(170,130,90,32);
button2.setBackground(Color.white); // Setting background color to button1
button2.addActionListener(this); // Adding ActionListener to button1
// Adding all components to panel
panel.add(label);
panel.add(t1);
panel.add(button1);
panel.add(button2);
// Adding panel to frame.
add(panel);
setSize(300, 200); // Setting size of the frame.
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public double getDoubleFromTextField(JTextField tf) throws Exception{
double value;
try{
value = Double.parseDouble(tf.getText()); // Converting String to Double
}
catch (Exception e){
value = 0.0; // If an exception is raised.
}
return value; // Returning value.
}
public void actionPerformed(ActionEvent e){
try{
double value = getDoubleFromTextField(t1); // Calling function.
if(e.getSource()==button1){
double c = (5f/9) * (value - 32); // converting f to c
label.setText(String.format("%.1f F = %.2f C",value,c)); // Setting label text with the given format.
}
else if(e.getSource()==button2){
double f = value *(9f/5) + 32 ; // Converting c to f
label.setText(String.format("%.1f C = %.2f F",value,f)); // Setting label text with the given format.
}
}
catch (Exception e1){

}
}
public static void main(String[] args) {
new TemparatureConverter();
}
}

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