Question

*****Using Java

Write a program that finds the standard deviation while also using a graphical user interface.

Answer 1

package test.gui.stddev;

import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class StdDevGUI {

public StdDevGUI(){
   Frame f= new Frame();   
  
f.setBackground(Color.orange);
f.setTitle("Standard Deviation Calculator");
  
TextField tf1,tf2;
Label l1,l2;
Button btn;
  
l1= new Label("Enter numbers(Comma separarated):");
l1.setBounds(50,60,300,20);
  
   tf1 = new TextField();
   tf1.setBounds(50,90,150,40);
  
  
   l2= new Label("Calculated Standard Deviation:");
   l2.setBounds(50,150,300,20);
  
tf2 = new TextField();
tf2.setBounds(50,180,150,40);
tf2.setEditable(false);
  
btn = new Button("Calculate SD");
btn.setBounds(50,240,100,30);
  
btn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
    String data = tf1.getText();
    String[] dataArr = data.split(",");
    double[] dblArr = new double[dataArr.length];
    for(int i = 0 ; i < dataArr.length; i++){
        dblArr[i] = Double.parseDouble(dataArr[i]);
    }
    double stdDev = calculateStdDev(dblArr);
    tf2.setText(String.valueOf(stdDev));
}
});
  
f.add(l1);
       f.add(tf1);
       f.add(l2);
       f.add(tf2);
       f.add(btn);
      
       f.setSize(400,400);
       f.setLayout(null);
       f.setVisible(true);
}
  
   public static void main(String []args) {       
   new StdDevGUI();
}

/**
* calculate standard deviation
* @param dataArr
* @return
*/
private static double calculateStdDev(double[] dataArr){
   double sum = 0.0;
   double stdDev = 0.0;
     
int length = dataArr.length;

for(double dbl : dataArr) {
sum = sum + dbl;
}
//System.out.println(sum);
double mean = sum/length;
for(double dbl: dataArr) {
   double powered = Math.pow(dbl - mean, 2);
   stdDev = stdDev + powered;
}
//System.out.println(stdDev);
return Math.sqrt(stdDev/length);
}
}

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OUTPUT

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