Question

java

# 5 (to be finished later) Develop at application with GUI that will be calculating volume of a cylinder in cubic centimeters (see Day 2, practice exercise 2 and feel free to use the program you worked on). 1) Start with the layout. Plan the entry field, plan the buttons layout. Feel free to use this picture (to make it more appealing to the user): eds.l

Answer 1

code:

import java.awt.*;
import java.awt.event.*;
class CylinderVolume extends Frame implements ActionListener
{
   TextField t1,t2,t3; //Text fields declaration
   Label l3;

//Adds components to the awindow or Frame, binds the action listener to the button, where volume computation is done.
   CylinderVolume()
   {
       super("CylinderVolume");
       Label l1=new Label("Height of Cylineder:");
       t1=new TextField();
       Label l2=new Label("Radius of Cylineder:");
       l3=new Label("");
       t2=new TextField();
       t3=new TextField();
       t3.setEditable(false);
       Button b=new Button("Compute Volume");
       Label l4=new Label("Volume:");
       b.addActionListener(this);
       setLayout(null);
       setVisible(true);
       setSize(400,400);
       l1.setBounds(20,80,130,20);
       add(l1);
       l2.setBounds(20,140,130,20);
       add(l2);
       l3.setBounds(20,260,300,20);
       add(l3);
       l4.setBounds(20,210,130,20);
       add(l4);
       t1.setBounds(150,90,100,20);
       add(t1);
       t2.setBounds(150,150,100,20);
       add(t2);
       t3.setBounds(150,210,100,20);
       add(t3);
       b.setBounds(150,310,100,20);
       add(b);
   }
   public void actionPerformed(ActionEvent ae)
   {
       try{
           double height=Double.parseDouble(t1.getText());
           double radius=Double.parseDouble(t2.getText());
           t3.setText(""+(Math.PI*height*radius*radius));
           l3.setText("");
       }
       catch(Exception e)
       {
           t3.setText("");
           l3.setText("Enter valid inputs to compute volume");
       }
   }
   public static void main(String[] args) {
       new CylinderVolume();
   }

}

Sample i/o:

For invalid inputs

X CylinderVolume Height of Cylineder: 10 Radius of Cylineder a Volume: Enter valid inputs to compute volume

For valid inputs:

X CylinderVolume Height of Cylineder: 10 Radius of Cylineder: 20 12566.37061435 Volume: Compute Volume

Explanation:

The tank image is not used here as it is mentioned optional. A java frame is created that has awt components, button is binded with a action listener where volume is calculated.