Hypotenuse Calculations

[Nightcrawler]

I have a programming assignment that is supposed to take the lengths of the two legs of a given right triangle and calculate the hypotenuse. My code is below, but when I try to compile, it says that my main method needs to be declared as public static void. If I make it static, however, I am told that I cannot reference non-static content within a static context. What should I do?

package winniethepooh;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class WinniethePooh extends JApplet implements ActionListener
{
    JTextField inputA;
    JTextField inputB;
    JLabel firstmandate;
    JLabel secondmandate;

    @Override public void init()
    {
    inputA = new JTextField(4);
    inputB = new JTextField(4);
    inputB.addActionListener(this);
    firstmandate = new JLabel("Enter the length of leg A: ");
    secondmandate = new JLabel("Enter the length of leg B: ");

    Container content = getContentPane();

    content.setLayout(new FlowLayout());
    content.add(inputA);
    content.add(inputB);
    content.add(firstmandate);
    content.add(secondmandate);
    }

    @Override public void actionPerformed(java.awt.event.ActionEvent e)
    {
    double legA;
    double legB;

    legA = Double.parseDouble(inputA.getText());
    legB = Double.parseDouble(inputB.getText());

    double hypotenuse = hypotenuse(legA, legB);
        showStatus("The length of the hypotenuse is: " + hypotenuse);
    }

    public double hypotneuse(double legA, double legB)
    {
        double hypotenusesquared = Math.pow(legA, 2) + Math.pow(legB, 2);
            return Math.sqrt(hypotenusesquared);
    }
}

[JosAH]

I don't see a main( ... ) method whatsoever and a JApplet doesn't need one.

kind regards,

Jos

[DarrylBurke]

First off, are you tasked to write an Applet or an application?

db

[Nightcrawler]

An application. Also, I didn't think I needed to import JApplet, I tried importing javax.swing.*, java.awt.event.*, and java.awt.* and was told that it didn't follow the specified coding rules, so I told Netbeans to organise imports and it added JApplet instead. But the project file is a Java Application.

[noobplus]

I have a programming assignment that is supposed to take the lengths of the two legs of a given right triangle and calculate the hypotenuse. My code is below, but when I try to compile, it says that my main method needs to be declared as public static void. If I make it static, however, I am told that I cannot reference non-static content within a static context. What should I do?

package winniethepooh;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class WinniethePooh extends JApplet implements ActionListener
{
    JTextField inputA;
    JTextField inputB;
    JLabel firstmandate;
    JLabel secondmandate;

    public void main(String[] args)
    {
    inputA = new JTextField(4);
    inputB = new JTextField(4);
    inputB.addActionListener(this);
    firstmandate = new JLabel("Enter the length of leg A: ");
    secondmandate = new JLabel("Enter the length of leg B: ");

    Container content = getContentPane();

    content.setLayout(new FlowLayout());
    content.add(inputA);
    content.add(inputB);
    content.add(firstmandate);
    content.add(secondmandate);
    }

    @Override public void actionPerformed(java.awt.event.ActionEvent e)
    {
    double legA;
    double legB;

    legA = Double.parseDouble(inputA.getText());
    legB = Double.parseDouble(inputB.getText());

    double hypotenuse = hypotenuse(legA, legB);
        showStatus("The length of the hypotenuse is: " + hypotenuse);
    }

    public double hypotneuse(double legA, double legB)
    {
        double hypotenusesquared = Math.pow(legA, 2) + Math.pow(legB, 2);
            return Math.sqrt(hypotenusesquared);
    }
}

line 45: spelling mistake replace "hypotneuse" by "hypotenuse"

regards
dhililp

[noobplus]

I have a programming assignment that is supposed to take the lengths of the two legs of a given right triangle and calculate the hypotenuse. My code is below, but when I try to compile, it says that my main method needs to be declared as public static void. If I make it static, however, I am told that I cannot reference non-static content within a static context. What should I do?

package winniethepooh;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class WinniethePooh extends JApplet implements ActionListener
{
    JTextField inputA;
    JTextField inputB;
    JLabel firstmandate;
    JLabel secondmandate;

    public void main(String[] args)
    {
    inputA = new JTextField(4);
    inputB = new JTextField(4);
    inputB.addActionListener(this);
    firstmandate = new JLabel("Enter the length of leg A: ");
    secondmandate = new JLabel("Enter the length of leg B: ");

    Container content = getContentPane();

    content.setLayout(new FlowLayout());
    content.add(inputA);
    content.add(inputB);
    content.add(firstmandate);
    content.add(secondmandate);
    }

    @Override public void actionPerformed(java.awt.event.ActionEvent e)
    {
    double legA;
    double legB;

    legA = Double.parseDouble(inputA.getText());
    legB = Double.parseDouble(inputB.getText());

    double hypotenuse = hypotenuse(legA, legB);
        showStatus("The length of the hypotenuse is: " + hypotenuse);
    }

    public double hypotneuse(double legA, double legB)
    {
        double hypotenusesquared = Math.pow(legA, 2) + Math.pow(legB, 2);
            return Math.sqrt(hypotenusesquared);
    }
}

this would work

    import java.awt.Container;
    import java.awt.FlowLayout;
    import java.awt.event.ActionListener;
    import javax.swing.JApplet;
    import javax.swing.JLabel;
    import javax.swing.JTextField;
     
    public class WinniethePooh extends JApplet implements ActionListener
    {
        JTextField inputA;
        JTextField inputB;
        JLabel firstmandate;
        JLabel secondmandate;
     
        @Override public void init()
        {
        inputA = new JTextField(4);
        inputB = new JTextField(4);
        inputB.addActionListener(this);
        firstmandate = new JLabel("Enter the length of leg A: ");
        secondmandate = new JLabel("Enter the length of leg B: ");
     
        Container content = getContentPane();
     
        content.setLayout(new FlowLayout());
        content.add(inputA);
        content.add(inputB);
        content.add(firstmandate);
        content.add(secondmandate);
        }
     
        @Override public void actionPerformed(java.awt.event.ActionEvent e)
        {
        double legA;
        double legB;
     
        legA = Double.parseDouble(inputA.getText());
        legB = Double.parseDouble(inputB.getText());
     
        double hypotenuse = hypotneuse(legA, legB);
            showStatus("The length of the hypotenuse is: " + hypotenuse);
        }
     
        public double hypotneuse(double legA, double legB)
        {
            double hypotenusesquared = Math.pow(legA, 2) + Math.pow(legB, 2);
                return Math.sqrt(hypotenusesquared);
        }
       
        
    
        public static void main(String[] args)
        {
        	WinniethePooh a = new WinniethePooh(); 
        }
    }

[Nightcrawler]

I fixed the spelling error, but just tacking that main method onto the end of the program does let it compile without errors, but it doesn't execute anything. It just says build successful total time: 0 seconds with a blank output pane.

[noobplus]

I have a programming assignment that is supposed to take the lengths of the two legs of a given right triangle and calculate the hypotenuse. My code is below, but when I try to compile, it says that my main method needs to be declared as public static void. If I make it static, however, I am told that I cannot reference non-static content within a static context. What should I do?

you can take the two legs as arguments

public class hypotenuse{
public static void getHypotenuse(double a,double b)
{
 System.out.println (Math.sqrt(Math.pow(a,2)+Math.pow(a,2)));
}
public static void main(String[] args)
{
  String x=args[0];
  String y=args[1];
  hypotenuse h = new hypotenuse();
  getHypotenuse(Double.valueOf(x).doubleValue(),Double.valueOf(y).doubleValue()); //parsing. 'D' caps in Double during parsing 
 }
}

dhilip

[noobplus]

I fixed the spelling error, but just tacking that main method onto the end of the program does let it compile without errors, but it doesn't execute anything. It just says build successful total time: 0 seconds with a blank output pane.

add

WinniethePooh a = new WinniethePooh();  //object initialized to start the class extending the JApplet

to the main

regards,
dhilip

[j2me64]

since the app is an applet you don't need a main() and no new WinniethePooh() is needed

[noobplus]

I have a programming assignment that is supposed to take the lengths of the two legs of a given right triangle and calculate the hypotenuse. My code is below, but when I try to compile, it says that my main method needs to be declared as public static void. If I make it static, however, I am told that I cannot reference non-static content within a static context. What should I do?

this would work.

    import java.awt.Container;
    import java.awt.FlowLayout;
    import java.awt.event.ActionListener;
    import javax.swing.JApplet;
    import javax.swing.JLabel;
    import javax.swing.JTextField;
     
    public class WinniethePooh extends JApplet implements ActionListener
    {
        JTextField inputA;
        JTextField inputB;
        JLabel firstmandate;
        JLabel secondmandate;
     
        @Override public void init()
        {
        inputA = new JTextField(4);
        inputB = new JTextField(4);
        inputB.addActionListener(this);
        firstmandate = new JLabel("Enter the length of leg A: ");
        secondmandate = new JLabel("Enter the length of leg B: ");
     
        Container content = getContentPane();
     
        content.setLayout(new FlowLayout());
        content.add(inputA);
        content.add(inputB);
        content.add(firstmandate);
        content.add(secondmandate);
        }
     
        @Override public void actionPerformed(java.awt.event.ActionEvent e)
        {
        double legA;
        double legB;
     
        legA = Double.parseDouble(inputA.getText());
        legB = Double.parseDouble(inputB.getText());
     
        double hypotenuse = hypotenuse(legA, legB);
            showStatus("The length of the hypotenuse is: " + hypotenuse);
        }
     
        public double hypotenuse(double legA, double legB)
        {
            double hypotenusesquared = Math.pow(legA, 2) + Math.pow(legB, 2);
                return Math.sqrt(hypotenusesquared);
        }
       
        
    
        
    }
//get errors still?

regards
dhilip

[JosAH]

since the app is an applet you don't need a main() and no new WinniethePooh() is needed

Don't even bother, this thread has become a story of the lame leading the blind (or vice versa).

kind regards,

Jos

[noobplus]

Don't even bother, this thread has become a story of the lame leading the blind (or vice versa).

kind regards,

Jos

my account had 1,00,000 rep points yesterday. someone hacked. that answers all the problems

regards
dhilip

[JosAH]

my account had 1,00,000 rep points yesterday. someone hacked. that answers all the problems

Read this carefully: only reply if you know for sure that you know the answer and please test the code in your reply if you do reply. Otherwise this forum will become a mess before you know it.

kind regards,

Jos

[noobplus]

Read this carefully: only reply if you know for sure that you know the answer and please test the code in your reply if you do reply. Otherwise this forum will become a mess before you know it.

kind regards,

Jos

except the "factorial()" mistake, all other codes of mine , I tested in eclipse, they showed no errors
and yeah I was telling wrong about "add this to main".. won't repeat that

thx
dhilip

[Nightcrawler]

Post #11 that says, "this would work." is the exact same code I originally posted...

JosAH, if a JApplet doesn't need a main method, then what is wrong with my original code that won't compile because I don't have a public static void main method?

[noobplus]

Post #11 that says, "this would work." is the exact same code I originally posted...

JosAH, if a JApplet doesn't need a main method, then what is wrong with my original code that won't compile because I don't have a public static void main method?

your code show errors? no way bro , not even run-time errors (except that spelling mistake)

regards
dhilip

[Nightcrawler]

Other than the spelling error it's the exact same code I originally posted, and after fixing the spelling error it still won't compile because it claims there's no mian method.

[JosAH]

JosAH, if a JApplet doesn't need a main method, then what is wrong with my original code that won't compile because I don't have a public static void main method?

An Applet or JApplet doesn't need a main( ... ) method but you can't run it if it were an application. An application does need such a method. (J)Applets run in your browser or in an applet viewer.

kind regards,

Jos

[noobplus]

Other than the spelling error it's the exact same code I originally posted, and after fixing the spelling error it still won't compile because it claims there's no mian method.

you need to run the codings using an applet.
for eclipse,
run-->run configurations--> java-applets(on the left side pane of the dialog box)-->click new button--> click run
(by default, it will be in application running mode)

regards
dhilip