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Thread: the if statement does not work

  1. #1
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    Default the if statement does not work

    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.text.DecimalFormat;
    import javax.swing.event.*;

    public class japanese extends JApplet {

    public void init() {

    JTextArea outputArea;
    outputArea = new JTextArea(2,10);

    String output = ("");
    JOptionPane.showMessageDialog(null,"uchi or ie ","house",
    JOptionPane.INFORMATION_MESSAGE);
    String house = JOptionPane.showInputDialog("enter the japanese word for " +
    "house");
    String h = new String("uchi");
    String h1 = new String("ie");
    output = ("good");
    outputArea.setText(output);
    if (house == h || house == h1)
    JOptionPane.showMessageDialog(null,outputArea,"hou se",
    JOptionPane.INFORMATION_MESSAGE);

    else
    JOptionPane.showMessageDialog(null,"not good","house",
    JOptionPane.INFORMATION_MESSAGE);
    }
    }


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: the if statement does not work

    Wrap your code in Code tags, ask a question (no, the title doesn't count). Don't compare Strings with ==.

  3. #3
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    Default Re: the if statement does not work

    if((*String*.equalsIgnoreCase(*String variable or String value*))||(*String*.equalsIgnoreCase(*String variable or String value*))){

    /*statement*/

    }

    else{

    /*statement*/


    }

  4. #4
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    Default Re: the if statement does not work

    Quote Originally Posted by PhHein View Post
    Wrap your code in Code tags, ask a question (no, the title doesn't count). Don't compare Strings with ==.
    thank you, it worked.

    Now I am having problems with the actionListener. How do I get it to work so that the volume takes all variables?
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.text.DecimalFormat;
    import java.awt.Container;

    public class rectangularSolid extends JApplet implements ActionListener {

    public void init() {

    String in = JOptionPane.showInputDialog("1(volume),2(surface area),3(diagonal)");
    int input = Integer.parseInt(in);

    switch(input) {

    case 1:
    JLabel prompt;
    JLabel prompt2;
    JLabel prompt3;
    JLabel prompt4;
    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    JTextField insert;
    JTextField insert2;
    JTextField insert3;
    JTextField insert4;
    prompt = new JLabel("enter length");
    insert = new JTextField(10);
    c.add(prompt);
    c.add(insert);
    prompt2 = new JLabel("enter width");
    insert2 = new JTextField(10);
    c.add(prompt2);
    c.add(insert2);
    prompt3 = new JLabel("enter height");
    insert3 = new JTextField(10);
    c.add(prompt3);
    c.add(insert3);
    prompt4 = new JLabel("answer is ");
    insert4 = new JTextField(10);
    c.add(prompt4);
    c.add(insert4);
    insert4.addActionListener(this);
    break;
    case 2:
    JTextArea outputArea;
    outputArea = new JTextArea(2,10);
    Container c1 = getContentPane();
    c1.add(outputArea);
    DecimalFormat twoDigits = new DecimalFormat("0.00");
    String sa = JOptionPane.showInputDialog("enter length");
    double length2 = Double.parseDouble(sa);
    String w2 = JOptionPane.showInputDialog("enter width");
    double width2 = Double.parseDouble(w2);
    String h2 = JOptionPane.showInputDialog("enter height");
    double height2 = Double.parseDouble(h2);
    String output = "";
    output = (" Surface area = "
    + twoDigits.format(surfaceArea(length2,width2,height 2)));
    outputArea.setText(output);
    JOptionPane.showMessageDialog(null,outputArea,null ,
    JOptionPane.INFORMATION_MESSAGE);
    break;}
    }
    public void actionPerformed(ActionEvent e ) {
    double length = Double.parseDouble(e.getActionCommand() );
    double width = Double.parseDouble(e.getActionCommand());
    double height = Double.parseDouble(e.getActionCommand());
    showStatus("Volume is " + volume ( length, width, height ) );
    }
    public double volume(double length, double width, double height) {
    return length * width * height;
    }
    public double surfaceArea(double length2, double width2, double height2) {
    return ( 2 * length2 * width2 + 2 * length2 * height2 + 2 * width2 * height2);

    }
    }

  5. #5
    Super Moderator jps's Avatar
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    Default Re: the if statement does not work

    Please consult the Announcements page for the use of code tags in your posts. If we spend all of our time repairing your post, we have no time left to answer questions.

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