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Thread: java awt...if statement not working properly

  1. #1
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    Exclamation java awt...if statement not working properly

    it is a program to find vowels from tect in awt....but it is not doing so may be some problem in if statement


    import java.awt.*;
    import java.awt.event.*;

    class Test implements ActionListener
    {
    Frame fr;

    TextField tf0,tf1;
    Button b;
    Test()
    {
    fr=new Frame();
    fr.setLayout(null);
    tf0=new TextField();
    tf1=new TextField();
    tf0.setBounds(30,40,100,20);
    tf1.setBounds(30,80,50,20);
    fr.add(tf0);
    fr.add(tf1);


    b=new Button("Calculate");
    b.setBounds(25,240,100,20);
    fr.add(b);

    fr.setSize(300,300);
    fr.setVisible(true);
    b.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e)
    {
    if(e.getActionCommand().equals("Calculate"));
    {
    int v=0,k=0,l=0;
    String st=tf0.getText();
    String str[]=st.split("");
    String vowels[]={"a","e","i","o","u"};
    for(int i=0;i<str.length;i++)
    {
    for(int j=0;j<=4;j++)
    if(str[i]== vowels[j]) //this statement is giveing output 0 even when vowels are available
    v++;
    }
    String s1=Integer.toString(v);
    tf1.setText(s1);
    }
    }
    public static void main(String s[])
    {
    new Test();
    }
    }


  2. #2
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    Default Re: java awt...if statement not working properly

    We have no idea what the problem is unless you provide more details.
    String str[]=st.split("");
    Are you sure that line is doing what you want? If you want to break a String into an array of characters then perhaps use toCharArray method instead. Having said that I just realised you are making the common mistake of using == to compare Strings, use the equals method instead.
    Improving the world one idiot at a time!

  3. #3
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    Default Re: java awt...if statement not working properly

    yes i am sure that split line is working fine.i have already checked that
    thanks for taking interest in solving the problem
    in case you find the solution please let me know
    thanks again

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    Default Re: java awt...if statement not working properly

    Did you read the second part of my post?
    Improving the world one idiot at a time!

  5. #5
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    Default Re: java awt...if statement not working properly

    thanks a lot i have just tried the second part and its working fine now
    can you please explain me why this happen??
    i mean why its working by using equals but not ==

    --- Update ---

    [/COLOR]if we use if(str[i].equals("a")) or if(str[i]=="a")
    instead of using a string array its still not working can you please explain me the reason
    Last edited by edward005; June 28th, 2013 at 12:13 AM. Reason: not autosaved

  6. #6
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    Default Re: java awt...if statement not working properly

    Quote Originally Posted by edward005 View Post
    ...if we use if(str[i].equals("a")) or if(str[i]=="a")
    instead of using a string array its still not working can you please explain me the reason
    What does the documentation say about the use of String.equals? What does it say about using ==? Post any questions you have remaining

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