[jingojang]

Hello,

I'm kinda new to Java but I like it and it is a lot of fun. I got some trouble finding out how to print out the first and last word in an entered sentence.

Say you have a JOptionPane.showInputDialog coming up for the user, the user enters a sentence of a minimum of 2 words. When he hits "Ok" I want the first word and last word to be displayed in the same JOptionPane.showMessageDialog.

Ex sentence. Hello world
First word: Hello
Last word: world

I was really trying on my own but did not get that far, I was able to use this on one set String. Here is my code, please help me get so I can type my own sentence.

PHP Code:

package blabla;

import javax.swing.JOptionPane;

public class blabla {
    public static void main(String[] args)
    {
        String s = "Able was I ere I saw Elba";
        String firstWord = s.substring(0, s.indexOf(' '));
        JOptionPane.showMessageDialog(null, "You have entered a total of "
                            + s.length()
                                + " characters\n"
                                    + "First word: "
                                        + firstWord
                                            + "\nLast word: "
                                                + s.substring (s.lastIndexOf(' '), s.length()));
    }
} 


[Powerlord]

You need to replace the existing string with a call to JOptionPane.showInputDialog, which returns the input as a String.

Something like

PHP Code:

String s = JOptionPane.showInputDialog("Enter a sentence"); 


There are also more complicated forms of showInputDialog that allow you to specify a dialog title, message type, etc...

[nikhilgupta345]

Look up the String split() function: it splits a string into an array of smaller strings, based on a certain delimiter (basically where you want to separate the strings from). You can make it so that it splits it based on a space, so you will get an array of words, in your case. Then take the 0 index and the length-1 index of that array, and those will give you the first and last words entered.

[jingojang]

Originally Posted by nikhilgupta345 Look up the String split() function: it splits a string into an array of smaller strings, based on a certain delimiter (basically where you want to separate the strings from). You can make it so that it splits it based on a space, so you will get an array of words, in your case. Then take the 0 index and the length-1 index of that array, and those will give you the first and last words entered.

Hi nikilgupta345, would you mind creating an example?

[Ade]

Originally Posted by jingojang Hi nikilgupta345, would you mind creating an example?

http://docs.oracle.com/javase/7/docs...lang.String%29

[nikhilgupta345]

Originally Posted by jingojang Hi nikilgupta345, would you mind creating an example?

PHP Code:

String s = "This is a string";
String[] splitString = s.split();
// splitString = {"This", "is", "a", "string"}
String firstWord = splitString[0];
String lastWord = splitString[splitString.length - 1];

System.out.println("First word: " + firstWord + " Last word: " + lastWord); 


[Powerlord]

Wow, I really had a blonde moment in my previous post, didn't I?

[jingojang]

Thanks nikilgupta345

EDIT: nikilgupta345 you should be able to type in your own sentence, not put a sentence in a String. (JOptionPane.showInputDialog)

[nikhilgupta345]

PHP Code:

String input = JOptionPane.showInputDialog("Please input a string.");
String[] arrayOfWords = input.split(" ");
System.out.println("First word: " + arrayOfWords[0] + " Last word: " + arrayOfWords[arrayOfWords.length - 1]);