import javax.swing.JOptionPane;
public class sentenceStructure
{
	public static void main(String[] args)
	{
	//Get user input
	String s = JOptionPane.showInputDialog(null, "Enter more than one sentence.");
	String[] sarray = s.split("'.','?','!'");
 
		for (String begin: sarray)
		{
 
		String capitalize = begin.substring(0, 1).toUpperCase() + 
        				begin.substring(1, begin.length() - 1);
 
		//Show input capitalized
		JOptionPane.showMessageDialog(null, capitalize);
		}
 
		System.exit(0);
	}
}

String[] sarray = s.split("[\\.?!]");

begin.substring(1, begin.length() - 1)

begin.substring(1)

	String[] strarray = s.split("\\p{Space}");

import java.util.regex.*;
 
public class SentenceTester {
 
  public static void main(final String[] args) {
    splitTest();
  }
 
  // Implement a splitting logic using regex which also works for 
  // multi line strings.
  private static void splitTest() {
    String line = "hello there!!!!! how're you doing? " + 
      "\ni am pretty sure you are doing well.\nright?";
 
    // Pattern: Any-of-.?!{1, n} followed by whitespace{0, n}
    Pattern pat = Pattern.compile("[.?!]+\\s*", Pattern.DOTALL);
 
    // Create matcher instance which will match the given regex with
    // the line in consideration.
    Matcher mat = pat.matcher(line);
 
    int start = 0, end = 0;
    while(mat.find()) {
      start = end;
      // return a `1 based index' into the string where the pattern
      // match ends. Hence when `end' is 17 means character at 
      // position 18 in the string.
      end = mat.end();
      System.out.println("#" + line.substring(start, end) + "#");
    }    
  }
 
}