StringSet Yet Again

In several labs we've written classes that stored and analyzed String objects. The Inheritance lesson had StringSet Revisited and Writing Classes Better had the original StringSet. Use one of these previously written classes in this program (it doesn't really matter which--they do the same thing).

The Program

Write a WidgetViewer application. Create a class StringAnalysis.

This class has an event handler inner that extends WidgetViewerActionEvent

it has instance variables

StringSet sSet

JTextField inputStr

JLabel numStr

JLabel numChar

In the constructor,

create a WidgetViewer object

create sSet

create a local variable JLabel prompt initialized to "Enter a String"

create inputStr with some number of columns

create a local variable JButton pushMe initialized to "Push to include String"

create numStr initialized to "Number of Strings: 0"

create numChar initalized to "Number of Characters: 0"

create an event handler object and add it as a listener to pushMe

add prompt, inputStr, pushMe, numStr and numChar to your WidgetView object.

Your event handler should add inputStr's contents to sSet and set inputStr to "". It should update numStr and numChar labels to contain sSet's current information.

(Here is the StringSet program that is supposed to be used):

import java.util.Scanner;

public class StringSet {

private String[] arr; private int count;

public StringSet() { arr = new String[200]; count = 0; }

void add(String newStr){ arr[count++] = newStr; }

int size(){ return count; }

int numChars(){ int total = 0; for(int i = 0; i < count; ++i){ total += arr[i].length(); } return total; }

int countStrings(int len){ int total = 0; for(int i = 0; i < count; ++i){ if(arr[i].length() == len) ++total; } return total; }

}

class StringSetTester {

public static void main(String[] args){ StringSet stringSet = new StringSet(); Scanner kybd = new Scanner(System.in); System.out.print("How many strings will you enter? "); int numStr = kybd.nextInt(); // stops after the number, leaves end of line or other whitespace kybd.nextLine(); // "eats" everything up to and including the next newline for(int i = 0; i < numStr; ++i){ stringSet.add(kybd.nextLine()); } System.out.println("Size: " + stringSet.size()); System.out.println("numChars: " + stringSet.numChars()); int len; while(true){ System.out.print("Enter a string length to search for (or 0 to exit): "); len = kybd.nextInt(); if(len == 0) break; System.out.println("Number of strings with length " + len + " are " + stringSet.countStrings(len)); } }

}