this program have write error,
exception in thread "main" java.lang.arrayindexoutofboundsexception: 50 write complete program using 2 arrays, upper , lower keep upper , lower alphabet respectively. ask user enter string example:
this test jupiter. see jupiter!!! may dr. d.
your program should parse string , keep track of number of alphabet. both arrays indexed 0 25. logical way use upper[0] count number of ‘a’, , upper[1] count number of ‘b’ , on. likewise lower array.
output should like:
a: 0 a:2 b: 0 b:0 . . . z:0 z:0 code
import java.awt.*; import javax.swing.*; import java.io.*; import java.util.*; public class letter { public static void main(string[] args) { // results char[] chars = userenters(); system.out.println(); system.out.println("occurrences of each letter are:"); printarray(countlow(chars), countup(chars)); } public static char[] userenters() { string inputx = joptionpane.showinputdialog("enter line of text: "); char[] chars = inputx.tochararray(); return chars; } public static int[] countlow(char[] input) { int[] counts = new int[26]; (int = 0; < input.length; i++) { counts[input[i] - 'a']++; } return counts; } public static int[] countup(char[] input2) { int[] countsup = new int[26]; (int = 0; < input2.length; i++) { countsup[input2[i] - 'a']++; } return countsup; } public static void printarray(int[] counts, int[] countsup) { (int = 0; < counts.length; i++) { system.out.print(counts[i] + " " + (char) ('a' + i) + " "); system.out.print(countsup[i] + " " + (char) ('a' + i) + "\n"); } } }
i hope don't mind did refactor code bit.
please have @ alterantive solution problem , read comments @ bottom of answer.
import java.util.hashmap; import java.util.map; import java.util.map.entry; import javax.swing.joptionpane; public class lettercounter { //hash maps don't allow duplication. //the letter key , repetitions value(your goal!) private map<character, integer> resultsmap = new hashmap<character, integer>(); public static void main(string[] args) { lettercounter lettercounter = new lettercounter(); lettercounter.fillmap(); lettercounter.showmapcontents(); } private void showmapcontents() { (entry<character, integer> entry : resultsmap.entryset()) { system.out.println("'" + entry.getkey() + "' - " + entry.getvalue() + " times"); } } private void fillmap() { char[] userinputasarray = getuserinputasletterarray(); (int currentletter = 0; currentletter < userinputasarray.length; currentletter++) { int count = getoccurences(userinputasarray[currentletter],userinputasarray); resultsmap.put(userinputasarray[currentletter], count); } } private int getoccurences(int letter, char[] userinputasarray) { int counter = 0; (int currentindex = 0; currentindex < userinputasarray.length; currentindex++) { if(userinputasarray[currentindex] == letter) counter++; } return counter; } public char[] getuserinputasletterarray() { string userinput = joptionpane.showinputdialog("enter line of text: "); char[] chars = userinput.tochararray(); return chars; } } - whenever want exercise need manipulate data, should pick best data structure job. in case, think hash map interesting because avoids duplicates , big part of job you. find cheat sheet in link: http://www.janeve.me/articles/which-java-collection-to-use
- i noticed used lot static , not object oriented thing do. alternative, when want on run quick examples one, can initialize class inside itself.
i hope useful.
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