JAVA(use code provided) This code currently takes the tokens in a string and puts it into an array list. For example "6 + 7 -84.2" ===> 6, +, 7, -, 84.2
JAVA(use code provided) This code currently takes the tokens in a string and puts it into an array list. For example "6 + 7 -84.2" ===> 6, +, 7, -, 84.2
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Computer science
Transcribed Image Text:JAVA(use code provided)
This code currently takes the tokens in a string and puts it into an array list. For
example "6 +7 -84.2" ===> 6, +, 7, -, 84.2
For example " - +*" - -+,*
For example "5" - 5
For example 67 + 12/45/7%0 ===> 67, +, 12, /, 45, /, 7, %, 0
Please make it so that it returns null when the string expression is
invalid/mathematically does not make sense.
For example "1x + 5 + 10" - null
For example ".9 +.7 - 2" null
ONLY USE BASIC IF STATEMENTS FOR THIS. NO JAVA FUNCTIONS LIKE
isletter() or isdigit(). NO STRINGBUILDER as well. NO LIBRARIES AS WELL.
ONLY IF STATEMENTS. KEEP IT BASIC PLEASE. Remember that it needs to take
out individual tokens in a string, and put them into the arraylist as well like was
done in my code. ===> NULL ===> NULL 53 ===> 536+7-84.2 ===> 6+7-
84.2 - +* ===> - + *
89x + 4 ===>
NULL
.9 +7. - 2 ===> NULL
import java.util.ArrayList;
import java.util.List;
public class Math (
static public List tokenizer(String exprn) {
List tokens = new ArrayList();
String currentToken = "";
for (int i = 0; i< exprn.length(); i++){
char c = exprn.charAt(i);
if (c == '') {
if (currentToken.length() > 0) {
tokens.add(currentToken);
currentToken = "";
else if (c == " || (c >= '0' && c <= '9')) {
currentToken += c;
else {
if (currentToken.length() > 0) {
tokens.add(currentToken);
currentToken = "" + c;
tokens.add(currentToken);
currentToken = "";
}
if (currentToken.length() > 0) {
tokens.add(currentToken);
return tokens;
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