Finding tokens within a string using a searching loop JAVA

Question

So basically I'm trying to write a method that takes 2 strings as parameters and returns a boolean. It returns true if t occurs as a token within s, and returns false if otherwise.

I'm pretty new to coding so I don't really know what i'm doing wrong, any help is appreciated!

Here's my code:

public static boolean containsToken(String s, String t) {

 Scanner scr = new Scanner(s);

This scanner breaks up String s into tokens

for(int i = 0; i < s.length(); i++) {

I tried to make this for loop search through the length of s for tokens that match up with String t

if(t.contains(scr.next()))

return true;
}
return false; 


}

Can you give an example of `s` and `t` for which `containsToken` should return `true`? — ernest_k, Sep 19 '18 at 16:47
`This scanner breaks up String s into tokens` Are you sure scanner is changing the value of s? You're not just iterating the characters of the string passed? — dustytrash, Sep 19 '18 at 16:48
@ernest_k assertTrue(containsTokens("xyx xyy xyz xyz", "xyz"); — Axa Laxa, Sep 19 '18 at 16:58
@dustytrash could you elaborate? Sorry i'm very new to this. — Axa Laxa, Sep 19 '18 at 16:59
Can you please provide sample input and output in your question. — Nicholas K, Sep 19 '18 at 17:18
@AxaLaxa What's wrong with the `contains()` String function? Given your example, assertTrue(`"xyx xyy xyz xyz".contains("xyz"))` passes. No need to write your own function — dustytrash, Sep 19 '18 at 17:24

score 0 · Answer 1 · answered Sep 19 '18 at 17:18

0

Scanner is predominantly used for taking inputs from a stream like system.in. Since you are provided with the whole string from the start you can tokenize it however fits your need with split

answered Sep 19 '18 at 17:18

lvoelk

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Finding tokens within a string using a searching loop JAVA

1 Answers1