Java contains() method not working properly

Question

I'm writing small condition to check if certain character are exist or not in java. This is my string: May i know how much I spent on food?

I'm checking if food string is exist or not, if i check "food" in if condition I'm getting proper response, if i use "Food" or "fOod" or "fOOd" or "fooD" its always going to else block. What I'm doing wrong here:

String food = "may i know how much I spent on food";

if(food.contains("Food")) {
    System.out.println("Food Expense is 32");

} else {
    System.out.println("Not Matching");
}

contains is not a case insensitive search; in your example, it looks literally for "Food" with a capital "F" — KevinO, Jul 24 '17 at 01:18
suppose you refer the java doc on `String contains()` method. it is `public boolean contains(CharSequence s)` and it takes only a `CharSequence` — Rajith Pemabandu, Jul 24 '17 at 01:22
When you "learn jquery" you'll know that Javascript is a case sensitive search by default too. — stdunbar, Jul 24 '17 at 01:59

anon · Answer 1 · 2017-07-24T01:25:05.977

3

That is because the difference in cases. "Food".equals("food") will give you false. To solve the problem of cases you can convert everything to lower when searching

if (food.toLowerCase().contains("Food".toLowerCase())) {}

And you can have any variation of food in the if condition. No need to worry about case sensitivity with this

edited Jul 24 '17 at 01:25

answered Jul 24 '17 at 01:21

anon

1,258
10
17

score 0 · Answer 2 · answered Jul 24 '17 at 01:20

0

Try this

if(food.toLowerCase().contains("Food".toLowerCase())) {
System.out.println("Food Expense is 32");

} else {
System.out.println("Not Matching");
}

answered Jul 24 '17 at 01:20

Mike Smith

23
1
6

Advice: "Try this" answers generally don't get upvotes. An answer should explain what was wrong with the original code, and how the new code fixes it. (Contrast the other answer to this question.) – Kevin J. Chase Jul 24 '17 at 02:53

Java contains() method not working properly

2 Answers2