How Do I Detect The Number Of Lower/upper Case? - Topic

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Sep 28 2015 02:36am

I know how to convert lower to upper and vice versa, but how can I detect how many upper and lower cases there are in java?

carteblanche

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Sep 28 2015 07:36am

http://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isUpperCase(char)

Whalefood

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Sep 28 2015 11:20am

I'm not too familiar with java, but I learned basic C++. How would I be able to find how many of a certain letter is either uppercase or lower case in a sentence?

For example the number of "a" and "A" in a string.

labatymo

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Sep 28 2015 11:59am

Iterate through each char and call Character.isUpperCase() to determine if it's uppercase

Code

String test = "Some String";
int upperCaseCount = 0;
for ( char c : test.toCharArray( ) ) {
if ( Character.isUpperCase( c ) ) {
upperCaseCount++;
}
}

Minkomonster

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Sep 28 2015 04:46pm

If you want to count the number of occurences of each character of the alphabet I would recommend using an integer array of length 26.

Whalefood

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Sep 28 2015 05:44pm

Quote (Minkomonster @ Sep 28 2015 05:46pm)

If you want to count the number of occurences of each character of the alphabet I would recommend using an integer array of length 26.

How would I do this? I need to find the number of uppercase I and lowercase i from a sentence input by the user.

Minkomonster

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Sep 28 2015 07:24pm

Quote (Whalefood @ Sep 28 2015 06:44pm)

How would I do this? I need to find the number of uppercase I and lowercase i from a sentence input by the user.

Then it is even simpler.

Using the code labatymo provided you can modify it to do what you need:

Code

String test = "Some String";
int upperCaseCount = 0;
int lowerCaseCount = 0;

for ( char c : test.toCharArray( ) ) {
if ( c == 'I') {
upperCaseCount++;
}
else if(c == 'i'){
lowerCaseCount++;
}
}

Whalefood

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Sep 28 2015 08:04pm

I'm supposed to use charAt method. How can I apply this instead of char c :test.

Whalefood

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Sep 28 2015 09:12pm

Nevermind I got it fixed. I just arranged my lines weird.

Thanks for the help guys

This post was edited by Whalefood on Sep 28 2015 09:33pm

Minkomonster

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#10

Sep 28 2015 09:34pm

Quote (Whalefood @ Sep 28 2015 09:04pm)

I'm supposed to use charAt method. How can I apply this instead of char c :test.

Code

for(int i = 0; i < s.length(); i++)
if(s.charAt(i) == 'I')
//do something

Apply yourself, kid. Or just give up. Its 2015. You can google your way to any degree you can imagine. Here, let me show you:
http://lmgtfy.com/?q=java+count+uppercase+letters

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