Laboratory: Exploring Java String Methods

Developed by: Baticos, Andric Quinn S.

Screenshot of Proof

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Exercise 1: length() - Finding the String's Size

Code Snippet

Prediction: This code will output 14 as there are 14 characters in the string "Hello, Cadets!" (including whitespace and symbols).

Output

Observation: As expected, the value returned by the length() method was 14.

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Exercise 2: charAt() - Accessing a Character

Code Snippet

Prediction: This code will output the character 'l'.

Output

Observation: As expected, the value returned by the charAt() method was 'l'.

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Exercise 3: substring() - Extracting a Part of a String

Code Snippet

Prediction: This code will output the string 'is ' (including the whitespace).

Output

Observation: The value returned by the substring() method was 'is' only.

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Exercise 4: toUpperCase() and toLowerCase() - Changing Case

Code Snippet

Prediction: This code will output the strings "THIS IS A TEST" and "this is a test" respectively.

Output

Observation: As expected, the value returned by the toUpperCase() and toLowerCase() methods were "THIS IS A TEST" and "this is a test" respectively.

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Exercise 5: indexOf() - Finding a Character or Substring

Code Snippet

Prediction: This code will output the indexes 16, 37, and -1.

Output

Observation: As expected, the value returned by indexOf() were 16 (first index 'f' when fox matches, 37 (match z), and -1 (no match).

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Exercise 6: equals() vs. equalsIgnoreCase() - Comparing Strings

Code Snippet

Prediction: This code will output the values false, true, and true.

Output

Observation: As expected, the values returned by equals() were false and true, and the value returned by equalsIgnoreCase() was true.

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Exercise 7: replace() - Replacing Characters

Code Snippet

Prediction: This code will output the new string "I like dogs. Cats are cute".

Output

Observation: As expected, the string "cats" was replaced by "dogs".

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Exercise 8: trim() - Removing Whitespace

Code Snippet

Prediction: This code will remove the whitespace before and after 'Lots of spaces'. The length printed will be: 20 & 14.

Output

Observation: As expected, the whitespaces were removed and reduced the length of the string.