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Java Extended
course content

Course Content

Java Extended

Java Extended

1. Deep Java Structure
How does the compiler works?Data transfer in JavaFinal KeywordImporting LibrariesUsing Libraries In Our CodeTernary OperatorEnhanced Switch Statement
2. Methods
What is a Method?Creating Our Own MethodsChallenge: Names Starting with Letter BVoidMethods PracticeMethod Overloading RecursionSorting Even Numbers Challenge
3. String Advanced
Deeper into StringMethod split()Uppercase Even Words ChallengeindexOf() methodCharacter Indices Sum Challengetrim() MethodSubstring First and Last Characters Challenge
4. Classes
What is class?Main Class and MethodAccess modifiersClass CreationCat Meowing ChallengeConstructorTeam Constructor ChallengeMethod toString()Parrot Information Display Challenge
5. Classes Advanced
Complex Classes UsagePet and Owner Relationship ChallengePrivate ModifierAnimal Information Display ChallengeGetter and SetterCountry Information Management ChallengeSummary

booktrim() Method

How can we get rid of extra space characters?

Sometimes a string may have leading or trailing spaces, which can cause issues in our code. However, Java developers have provided a solution for this by introducing the trim() method. What does it do? This method removes leading and trailing spaces from a string. If there are no leading or trailing spaces, the trim() method simply returns the original string. If the entire string consists of spaces, the trim() method will return an empty string.

Let's take a look at an example:

java

Main

copy

              
1234567891011

            
package com.example;

public class Main {
    // do not change code from below
    public static void main(String[] args) {
        String string = "   This string contains unnecessary space symbols       ";
        System.out.println("String before using trim() method: " + string);
        System.out.println("String after using trim() method: " + string.trim());
    }
    // do not change the code above
}

That's essentially all we can say about this method. However, the trim() method does a lot of good and significantly simplifies working with strings.

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Section 3. Chapter 6
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