Master Java Substrings or Make a Common Mistake! π―
Test your Java skills with this tricky substring puzzle! Can you predict the output? Let's analyze it step by step and improve your coding mastery. π #Java #CodingChallenge

Wiingy AP Computer Science
939 views β’ Mar 17, 2025

About this video
π’ Description:
Can you predict the output of this Java substring puzzle? Let's break it down step by step! π
#Java #CodingChallenge
π’ Question:
What will be printed by the following Java code?
java
Copy
Edit
String s = "Computer Science is fun!";
String s1 = s.substring(0,8);
String s2 = s1.substring(1);
String s3 = s2.substring(1,3);
System.out.println(s3);
(A) mput
(B) mpu
(C) mp β
(D) omp
Quick Breakdown:
1οΈβ£ Extracting s1:
java
Copy
Edit
s1 = s.substring(0,8);
This gives "Computer" (characters from index 0 to 7).
2οΈβ£ Extracting s2:
java
Copy
Edit
s2 = s1.substring(1);
Removes the first character 'C', leaving "omputer".
3οΈβ£ Extracting s3:
java
Copy
Edit
s3 = s2.substring(1,3);
Takes characters from index 1 to 3 in "omputer", which is "mp".
π― Final Answer: Option C!
π Key Takeaways:
β substring(start, end) extracts characters from start index to end index - 1.
β Java strings are zero-based, so counting starts from index 0.
β Understanding how substring() works is crucial for coding interviews & exams!
π Got it? Comment below & donβt forget to like & subscribe for more coding tricks! π―π₯
#JavaCoding #Programming #Substring #InterviewQuestions π
Can you predict the output of this Java substring puzzle? Let's break it down step by step! π
#Java #CodingChallenge
π’ Question:
What will be printed by the following Java code?
java
Copy
Edit
String s = "Computer Science is fun!";
String s1 = s.substring(0,8);
String s2 = s1.substring(1);
String s3 = s2.substring(1,3);
System.out.println(s3);
(A) mput
(B) mpu
(C) mp β
(D) omp
Quick Breakdown:
1οΈβ£ Extracting s1:
java
Copy
Edit
s1 = s.substring(0,8);
This gives "Computer" (characters from index 0 to 7).
2οΈβ£ Extracting s2:
java
Copy
Edit
s2 = s1.substring(1);
Removes the first character 'C', leaving "omputer".
3οΈβ£ Extracting s3:
java
Copy
Edit
s3 = s2.substring(1,3);
Takes characters from index 1 to 3 in "omputer", which is "mp".
π― Final Answer: Option C!
π Key Takeaways:
β substring(start, end) extracts characters from start index to end index - 1.
β Java strings are zero-based, so counting starts from index 0.
β Understanding how substring() works is crucial for coding interviews & exams!
π Got it? Comment below & donβt forget to like & subscribe for more coding tricks! π―π₯
#JavaCoding #Programming #Substring #InterviewQuestions π
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Video Information
Views
939
Likes
25
Duration
0:18
Published
Mar 17, 2025
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