String creation on heap and constant pool

TL;DR

This video explains the different ways to create strings in Java, including using the String class and string literals, and how they are stored in memory.

Transcript

hello everyone and welcome to the next session of kojal in continuation with strings in this session we will discuss about string creation on and string constant which is also termed as string how we will be creating a string so far we have discussed that okay string is a reference data type internally it is stored in the form of character array st... Read More

Key Insights

• 🏛️ Strings in Java can be created using the String class or string literals.
• 🏪 String literals are stored in the string pool, where duplicate values are not duplicated in memory.
• 👶 When creating a new string literal, JVM checks if the value already exists in the pool before creating a new instance.
• 👶 String objects created using the new keyword are stored in normal heap memory.
• 🎱 Using string literals can save memory by reusing existing instances in the pool.
• ⏫ String literals are created using double quotes.
• 💁 The String class is a reference data type in Java and is stored in the form of a character array.

Questions & Answers

Q: What is the difference between creating a string using the String class and using string literals?

When creating a string using the String class, we assign a value using the constructor. String literals, on the other hand, are created using double quotes and are stored in the string pool.

Q: How are string literals stored in memory?

String literals are stored in the string pool. When creating a new string literal, JVM checks if the value already exists in the pool. If it does, a reference to the existing instance is returned. If not, a new string instance is created and stored in the pool.

Q: Can we create a string object using the new keyword?

Yes, we can create a string object using the new keyword. When we create a string object, it is stored in normal heap memory, not in the string pool.

Q: What happens when we create multiple string literals with the same value?

When multiple string literals with the same value are created, they will all refer to the same location in the string pool. This allows for memory efficiency and avoids duplicate string instances.

Summary & Key Takeaways

• Strings can be created in Java using the String class or string literals.

• String literals are created using double quotes and are stored in the string pool.

• When creating a new string literal, JVM checks if it already exists in the pool and returns a reference if it does.

• String objects created using the new keyword are stored in normal heap memory.