String In Java | String Advanced Concepts | What Is Heap Memory And String Constant Pool (SCP)

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In This video, we will discuss string in java
Definition :
Generally, String is a sequence of characters. But in Java, string is an object that represents a sequence of characters. The java.lang.String class is used to create a string object.

How to create a string object?
There are two ways to create a String object:

1.By string literal
2.By new keyword

Example:

String s ="hello";
Each time you create a string literal, the JVM checks the "string constant pool" first. If the string already exists in the pool, a reference to the pooled instance is returned. If the string doesn't exist in the pool, a new string instance is created and placed in the pool.

String s=new String("Welcome");

In such case, JVM will create a new string object in normal (non-pool) heap memory, and the literal "Welcome" will be placed in the string constant pool. The variable s will refer to the object in a heap (non-pool).