difference between string literal and string object_difference between string and string literal in py-优快云博客

本文详细解析了Java中使用new关键字与字符串字面量创建String对象的区别，介绍了String对象如何存储于堆内存及字符串常量池中，并通过实例演示了不同创建方式下String对象的引用情况。

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new String("text"); explicitly creates a new and referentially distinct instance of a String object;

String s = "text"; may reuse an instance from the string constant pool if one is available.

You very rarely would ever want to use the new String(anotherString) constructor.

From the API:

String(String original) : Initializes a newly created String object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string. Unless an explicit copy of original is needed, use of this constructor is unnecessary since strings are immutable.

Whenever you call new in JAVA it create an object in heap and obviously it will call the constructor also.

String literals will go into String Constant Pool.
It might help you to understand it visually to remember it for longer time.

Whenever you call new in JAVA it create an object in heap and obviously it will call the constructor also.

String literals will go into String Constant Pool.

It might help you to understand it visually to remember it for longer time.

Object creation line by line:

String str1 = new String("java5");

Using string literal "java5" in the constructor, an new string value is stored in string constant pool
Using new operator a new string object is created in the heap with "java5" as value

String str2 = "java5

Reference str2 is pointed to already stored value in string constant pool

String str3 = new String(str2);

A new string object is created in the heap with the same value as reference by str2

String str4 = "java5";

Reference str4 is pointed to already stored value in string constant pool

Total objects : Heap[堆] - 2, Constant Pool[常量池] - 1

Whenever you call new in JAVA it create an object in heap and obviously it will call the constructor also.

String literals will go into String Constant Pool.

It might help you to understand it visually to remember it for longer time.

enter image description here

Object creation line by line:

String str1 = new String("java5");
- Using string literal "java5" in the constructor, an new string value is stored in string constant pool
- Using new operator a new string object is created in the heap with "java5" as value
String str2 = "java5
- Reference str2 is pointed to already stored value in string constant pool
String str3 = new String(str2);
- A new string object is created in the heap with the same value as reference by str2
String str4 = "java5";
- Reference str4 is pointed to already stored value in string constant pool