Difference between string STR and string STR = new string ("")

1. When string STR = "ABC" is used, check whether the string "ABC" exists in the heap of the memory. If yes, reference the address. If it does not exist, it is created.

 

2. When string STR = new string ("ABC"); is used, a new object is created no matter whether "ABC" exists in advance.

 

Test:

String S1 = "ABC ";
String S2 = "ABC ";
String S3 = new string ("ABC ");

String S4 = new string ("ABC ");

 

System. Out. println (S1 = S2 );
System. Out. println (s2 = S3 );

 

System. Out. println (S1 = S3 );

System. Out. println (S4 = S3 );

The output is as follows:

True
False
False

False

 

Why?

Refer to the above two points to see that S1 and S2 reference the same address, so it is true.

S3 creates a new "ABC" object, so it is false.

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