"Java Heavy Difficulty Knowledge" string S=new string ("abc") and string= "ABC"; Difference

First, String s=new string ("abc"); The sentence creates 2 objects;

One instance object for new and the other is "ABC";

S is not an object, S is just a reference (a pointer in C + +).

To query the constructor of the string class in Java, there is one such constructor with the following API:

Public (original)

• Initializes a newly created String object to represent a sequence of characters that are the same as the argument; in other words, the newly created string is a copy of the parameter string. Because the String is immutable, you do not need to use this construction method unless you want original an explicit copy.

  • Parameters:

  • original-A String .

The string s= "abc" apparently created only one object.

String s= "A" + "B"; This sentence creates 3 objects, "a" "B" and "AB"

Secondly, the difference between the two is as follows:

String S=new string ("abc"); The resulting object will not be in the JVM (Java Virtual machine) Chang (precompiled)

and the latter is. (Note: The String class is a final type and the String class object cannot be modified.)

Reference: http://www.cnblogs.com/ydpvictor/archive/2012/09/09/2677260.html

"Java Heavy Difficulty Knowledge" string S=new string ("abc") and string= "ABC"; Difference