In java, after the String type string s is assigned null, the String is spliced with other strings to obtain the style of the null string connected to other characters. The String value is null.

Source: Internet
Author: User

In java, after the String type string s is assigned null, the String is spliced with other strings to obtain the style of the null string connected to other characters. The String value is null.

String s = null;

S + = "hello ";

System. out. println (s );

The result is: nullhello.

Cause:

Use String. valueOf to obtain the value of s and then concatenate hello through StringBuilder. Therefore, the value and hello are spliced;

String s = null;
S = (new StringBuilder (String. valueOf (s). append ("hello"). toString ();
System. out. println (s );

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