In java, after assigning the value of String type string s to null, the result obtained after concatenating the string with other strings is the pattern of concatenating the null string with other characters.

String s = null;

s += "hello";

System.out.println(s);

The result is: nullhello

reason:

First apply String.valueOf to get the value of s, and then use StringBuilder to splice hello, so 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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