String Objects: Concatenation, Literals, and More

AP Computer Science A· difficulty 4/5

In Java, <code> String </code> objects are

A
$Immutable (operations return new strings; original unchanged)$
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B
$Synchronized$
C
$Always null$
D
$Mutable (can be modified in place)$

Explanation

<code> s.toUpperCase() </code> returns a new string; <code> s </code> itself is unchanged.

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