# java 8
public final class String
implements java.io.Serializable, Comparable<String>, CharSequence {
/** The value is used for character storage. */
private final char value[];
# java 10
public final class String
implements java.io.Serializable, Comparable<String>, CharSequence {
/**
* The value is used for character storage.
*
* @implNote This field is trusted by the VM, and is a subject to
* constant folding if String instance is constant. Overwriting this
* field after construction will cause problems.
*
* Additionally, it is marked with {@link Stable} to trust the contents
* of the array. No other facility in JDK provides this functionality (yet).
* {@link Stable} is safe here, because value is never null.
*/
@Stable
private final byte[] value;
ps: 不知道哪个版本变的,没去看 java 9
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