Java String Learning Notes

The following relationships are found in Java strings by looking at the JDK source code:

The methods in the interface are abstract by default and can be written or not written.

Public interface Charsequence {        int length ();       char charAt (int index);        Charsequence subsequence (int start, int end);     Public String toString ();}

The other is the implementation class of the interface and the final class, which cannot be inherited.

Public final class String    implements Java.io.Serializable, Comparable<string>, charsequence

<span style= "color: #ff0000;" >StringBuffe</span>

thread safety. However, there is a synchronous object lock, so performance degrades.

Public final class StringBuffer    extends Abstractstringbuilder    implements Java.io.Serializable, Charsequence

StringBuilder threads are not secure, but are highly efficient in a single-threaded environment.

Public final class StringBuilder    extends Abstractstringbuilder    implements Java.io.Serializable, Charsequence

Java String Learning Notes