Java 中 String 是 immutable(不可变)的。 String 类的包含如下定义: /** The value is used for character storage. */privatefinalcharvalue[];/** The offset is the first index of the storage that is used. */privatefinalintof
String是Java中基础且重要的类,并且String也是Immutable类的典型实现,被声明为final class,除了hash这个属性其它属性都声明为final,因为它的不可变性,所以例如拼接字符串时候会产生很多无用的中间对象,如果频繁的进行这样的操作对性能有所影响。 StringBuffer就是为了解决大量拼接字符串时产生很多中间对象问题而提供的一个...
publicfinalclassStringimplementsjava.io.Serializable,Comparable<String>,CharSequence{/** The value is used for character storage. */privatefinal char value[];/** The offset is the first index of the storage that is used. */privatefinal int offset;/** The count is the number of characters i...
在 Java 平台类库中，包含许多不可变类，例如String, 基本类型的包装类，BigInteger,BigDecimal等等。综上...
implementsjava.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character storage. */ privatefinalcharvalue[]; /** The offset is the first index of the storage that is used. */ privatefinalintoffset; /** The count is the number of characters in the String....
publicfinalclassStringimplementsjava.io.Serializable, Comparable<String>, CharSequence {/**The value is used for character storage.*/privatefinalcharvalue[];/**Cache the hash code for the string*/privateinthash;//Default to 0/**use serialVersionUID from JDK 1.0.2 for interoperability*/privatesta...
1、java的内存区 众所周知,java程序是运行在java虚拟机(Java Virtual Machine即JVM)上的,而JVM中有一个专门负责给java程序分配内存的区域,叫运行时数据区(Java Memory Allocation Area),也叫虚拟机内存或者java内存.为了不使内存数据杂乱无章,java内存通常被分为5个区域:程序计数器、本地方法栈、方法区、栈、堆...
String作为Java中使用最为广泛的一个类，之所以设计为不可变，主要是出于效率与安全性方面考虑。这种设计...
(sixteen bits) for each character. Data gathered from many different applications indicates that strings are a major component of heap usage and, moreover, that most String objects contain only Latin-1 characters. Such characters require only one byte of storage, hence half of the space in the...
publicfinalclassStringimplementsjava.io.Serializable,Comparable<String>,CharSequence{/** The value is used for character storage. */privatefinalcharvalue[];/** The offset is the first index of the storage that is used. */privatefinalintoffset;/** The count is the number of characters in the...