在Java中如何通过字符串分配内存? [英] How is memory alocated with Strings in Java?

问题描述

具有以下代码:

String s="JAVA";
for(i=0; i<=100; i++)
     s=s+"JVM";

创建了多少个字符串?我的猜测是创建了103个字符串:

How many Strings are created? My guess is that 103 Strings are created:

1:字符串池中的字符串"JAVA"

1: the String "JAVA" in the String pool

1:字符串池中也有字符串"JVM"

1: the String "JVM" also in the String pool

101:因为该字符串是一个不可变的类，所以每次在循环中都会创建新的字符串s

101: the new String s is created every time in the loop because the String is an Immutable class

推荐答案

字符串连接是通过StringBuilder(或StringBuffer)类及其append方法实现的.字符串转换通过方法toString实现，该方法由Object定义并由Java中的所有类继承.有关字符串连接和转换的其他信息，请参见Java语言规范 Gosling，Joy和Steele.

String concatenation is implemented through the StringBuilder(or StringBuffer) class and its append method. String conversions are implemented through the method toString, defined by Object and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, The Java Language Specification.

在您的情况下，将创建103个字符串，循环中每个字符串一个，两个字符串Java和JVM.

In your case, 103 strings are created, one for each in the loop and the two Strings Java and JVM.

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