java7 的String.intern() java7中,String.intern()方法做了重要的改变。 首先,字符串池的存储位置从永久带(java8中,方法区(Method area)取代了永久带(PermGen)) 挪到了堆。这样带来了两个重要的影响 1. 字符串常量池中的对象可以被GC 2. 字符串常量池的大小不再受永久带内存大小限制(在jdk6中,永久带的大...
string);jchar*chars=java_lang_String::as_unicode_string(string,length,CHECK_NULL);oop result=intern(h_string,chars,length,CHECK_NULL);returnresult;}...oop StringTable::intern(Handle string_or_null_h,jchar*name,int len,TRAPS){...unsigned int hash=java_lang_String::hash_code(...
它的大体实现结构就是:JAVA 使用 jni 调用c++实现的StringTable的intern方法,StringTable的intern方法跟Java中的HashMap的实现是差不多的, 只是不能自动扩容。默认大小是1009。要注意的是,String的String Pool是一个固定大小的Hashtable,默认值大小长度是1009,如果放进String Pool的String非常多,就会造成Hash冲突严重,...
if the pool already contains a string equal to this String object as determined by the equals(Object) method, then the string from the pool is returned. Otherwise, this String object is added to the pool
String.Intern MethodReference Feedback 本文内容 Definition Remarks Applies to DefinitionNamespace: Java.Lang Assembly: Mono.Android.dll Returns a canonical representation for the string object. [Android.Runtime.Register("intern", "()Ljava/lang/String;", "")] public string Intern (); Returns...
1,直接使用双引号声明出来的String对象会直接存储在常量池中。 2,使用new String(“xxxx”)来初始化。 两者的区别是直接声明的String对象是声明在常量池中的;而new初始化的对象是放在Java堆中的。 以下例子来说明问题: 代码1: static void test1(){
A pool of strings, initially empty, is maintained privately by the classString. When the intern method is invoked, if the pool already contains a string equal to thisStringobject as determined by the#equals(Object)method, then the string from the pool is returned. Otherwise, thisStringobject ...
object as determined by * the {@link #equals(Object)} method, then the string from the...
A pool of strings, initially empty, is maintained privately by the class String. When the intern method is invoked, if the pool already contains a string equal to this String object as determined by the #equals(Object) method, then the string from the pool is returned. Otherwise, this Stri...
两个new String相加会被优化为StringBuilder，可以通过javac和javap查看汇编指令如下：javac InternTest.javajavap -c InternTest publicclasscom.justin.java.lang.InternTest{ publiccom.justin.java.lang.InternTest();Code:: aload_0 1: invokespecial #1// Method java/lang/Object."<init>":()V4:return...