initially empty, is maintained privately by the * class {@code String}. * * When the intern method is invoked, if the pool already contains a * string equal to this {@code String} object as determined by * the {@link #equals(Object)} method...
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,...
When the intern method is invoked, if the pool already contains a string equal to thisStringobject as determined by the {@link #equals(Object)} method, then the string from the pool is returned. Otherwise, thisStringobject is added to the pool and a reference to thisStringobject is returne...
* When the intern method is invoked, if the pool already contains a * string equal to this {@codeString} object as determined by * the {@link#equals(Object)} method, then the string from the pool is * returned. Otherwise, this {@codeString} object is added to the * pool and a re...
1,JAVA 代码 /** * Returns a canonical representation for the string object. ** 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 thisString...
* class {@code String}. * * When the intern method is invoked, if the pool already contains a * string equal to this {@code String} object as determined by * the {@link #equals(Object)} method, then the string from the pool is * returned...
* class String. * * When the intern method is invoked, if the pool already contains a * string equal to this String object as determined by * the {@link #equals(Object)} method, then the string from the pool is * returned. Otherwise, this String ...
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...
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...
* When the intern method is invoked, if the pool already contains a * string equal to this {@codeString} object as determined by * the {@link#equals(Object)} method, then the string from the pool is * returned. Otherwise, this {@codeString} object is added to the ...