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...
13. //使用/不使用intern方法为10万个String赋值,值来自于Integer数组的10个数 14. for (int i = 0; i < MAX; i++) { 15. new String(String.valueOf(sample[i % sample.length])); 16. //arr[i] = new String(String.valueOf(sample[i % sample.length])).intern(); 17. } 18. "ms"...
从运行结果来看,不使用intern()的情况下,程序生成了101762个String对象,而使用了intern()方法时,程序仅生成了1772个String对象。自然也证明了intern()节省内存的结论。 细心的同学会发现使用了intern()方法后程序运行时间有所增加。这是因为程序中每次都是用了new String后又进行intern()操作的耗时时间,但是不使用inte...
浅谈Java String.intern() String.intern()原理 String.intern()是一个Native方法,底层调用C++的 StringTable::intern 方法,源码注释:当调用 intern 方法时,如果常量池中已经该字符串,则返回池中的字符串;否则将此字符串添加到常量池中,并返回字符串的引用。 class Test { public static void main...
1.Java代码# /*** Returns a canonical representation for the string object. * * A pool of strings, initially empty, is maintained privately by the * class {@codeString}. * * When the intern method is invoked, if the pool already contains a * string ...
publicclasscom.justin.java.lang.InternTest{ publiccom.justin.java.lang.InternTest();Code:: aload_0 1: invokespecial #1// Method java/lang/Object."<init>":()V4:returnpublicstaticvoidmain(java.lang.String[]);Code::new #2// class java/lang/StringBuilder3: dup 4: invokespecial #3...
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 is added to the pool and a reference to thisStringobject is returned. ...
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 is added to the pool and a reference to thisStringobject is returned. ...
2.String的 intern 方法到底干了什么? 如果常量池中已经有了这个字符串,那么直接返回常量池中它的引用,如果没有,那就将它的引用保存一份到字符串常量池,然后直接返回这个引用。 3.s1.intern(); 和 s1 = s1.intern();一样吗? 不一样。 s1.intern(); 将s1的引用保存一份到字符串常量池。如果常量池中...
本地方法栈:虚拟机栈是为执行Java方法服务的,而本地方法栈则是为执行本地方法(Native Method)服务的。在JVM规范中,并没有对本地方法栈的具体实现方法以及数据结构作强制规定,虚拟机可以自由实现它。在HotSopt虚拟机中直接就把本地方法栈和虚拟机栈合二为一。