在JDK6及之前版本,字符串常量池是放在Perm Gen区(也就是方法区)中的,StringTable的长度是固定的1009;在JDK7版本中,字符串常量池被移到了堆中,StringTable的长度可以通过-XX:StringTableSize=66666参数指定。至于JDK7为什么把常量池移动到堆上实现,原因可能是由于方法区的内存空间太小且不方便扩展,而堆的内存空间...
locals=1,args_size=10:aload_01:invokespecial #1// Method java/lang/Object."<init>":()V4:returnLineNumberTable:line7:0LocalVariableTable:Start Length Slot Name Signature050thisLcom/dmz/jvm/Main;publicstaticvoidmain(java.lang.String[]);descriptor:([Ljava/lang/String...
0:ldc#2 // String abc2:astore_13:aload_14:astore_25:getstatic#3 // Field java/lang/System.out:Ljava/io/PrintStream;8:aload_19:aload_210:if_acmpne1713:iconst_114:goto1817:iconst_018:invokevirtual#4 // Method java/io/PrintStream.println:(Z)V21:ldc#2 // String abc23:astore_1 在21行...
public class StringAsParamOfMethodDemo { public static void main(String[] args) { StringAsParamOfMethodDemo StringAsParamOfMethodDemo = new StringAsParamOfMethodDemo(); StringAsParamOfMethodDemo.testA(); } private void testA() { String originalStr = "original"; System.out.println("Test A B...
在Java中,我们可以进行: public class Hello { public static void main(String[] args) { String a="hello"; System.out.println(a); } } 1. 2. 3. 4. 5. 6. 7. 8. 上面代码,在Hello.java 的头文件中能够正常运行,但是,在Java中没有指针,因此拿不到地址!!
* @return a string representation of the argument in base 10.//返回:以10为基数的参数的字符串表示形式。 */ @IntrinsicCandidate public static String toString(int i) { int size = stringSize(i); if (COMPACT_STRINGS) { byte[] buf = new byte[size]; ...
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...
For additional information on string concatenation and conversion, see The Java™ Language Specification. Unless otherwise noted, passing a null argument to a constructor or method in this class will cause a NullPointerException to be thrown. A String represents a string in the UTF-16 format...
Exceptioninthread"main"java.lang.OutOfMemoryError:PermGenspaceatjava.lang.String.intern(NativeMethod)...
java string 和 long内存对比 java中string和int的区别 一、 int与Integer的基本使用对比 (1)Integer是int的包装类;int是基本数据类型; (2)Integer变量必须实例化后才能使用;int变量不需要; (3)Integer实际是对象的引用,指向此new的Integer对象;int是直接存储数据值 ;...