voidtrimToSize() 尝试减少用于字符序列的存储空间。 声明方法的类 java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait 声明方法的接口 java.lang.CharSequence chars, codePoints, length, t
字符串去重（-XX:+UseStringDeduplication）减少内存占用总结：- `String` 是不可变的字符串类，适用于...
but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. String buffers are safe for use by multiple threads. The methods are synchronized where necessary so...
-XX:+UseCompressedClassPointers 允许类指针压缩。 它们默认都是开启的,可以手动关闭它们。 在VM options中输入 -XX:-UseCompressedOops -XX:-UseCompressedClassPointers 1. 2. 再次运行结果如下 9344 Exception in thread "main" java.lang.OutOfMemoryError: Metaspace 1. 2. 表明元空间内存溢出。 jdk1.6 永...
Note that use of this constructor is * unnecessary since Strings are immutable. */ public String() { this.value = "".value; this.coder = "".coder; } StringBuffer、StringBuilder 在java.lang.AbstractStringBuilder中: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * Creates an ...
/** use serialVersionUID from JDK 1.0.2 for interoperability */ privatestaticfinallongserialVersionUID = -6849794470754667710L; ... } 从上面可以看出几点: 1)String类是final类,也即意味着String类不能被继承,并且它的成员方法都默认为final方法。在Java中,被final修饰的类是不允许被继承的,并且该类中的...
Scanner sc = new Scanner(System.in); System.out.println("请输入一个QQ号码"); String qqNum = sc.nextLine(); //校验QQ号的组成规则 // boolean b = checkQQNum(qqNum); boolean b = checkQQNumUseRegex(qqNum); if (b) { System.out.println("QQ规则正确"); ...
publicfinalclassStringBufferextendsAbstractStringBuilderimplementsjava.io.Serializable, CharSequence {/** * A cache of the last value returned by toString. Cleared * whenever the StringBuffer is modified. */privatetransientchar[] toStringCache;/** use serialVersionUID from JDK 1.0.2 for interoperability...
String buffers are safe for use by multiple threads. The methods are synchronized where necessary so that all the operations on any particular instance behave as if they occur in some serial order that is consistent with the order of the method calls made by each of the individual threads invo...
/** The count is the number of characters in the String. */ private final int count; /** Cache the hash code for the string */ private int hash; // Default to 0 /** use serialVersionUID from JDK 1.0.2 for interoperability */ ...