String s = new String("abc"); s =new String("Java语言"); 只是按照面向对象的标准语法,在内存使用上存在比较大的浪费。如String s = new String(“abc”);实际上创建了两个String对象,一个是”abc”对象,存储在常量空间中,一个是使用new关键字为对象s申请的空间。 2.字符串的常见操作方法 2.
publicclassTest{publicstaticvoidmain(String[] args){StringBuffersb=newStringBuffer("YuZhen Feng");//增sb.append("nb"); System.out.println(sb);//YuZhen Fengnb//删sb.delete(2,6);//删除位置在[2,6)上的字符System.out.println(sb);//Yu Fengnbsb.deleteCharAt(1);//删除位置在1上的字符System...
1.它是引用类型,在堆上分配内存 2.运算时会产生一个新的实例 3.String 对象一旦生成不可改变(Immutable) 4.定义相等运算符(== 和 !=)是为了比较 String 对象的值(而不是引用) String,StringBuilder类之间关系: 乍一看它们都是用于处理字符串的java类,而且长得也都差不多,相信肯定有人会以为StringBuilder都是...
Serializable: Serializability of a class is enabled by the class implementing the java.io.Serializable interface. AbstractStringBuilder: A MUTABLE SEQUENCE of characters. Implements a modifiable string. At any point in time it contains some particular sequence of characters, but the length and content...
🌋 调用 String.intern() 方法可以将这个字符串对象尝试放入串池,如果有则并不会放入,把串池中的对象返回;如果没有则放入串池, 再把串池中的对象返回。 注意这里说的返回是指调用 String.intern() 方法后返回的值。比如 String ss = s.intern() , ss 接收返回的对象,与 s 无关。而 s 只与对象本身有...
StringBuilder是可变字符串,和String的主要区别是他的字符串是可变的,例如拼接等操作不会重返回新的StringBuilder实例。 public final class StringBuilder extends AbstractStringBuilder implements java.io.Serializable, CharSequence{} 1. 2. 3. StringBuilder继承了AbstractStringBuilder并且实现了Serializable和CharSequence。
(1)String String的构造函数(几个常见的构造函数) publicString() {this.offset = 0;this.count = 0;this.value =newchar[0]; }/*** Initializes a newly created {@codeString} object so that it represents * the same sequence of characters as the argument; in other words, the ...
StringBuilder public StringBuilder(String str) 构造一个初始化为指定字符串内容的字符串构建器。 字符串生成器的初始容量为16加上字符串参数的长度。 参数 str - 缓冲区的初始内容。 StringBuilder public StringBuilder(CharSequence seq) 构造一个字符串构建器,其中包含与指定的CharSequence相同的字符。
StringtoString() Returns a string representing the data in this sequence. voidtrimToSize() Attempts to reduce storage used for the character sequence. Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait Methods inherited fr...
Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. See also <xref:Java.Lang.StringBuilder.LastIndexOf(System.String%2c+System.Int32)> ...