publicvoidtrimToSize() Example In the following code shows how to use StringBuffer.trimToSize() method. It trims the unused spaces and checks the length and capacity again. publicclassMain {publicstaticvoidmain(String[] argv) { StringBuffer sb =newStringBuffer(); sb.append("java2s.com");//...
publicString toString() Example In the following code shows how to use StringBuffer.toString() method. publicclassMain {publicstaticvoidmain(String[] argv) { StringBuffer sb =newStringBuffer(); sb.append("java2s.com"); System.out.println(sb.toString());/*www.java2s.com*/} } The output...
所以多数情况下推荐使用 StringBuffer ,特别是字符串对象经常改变的情况下。 在某些特别情况下, String 对象的字符串拼接其实是被 Java Compiler 编译成了 StringBuffer 对象的拼接,所以这些时候 String 对象的速度并不会比 StringBuffer 对象慢,例如: 1. String s1 = “This is only a” + “ simple” + “ ...
int lastIndexOf(String searchKey, int fromIndex) StringBuilderDemo.java package com.yiibai.tutorial.strbb; public class StringBuilderDemo { public static void main(String[] args) { // Create StringBuilder object // with no characters in it and // an initial capacity specified by the capacity a...
StringBuilder (introduced in Java 5) is identical to StringBuffer, except its methods are not synchronized. This means it has better performance than the latter, but the drawback is that it is not thread-safe. Read tutorial for more details. Share Improve this answer Follow edited Jan 14,...
JavaSE 常用类(String类的常用方法) String类的常用方法一: 1.int length(): 返回字符串长度; 2.charcharAt(int index): 返回某索引处的字符 3.boolean isEmpty(): 判断...字符串中最后一次出现的位置String类的常用方法三:一:替换:1.Stringreplease(charoldChar,charnewChar): 返回一个新的字符串,它是通...
OutputInitial Content: IncludeHelp After Appending: IncludeHelp Java Tutorial! After Insertion: Inclu JavadeHelp Java Tutorial! After Deletion: IncludeHelp Java Tutorial! After Reversal: !lairotuT avaJ pleHedulcnI Convert Character Array to String in Java Java toString() Method ...
Java.lang.StringBuffer.insert() Method - The java.lang.StringBuffer.insert(int offset, Object obj) method inserts the string representation of the Object argument into this sequence.The offset argument must be greater than or equal to 0, and less than or
一、String String 字符串常量:在java中字符串属于对象,java中提供了String类来创建和操作字符串; String的值是不可变的,这就导致每次对String的操作都会产生出一个新的对象,这样会导致效率低下,并且浪费资源空间;一旦栈内存中的对象没有了,栈内存中的空间会马上被释放出来,但是堆内存中... ...
import java.util.GregorianCalendar; public class TestString { public static void main(String[] args) { System.gc(); long start=new GregorianCalendar().getTimeInMillis(); long startMemory=Runtime.getRuntime().freeMemory(); StringBuffer sb = new StringBuffer(); ...