System.out.println("String耗时: "+ (endTime - startTime) +"ms");// 测试StringBufferstartTime = System.currentTimeMillis();StringBufferstringBuffer=newStringBuffer();for(inti=0; i < count; i++) { stringBuffer.append
StringBuffer可以创建一个动态的String,而不是一个常量。 1packagecom.li;23publicclassStringBufferTest4{5publicstaticvoidmain(String[] args)6{7StringBuffer buffer =newStringBuffer();89buffer.append("hello").append(" world").append(" welcome").append(100).append(false);10String result =buffer.toS...
publicclassMain{publicstaticvoidmain(String[] args){/*1*/String string = "a" + "b" + "c";/*2*/StringBuffer stringBuffer =newStringBuffer(); stringBuffer.append("a"); stringBuffer.append("b"); stringBuffer.append("c"); string =stringBuffer.toString(); } } 当时大部分的新手猿友都...
StringBuffer Attributes RegisterAttribute Remarks A thread-safe, mutable sequence of characters. A string buffer is like aString, 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...
publicclassDemo02{publicstaticvoidmain(String[] args){StringBuffer sb =newStringBuffer();String user ="yyg";String pwd ="123";//实现SQL语句的拼接 sb.append("select * from userInfo where username=").append(user).append(" and pwd=").append(pwd);System.out.println("sql="+sb.toString()...
String、StringBuffer与StringBuilder String概览 在Java中,所有类似“ABCabc”的字面值,都是String的实例;String类位于java.lang包下,是Java语言的核心类,提供了字符串的比较、查找、截取、大小写转换等操作;Java语言为“+”连接符以及对象转换为字符串提供了特殊支持,字符串对象可以使用“+”连接其他对象。String的部分...
public class Demo01 { public static void main(String[] args) { //创建StringBuffer对象 StringBuffer sb = new StringBuffer("跟一一哥,"); //在字符串后面追加新的字符串 sb.append("学Java!"); System.out.println(sb); //删除指定位置上的字符串,从指定的下标开始和结束,下标从0开始 ...
【示例】StringBuffer/StringBuilder基本用法 public class TestStringBufferAndBuilder 1{ public static void main(String[] args) { /**StringBuilder*/ StringBuilder sb = new StringBuilder(); for (int i = 0; i < 7; i++) { sb.append((char) ('a' + i));//追加单个字符 ...
这样对象sb的值就是字符串“select * from userInfo where username=test and pwd=123”。 b、delete方法 public StringBuffer delete(int start, int end) 此方法返回此对象 eg: import java.lang.*; public class StringBufferDemo { public static void main(String[] args) { ...
StringBuffer Class Reference Feedback Definition Namespace: Java.Lang Assembly: Mono.Android.dll A thread-safe, mutable sequence of characters. C# 複製 [Android.Runtime.Register("java/lang/StringBuffer", DoNotGenerateAcw=true)] public sealed class StringBuffer : Java.Lang.AbstractStringBuilder...