AI代码解释 //StringBufferlong startTime=System.currentTimeMillis();StringBuffer str=newStringBuffer();for(int i=0;i<500000;i++){str.append(i);}long endTime=System.currentTimeMillis();System.out.println("StringBuffer类型操作耗时"+(endTime-startTime)+"毫秒");//StringBuilderlong startTime=Sys...
常用API StringBufferappend(boolean b)(char c)(char[] str) (CharSequence s) (String str) intcapacity() charcharAt(int index) StringBufferdelete(int start, int end) StringBufferdeleteCharAt(int index) voidensureCapacity(int minimumCapacity)//Ensures that the capacity is at least equal to the s...
StringBuffer的常用方法 1packagecom.atfu.java01;23importorg.junit.Test;45/**6*7*8*@authorfu jingchao9* @creat 2021/10/31-15:0310*/11publicclassStringBufferTest {1213/*14StringBuffer的常用方法:15StringBuffer append(xxx):提供了很多的append()方法,用于字符串的拼接16StringBuffer delete(int sta...
2. StringBuildersb=newStringBuilder("Hello");sb.append(" World!");// 结果:Hello World! 1. 2. 1.2 insert 方法 insert方法用于在指定位置插入新的字符串。 StringBuffersb=newStringBuffer("Hello World");sb.insert(5," at ");// 结果:Hello at World 1. 2. StringBuildersb=newStringBuilder("Hell...
StringBuffer append(data):在缓冲区中追加数据。追加到尾部。 StringBuffer insert(index,data):在指定位置插入数据。 2,删除。 StringBuffer delete(start,end);删除从start至end-1范围的元素 StringBuffer deleteCharAt(index);删除指定位置的元素 //sb.delete(0,sb.length());//清空缓冲区。
public StringBuffer append(boolean b) 1. 该方法的作用是追加内容到当前StringBuffer对象的末尾,类似于字符串的连接。调用该方法以后,StringBuffer对象的内容也发生改变,例如: StringBuffer sb = new StringBuffer(“abc”); sb.append(true); 1. 2. ...
{stringBuilder.append(i);}System.out.println("执行"+count+"次 StringBuilder 耗时:"+getRunTime(startTime));startTime=System.currentTimeMillis();StringBuffer stringBuffer=newStringBuffer("");for(int i=0;i<count;i++){stringBuffer.append(i);}System.out.println("执行"+count+"次 StringBuffer ...
Append(ICharSequence, Int32, Int32) Added in 1. C# 複製 [Android.Runtime.Register("append", "(Ljava/lang/CharSequence;II)Ljava/lang/StringBuffer;", "")] public override Java.Lang.IAppendable Append(Java.Lang.ICharSequence? s, int start, int end); Parameters s ICharSequence the ...
若一个字符串经常改变,则用stringbuffer,引用地址不变 拼接内容:append(str) 任意位置添加内容:insert(index,str) 字符串反转:reverse() 对指定范围内容替换:replace(start,end,str) 字符串截取:substring(start,end) 删除指定范围内容:de... 查看原文 StringBuffer构造方法和方法的介绍和案例演示 append(String ...
public String substring(int start, int end):返回一个从start开始到end索引结束的左闭右开区间的子字符串 public int length() public char charAt(int n) public void setCharAt(int n, char ch) 总结: 增:append(xxx) 删:delete(int start, int end) ...