15-StringBuffer-10-常用对象API(StringBuffer类-插入&删除&查找&修改)

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package cn.itcast.stringbuffer.demo;public class StringBufferDemo2 {public static void main(String[] args) {/* * StringBuffer的删除操作： * StringBuffer delete(start,end)//包含头，不包含尾，其实是删除角标从start到end-1的元素 * StringBuffer delete(int index)//删除指定位置的元素 *  * StringBuffer的替换操作 * StringBuffer replace(int start,int end,String str)//将角标从start到end-1位置所有字符串一起替换为str * void setCharAt(int start,char ch)//将start位置的原内容替换为字符ch *  * 增删改查C(create)U(update)R(read)D(delete) *///stringBufferDemo_2();//stringBufferDemo_3();stringBufferDemo_4();}private static void stringBufferDemo_4() {StringBuffer sb = new StringBuffer("abcd");sb.setLength(10);System.out.println("sb:"+sb);}private static void stringBufferDemo_3() {StringBuffer sb = new StringBuffer("abcd");//sb.replace(1, 3, "nba");sb.setCharAt(2, 'q');System.out.println(sb);}private static void stringBufferDemo_2() {StringBuffer sb = new StringBuffer("abcd");//sb.delete(1, 3);//sop（sb）输出ad//清空缓冲区sb.delete(0, sb.length());//有一个盆，揉了半天面，把面倒掉，但是盆还在，故这方法删除之后缓冲区sb还在//StringBuffer sb = new StringBuffer();//有一个盆，揉了半天面，把面和盆一起扔了，买个新盆，这方法不靠谱System.out.println(sb);}}

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