StringBuffer的一些方法

package test;


import java.util.*;

import javax.security.auth.kerberos.KerberosKey;

import java.io.*;
import java.math.BigInteger;


public class Main {

	private static final String space_operator = " ";
	public static void main(String[] args) throws Exception {

		Scanner scanner = new Scanner(new BufferedInputStream(System.in));
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		
		StringBuffer sb = new StringBuffer();
		
		//StringBuffer是一个缓冲区，开始的时候有16个字节
		//append可以添加一些东西放进尾部boolean，int double等
		sb.append("ads");
		sb.append(4);
		System.out.println(sb);
		
		//在指定位置插入一些东西
		sb.insert(1, true);
		System.out.println(sb);
		
		//删除del
		sb.delete(1, 3);
		System.out.println(sb);
		
		//查找
		/*
		 * indexof,
		 * charat
		 * lastindexof等等
		 */
		
		//替换，不过StringBuffer的替换函数不一样，它能告诉开头结尾替换
		sb.replace(1, 3, "臭猪臭猪");
		System.out.println(sb);
		sb.setCharAt(2, ‘s‘);
		System.out.println(sb);
		
		//一些有趣的操作
		//设置长度
		sb.setLength(10);
		System.out.println(sb);
		
		
	}


	
}