黑马程序员——StringBuffer的方法概览

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package stringbuffer;

public class StringBuffer_1 {
	public static void main(String[] args) {
		StringBuffer sb=new StringBuffer();
		add(sb);
		System.out.println("------------------------------");
		getChars(sb);
		System.out.println("------------------------------");
		get(sb);
		System.out.println("------------------------------");
		reverse(sb);
		System.out.println("------------------------------");
		replace(sb);
		System.out.println("------------------------------");
		delete(sb);
	}
	//将sb中的数据按指定角标位存入字符数组按角标位存
	public static void getChars(StringBuffer sb){
		char[] c=new char[5];
		sb.getChars(2, 5,c, 2);
		for (int i = 0; i < c.length; i++) {
			System.out.println("c["+i+"]="+c[i]+";");
		}
	} 
	//反转
	public static void reverse(StringBuffer sb){
		System.out.println(sb.reverse());
	}
	//修改，替换
	public static void replace(StringBuffer sb){
		System.out.println(sb.replace(3,8,"abc"));//指定要替换的首尾角标，替换成指定字符串
		sb.setCharAt(3,'q');//指定角标替换字符
		System.out.println(sb);
	}
	//获取
	public static void get(StringBuffer sb){
		System.out.println(sb.charAt(3));
		System.out.println(sb.indexOf("true"));
		System.out.println(sb.indexOf("f",11));//从指定角标开始获取指定字符串角标
	}
	//存储
	public static void add(StringBuffer sb){
		sb.append(33).append(true).append("ffdsa");
		System.out.println(sb);
		sb.insert(2,false);
		System.out.println(sb);
		
	}
	//删除
	public static void delete(StringBuffer sb){
		sb.append("fdafdsa");
		System.out.println(sb.delete(2, 5));//删除指定区域角标元素
		System.out.println(sb.deleteCharAt(2));//删除指定角标元素
		System.out.println("清空缓冲区："+sb.delete(0,sb.length()));//清空缓冲区
	}
}

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