Java 字符串 之 字符串StringBuffer

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/** 知识点: 可变字符串对象 StringBuffer 1. 什么是StringBuffer 2. 为什么用StringBuffer 一般用在很多字符串相连接的情况 3. StringBuffer的操作和应用 */ public class TestStringBuffer { public static void main(String[] args) { String str = ""; //实例化一个空的字符缓冲区 StringBuffer strBuffer = new StringBuffer(); for (int i = 0; i < 100; i++) { str += i + ","; strBuffer.append(i).append(","); } //输出字符缓冲区的字符串 System.out.println(strBuffer.toString()); //1. 字符串追加 StringBuffer buffer = new StringBuffer(); buffer.append("How"); buffer.append(" your"); //2. 字符串的输出 System.out.println(buffer.toString()); //3. 字符串的替换 buffer.replace(4, 9, "you"); System.out.println(buffer.toString()); //4. 字符串插入索引为3的后面 buffer.insert(3, " are"); System.out.println(buffer.toString()); //5. 字符串的截取 System.out.println(buffer.substring(0, 4)); } } 

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