StringBuffer操作

编程技术  /  houtizong 发布于 3年前   72

package dao;public class Strbuff {public static void main(String[] args){StringBuffer sb1 = new StringBuffer();System.out.println(sb1.capacity());System.out.println(sb1.length());System.out.println();StringBuffer sb2 = new StringBuffer(100);System.out.println(sb2.capacity());sb2.ensureCapacity(400);System.out.println(sb2.capacity());System.out.println();System.out.println(sb2.length());StringBuffer sb3 = new StringBuffer("my english is ");sb3.append("revy good!");System.out.println(sb3);StringBuffer sb4 = new StringBuffer("my english is ");sb4.append("revy good!");sb4.setLength(10);System.out.println(sb4);StringBuffer sb5 = new StringBuffer("my english is ");sb5.append("revy good!");sb5.setCharAt(0,'M');System.out.println(sb5);StringBuffer sb6 = new StringBuffer("my english is ");sb6.append("revy good!");sb6.insert(0,"congratuions !");System.out.println(sb6);StringBuffer sb7 = new StringBuffer("my english is ");sb7.append("revy good!");System.out.println(sb7.substring(10));System.out.println(sb7.substring(10,15));System.out.println(sb7.reverse());}}

结果：

1601004000my english is revy good!my englishMy english is revy good!congratuions !my english is revy good! is revy good! is r!doog yver si hsilgne ym