129_StringBuilder 添加和反转
1 package StringBuilder; 2 /* 3 StringBuilder的添加和反转方法 4 public StringBuilder append(任意类型):添加数据,并返回对象本身 5 public StringBuilder reverse():返回相反的字符序列 6 */ 7 public class StringBuilderDemo02 { 8 public static void main(String[] args) { 9 //创建对象 10 StringBuilder sb = new StringBuilder(); 11 12 // public StringBuilder append(任意类型):添加数据,并返回对象本身 13 StringBuilder sb1 = sb.append("HelloWorld"); 14 15 // System.out.println("sb:"+sb); 16 // System.out.println("sb1:"+sb1); 17 // System.out.println(sb==sb1); 18 19 // sb.append("hello"); 20 // sb.append("world"); 21 // sb.append(100); 22 // 23 // System.out.println("sb:"+sb); 24 25 //链式编程 26 sb.append("hello").append("world").append(986); 27 System.out.println("sb:"+sb); 28 29 //public StringBuilder reverse():返回相反的字符序列 30 sb.reverse(); 31 System.out.println("sb:"+sb); 32 33 } 34 }