JAVA （StringBuffer/StringBuilder）常用API

Posted 2020-09-26 云上咖啡

 1 public class Copy3 {
 2 
 3     public static void main(String[] args) {
 4         //构造实例化
 5         StringBuffer strbu = new StringBuffer("hello world\\t");
 6         char[] a = {\'l\',\'o\',\'y\',\'o\',\'u\'};
 7         //调用方法
 8         
 9         System.out.println(1+"\\t"+strbu.append(true));            //append(boolean b);
10         System.out.println(2+"\\t"+strbu.append(\'a\'));            //append(char b);
11         System.out.println(3+"\\t"+strbu.append(a));                //append(char[] b);
12         System.out.println(4+"\\t"+strbu.capacity());            //capacity();
13         System.out.println(5+"\\t"+strbu.charAt(10));            //charAt(int index);
14         System.out.println(6+"\\t"+strbu.delete(3, 9));            //delete(int start, int end);
15         System.out.println(7+"\\t"+strbu.insert(5, false));        //insert(int offset, boolean b);
16         System.out.println(8+"\\t"+strbu.substring(7));            //substring(int start)
17         System.out.println(9+"\\t"+strbu.reverse() );            //reverse() 
18         
19     }
20 
21 }

 

运行结果