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