stringbuffermethods.java

《A first book of java》by Gary J.Bronson 北大出版社

import java.io.*;
public class StringBufferMethods
{
  public static void main (String[] args) 
  {
    
    StringBuffer str = new StringBuffer("This cannot be");
    int i, numChars;

    System.out.println("The original string is: " + str);
  
    numChars = str.length();
    System.out.println("  This string has " + numChars + " characters.");

      // insert characters
    str.insert(4, " I know");
    System.out.println("The string, after insertion, is now: " + str);
    numChars = str.length();
    System.out.println("  This string has " + numChars + " characters.");

      // replace characters
    str.replace(12, 18, "to");  
    System.out.println("The string, after replacement, is: " + str);
    numChars = str.length();
    System.out.println("  This string has " + numChars + " characters.");
      
      // append characters
    str.append(" correct");
    System.out.println("The string, after appending, is: " + str);
    numChars = str.length();
    System.out.println("  This string has " + numChars + " characters.");
  
      // reverse the characters
    str.reverse();
    System.out.println("The string, after being reversed is: " + str);
  
  }
}