StringBuffer的测试

//StringBuffer的测试

/**
 *<p>项目名称:  Java</p>
 *<p>文件名称:  StringBufferTest</p>
 *<p>版权所有:  版权所有(C)2008-2010</p>
 *<p>公    司:   
 *<p>编写日期: 2008-7-15上午08:46:43</p>
 *<p>作    者:  huangtao</p>
 */

/**
 * @author huangtao
 *
 */
public class StringBufferTest
{

 /**
  * @param args
  */
 public static void main(String[] args)
 {
  char[] chone = new char[]{'1' , '2' , '3' , '4'};
  //产生的StringBuffer对象的方式
  StringBuffer sbone = new StringBuffer();

  //StringBuffer的附加方法的使用
  System.out.println(sbone.append(new Boolean("true").booleanValue()));
  System.out.println(sbone.append('9'));
  System.out.println(sbone.append(chone));
  System.out.println(sbone.append(new Double("10D").doubleValue()));
  System.out.println(sbone.append(new Float("5F").floatValue()));
  System.out.println(sbone.append(new Integer("10").intValue()));
  System.out.println(sbone.append(new Long("4").longValue()));
  System.out.println(sbone.append(new Person("huangtao" , 24)));
  System.out.println(sbone.append(new String("how are you")));
  System.out.println(sbone.append(new StringBuffer("beijing")));
  System.out.println(sbone.append(chone , 0 , 2));

  //返回当前容量
  StringBuffer sbtwo = new StringBuffer("2008");
  System.out.println(sbtwo.capacity());
  System.out.println(new StringBuffer().capacity());
  
  //返回某个索引处的字符
  StringBuffer sbthree = new StringBuffer("0123456");
  for(int i = 0 ; i<sbthree.length() ; i++)
  {
   System.out.println(sbthree.charAt(i));
   
   //返回某个索引处的unicode码
   System.out.println(sbthree.codePointAt(i));
  }
  
  //返回某个索引处的unicode码的个数
  System.out.println(sbthree.codePointCount(0 , sbthree.length()));
  System.out.println(sbthree.codePointBefore(7));
  
  //删除某个索引开始处的字符序列
  System.out.println(sbthree.delete(0 , 3));//3456
  System.out.println(sbthree.append("012"));//3456012
  
  //删除某个索引处的字符
  System.out.println(sbthree.deleteCharAt(6));
  sbthree.ensureCapacity(16);
  
  //转换成一个字符数组
  StringBuffer sbfour = new StringBuffer("2008");
  char[] chtwo = new char[10];
  sbfour.getChars(0 , sbfour.length() , chtwo , chtwo.length-sbfour.length());
  for(int i = 0 ; i<chtwo.length ; i++)
  {
   System.out.println(chtwo[i]);
  }
  
  //合理分配StringBuffer的容量
  sbfour.trimToSize();
  
  //截取子字符串
  System.out.println(sbfour.substring(0 , 3));
  System.out.println(sbfour.substring(3));
  System.out.println(sbfour.reverse());
  System.out.println(sbfour.length()+"_"+sbfour.substring(0));
  
  //更改某个索引处的字符
  sbfour.setCharAt(sbfour.length()-1 , '9');
  System.out.println(sbfour.length()+"_"+sbfour.substring(0));
  
  //用指定字符串替换某个范围内的字符串
  StringBuffer sbsix = new StringBuffer("h123h123hhbeijing");
  System.out.println(sbsix.replace(0+4 , sbsix.length() , "999"));
  
  //在指定索引处插入数据
  StringBuffer sbseven=new StringBuffer("2008");
  System.out.println(sbseven.insert(0 , new char[]{'c','h','i','n','a'} , 0 , new char[]{'c','h','i','n','a'}.length));
  System.out.println(sbseven.insert(sbseven.indexOf("2") , "beijing"));
  sbseven.trimToSize();
  System.out.println(sbseven.insert(0 , "中国北京"));
 }
}

class Person
{
 int    age;

 String name;

 Person(String name , int age)
 {
  this.age = age;
  this.name = name;
 }

 public String toString()
 {
  return "name="+name+",age="+age;
 }
}