stringbuffer1.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//StringBuffer1.java
public class StringBuffer1{
  public static void main(String[] args) {
    StringBuffer buf1=new StringBuffer();       //创建空字符串变量
    StringBuffer buf2=new StringBuffer(10);     //创建空字符串变量，初始长度为10个字符
    StringBuffer buf3=new StringBuffer("hello");//用指定串"hello"创建字符串变量
             
    //使用StringBuffer的toString方法将三个StringBuffer对象转换成String对象输出
    System.out.print("buf1 = " + buf1.toString()+"            ,  ");
    System.out.print("buf2 = " + buf2.toString()+"            ,  ");
    System.out.print("buf3 = " + buf3.toString()+"\n");
    //返回当前字符串长度
    System.out.print("buf1.length()   = "+buf1.length()+",  ");
    System.out.print("buf2.length()   = "+buf2.length()+",  ");
    System.out.print("buf2.length()   = "+buf3.length()+"\n");
    //返回当前缓冲区长度
    System.out.print("buf1.capacity() = "+ buf1.capacity()+", ");
    System.out.print("buf2.capacity() = "+ buf2.capacity()+", ");
    System.out.print("buf3.capacity() = "+ buf3.capacity()+"\n");
  }
}