// 程序6-11
public class ConvertStringToBuffer{
    public static void main(String args[ ]) {
        String s1,s2="Hello";
        
        s1=s2+" Java!"+3.14;						
        System.out.println("s1= "+s1+"  s2= "+s2);
        
            // 功能等價于如下程序段
        StringBuffer  str;
        str=new StringBuffer(s2);
        str.append(" Java!");
        str.append(Double.toString(3.14));
        System.out.println("str= "+str.toString( ));	
    }
}