e408.java

清华大学第二版

class e408{
	public static void main(String args[]) {
		String str = "This is the first string.";
        String s2=  str.concat("ddd");
        s2=s2+"FF";

        StringBuffer t=new StringBuffer("sss"); 
        //t=t+"dd";
        t.append("dd");
        
		System.out.println(s2 + t );
	}
}