publicclassExample8_20{publicstaticvoidmain(Stringargs[]){StringBufferstr=newStringBuffer();str.append("大家好");System.out.println("str:"+str);System.out.println("length...

public class Example8_20 {

public static void main(String args[]) {

StringBuffer str=new StringBuffer();

str.append("大家好");

System.out.println("str:"+str);

System.out.println("length:"+str.length());

System.out.println("capacity:"+str.capacity());

str.setCharAt(0 ,'w');

str.setCharAt(1 ,'e');

System.out.println(str);

str.insert(2, " are all");

System.out.println(str);

int index=str.indexOf("好");

str.replace(index,str.length()," right");

System.out.println(str);

}

}

import java.util.*;

public class Example8_12 {

public static void main(String args[]) {

String s="you are welcome(thank you),nice to meet you";

StringTokenizer fenxi=new StringTokenizer(s,"() ,");

int number=fenxi.countTokens();

while(fenxi.hasMoreTokens()) {

String str=fenxi.nextToken();

System.out.print(str+" ");

}

System.out.println("共有单词："+number+"个");

}

}

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