第1个回答 推荐于2016-07-10
System.out.println (str[i]); //输出以b打头的字母}System.out.println ("请输入字符串:");BufferedReader in=new BufferedReader(new InputStreamReader(System.in));String s=new String(in.readLine());System.out.println ("大写形式:");System.out.println (s.toUpperCase()); //输出大写形式System.out.println ("小写形式:");System.out.println (s.toLowerCase()); //输出小写形式BufferedReader br=new BufferedReader(new InputStreamReader(System.in));String s2=in.readLine();int index=s2.indexOf(' ');String dst1=new String(s2.substring(0,index));String dst2=new String(s2.substring(index+1,s2.length()));本回答被提问者采纳