//class StringEditor
public class StringEditor
{
public static String removeNonLetters(String original)
{
StringBuffer aBuffer=new StringBuffer(original.length());
char aCharacter;
for(int i=0;
i【已知一个字符串，返回将字符串中的非字母字符都删除后的字符串】//class StringEditorTester
public class StringEditorTester
{
public static void main(String args[])
{
String original="hello123,my name is mark,234i think you are my classmate?!!";
System.out.println(StringEditor.removeNonLetters(original));
}
}结果
