这是一个既没有array也没有arraylist的版本。结果将按您的要求打印到标准输出。
String[] allLetters = new String[] {
"0",
"1",
"ABC",
"DEF",
"GHI",
"JKL",
// etc...
};
public static void convert(String phoneNumber)
{
convertSubstring(phoneNumber,"");
}
private static void convertSubstring(String phoneNumber, String convertedLetters)
{
int digit = Integer.parseInt(phoneNumber.substring(0, 1));
String letters=allLetters[digit];
String remainingString=phoneNumber.substring(1);
for (int i = 0; i < letters.length(); ++i)
{
char letter = letters.charAt(i);
String result=convertedLetters+letter;
if (remainingString.length()==0)
System.out.println(result);
else
convertSubstring(remainingString, result);
}
}
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