java判斷是否是字母的方法代碼：
/** 速度快
* 判斷是否為整數(shù)
* @param str 傳入字符串
* @return 是整數(shù)返回true，否則返回false
*/
public static boolean isInteger(String str){
Pattern pattern=Pattern.compile("^[-\\+]?[\\d]*$");
return pattern.matcher(str).matches();
}
/**
* 判斷是否是字母
* @param str 傳入字符串
* @return 是字母返回true，否則返回false
*/
public boolean is_alpha(String str) {
if(str==null) return false;
return str.matches("[a-zA-Z]+");
}
/**
* 判斷是否是字母或者數(shù)字
* @param str 傳入字符串
* @return 是字母返回true，否則返回false
*/
public static boolean isLetterDigit(String str) {
String regex = "^[a-z0-9A-Z]+$";
return str.matches(regex);
}上述代碼中判斷是否是字母主要使用正則表達式"[a-zA-Z]+"，此表達式可以匹配字符串中所有字母，是字母返回true，否則返回false。
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