检查字符串是否只包含字母 [英] Check if String contains only letters

问题描述

这个想法是读取一个字符串并验证它不包含任何数字字符.所以像smith23"这样的东西是不可接受的.

The idea is to have a String read and to verify that it does not contain any numeric characters. So something like "smith23" would not be acceptable.

推荐答案

你想要什么?速度还是简单?对于速度，请采用基于循环的方法.为简单起见，请采用基于单行正则表达式的方法.

What do you want? Speed or simplicity? For speed, go for a loop based approach. For simplicity, go for a one liner RegEx based approach.

速度

public boolean isAlpha(String name) {
    char[] chars = name.toCharArray();

    for (char c : chars) {
        if(!Character.isLetter(c)) {
            return false;
        }
    }

    return true;
}

简单

public boolean isAlpha(String name) {
    return name.matches("[a-zA-Z]+");
}

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