Java 判断输入是否为英文字符

 代码如下:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package onlinedictionarytest.cn.edu.ynu.sei.test;

/**
 *
 * @author crystal
 */
public class IsLetter {

    public IsLetter() {
    }

    /**
     *
     * @param word: 输入的字符串
     * @return 是否输入的是字符
     */
    public boolean CharIsLetter(String word) {
        boolean sign = true;                                           //初始化标志为为'true'
        for (int i = 0; i < word.length(); i++) {                 //遍历输入字符串的每一个字符
            if (!Character.isLetter(word.charAt(i))) {     //判断该字符是否为英文字符
                sign = false;                                                //若有一位不是英文字符，则将标志位修改为'false'
            }
        }
        return sign;                                                         //返回标志位结果
    }

    public static void main(String[] args) {
        IsLetter c = new IsLetter();
        if (c.CharIsLetter("123a")) {
            System.out.println("Your input are letters");
        } else {
            System.err.println("Your input aren't letters");
        }
    }
}

 

测试结果: 输入为' word '

init:
deps-jar:
Compiling 1 source file to E:\NetbeansProject\OnlineDictionaryTest\build\classes
compile-single:
run-single:
Your input are letters
BUILD SUCCESSFUL (total time: 0 seconds)

测试结果: 输入为'123a'

init:
deps-jar:
Compiling 1 source file to E:\NetbeansProject\OnlineDictionaryTest\build\classes
compile-single:
run-single:
Your input aren't letters
BUILD SUCCESSFUL (total time: 0 seconds)