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CheckUtil.java
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61 lines (50 loc) · 1.32 KB
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package com.chen.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 检查工具类
* Created by chenwj3 on 2017/1/18.
*/
public class CheckUtil {
/**
* 判断字符串是不是null或无字符（trim）
*
* @param o
* @return
*/
public static Boolean isEmpty(String o) {
return (o == null || o.trim().length() == 0);
}
/**
* 判断字符串是不是数字
*
* @param str
* @return
*/
public static Boolean checkNum(String str) {
return !isEmpty(str) && str.matches("^\\d+$");
}
/**
* 判断字符串是否为数字,包括整数和小数.
*
* @param str
* @return
*/
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("^[-]?[0.0-9.0]+$");
Matcher isNum = pattern.matcher(str);
if (!isNum.matches()) {
return false;
}
return true;
}
public static void main(String[] args) {
System.out.println(isNumeric("1"));
System.out.println(isNumeric("-1"));
System.out.println(isNumeric("0"));
System.out.println(isNumeric("-3.2"));
System.out.println(isNumeric("3.2"));
System.out.println(isNumeric("1.3456"));
System.out.println(isNumeric("wqw12"));
}
}