版权声明:版权所有,违者必究 https://blog.csdn.net/weixin_39921821/article/details/87260569
代码部分:
package com.yinxin.util;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
/**
* 判断一个字符串是否是数字。
*
* @param string
* @return
*/
public static boolean isNumber(String string) {
if (string == null)
return false;
Pattern pattern = Pattern.compile("^-?\\d+(\\.\\d+)?$");
return pattern.matcher(string).matches();
}
private static void isNumberTest() {
System.out.println(isNumber("580"));
System.out.println(isNumber("5234254125424584"));
System.out.println(isNumber("dfg15s4df5sd1fds"));
}
public static void main(String[] args) {
isNumberTest();
}
}
执行结果: