import java.math.BigDecimal;

import java.util.regex.Pattern;

public class test {

    public static void main(String[] args) {

        BigDecimal a = new BigDecimal(1000);

        BigDecimal b = new BigDecimal(99.999);

        String integerStr = a+"" ;

        String doubleStr = b+"";

        System.out.println(Pattern.matches("\\d+", integerStr));//判断是否可转换为Integer(short即long可以发散,就是改正则)

        System.out.println(Pattern.matches("\\d+\\.+", integerStr));//判断是否可转换为Double

    }

}