Android String to Float Convert isFloat(String str)

Description

is Float

Declaration

public static boolean isFloat(String str) 

Method Source Code

//package com.java2s;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static boolean isFloat(String str) {
        if (isLong(str)) {
            return true;
        }//  w w  w.ja  v  a  2  s.co m
        Pattern pattern = Pattern.compile("\\d*\\.{1}\\d+");
        Matcher isNum = pattern.matcher(str);
        if (!isNum.matches()) {
            return false;
        }
        return true;
    }

    public static boolean isFloat(String str, int precision) {
        String regStr = "\\d*\\.{1}\\d{" + precision + "}";
        Pattern pattern = Pattern.compile(regStr);
        Matcher isNum = pattern.matcher(str);
        if (!isNum.matches()) {
            return false;
        }
        return true;
    }

    public static boolean isLong(String str) {
        if ("0".equals(str.trim())) {
            return true;
        }
        Pattern pattern = Pattern.compile("^[^0]\\d*");
        Matcher isNum = pattern.matcher(str);
        if (!isNum.matches()) {
            return false;
        }
        return true;
    }
}

Related

1. String2AmountFloat(String str)
2. isFloat(String str, int precision)
3. getFloatValue(double val, int len)
4. parseFloat(String string, float defValue)
5. TryParse(String str, float defaultFloat)