Java determines whether a string is an integer number

Code example:

/** * 判断字符串是否为数字 */ public static boolean isNumeric(String str){ Pattern pattern = Pattern.compile("[0-9]*"); Matcher isNum = pattern.matcher(str); return isNum.matches(); }

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Test:

public static void main(String[] args) { String str = "11"; String str1 = "11sdf"; System.out.println(isNumeric(str)); System.out.println(isNumeric(str1)); }

Output results:

true false

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