代码示例:
public static boolean isNumeric(String str){
Pattern pattern = Pattern.compile("[0-9]*");
Matcher isNum = pattern.matcher(str);
return isNum.matches();
}
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测试:
public static void main(String[] args) {
String str = "11";
String str1 = "11sdf";
System.out.println(isNumeric(str));
System.out.println(isNumeric(str1));
}
输出结果:
true
false
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