标签：java int isNumeric static boolean 三种 str 字符串 return
1用JAVA自带的函数
public static boolean isNumeric(String str){
for (int i = str.length();--i>=0;){
if (!Character.isDigit(str.charAt(i))){
return false;
}
}
return true;
}
2用正则表达式
public static boolean isNumeric(String str){
Pattern pattern = Pattern.compile("[0-9]*");
return pattern.matcher(str).matches();
}
3用ascii码
public static boolean isNumeric(String str){
for(int i=str.length();--i>=0;){
int chr=str.charAt(i);
if(chr<48 || chr>57)
return false;
}
return true;
}
标签：java,
int,
isNumeric,
static,
boolean,
三种,
str,
字符串,
return
From： https://blog.51cto.com/u_5454003/6129455