public class Alone12_3{
static boolean inNumberic(String num){
//在此插入代码
}
}
public static void main(String[] args){
System.out.println(isNumberic("123"));
System.out.println(isNumberic("-123.45"));
System.out.println(isNumberic("0x12"));
System.out.println(isNumberic("labc"));
System.out.println(isNumberic("-la33"));
}
}运行结果提示:
true
true
true
false
false
请大家帮我运用wrapper类写出来,在下感激不尽!
static boolean inNumberic(String num){
//在此插入代码
}
}
public static void main(String[] args){
System.out.println(isNumberic("123"));
System.out.println(isNumberic("-123.45"));
System.out.println(isNumberic("0x12"));
System.out.println(isNumberic("labc"));
System.out.println(isNumberic("-la33"));
}
}运行结果提示:
true
true
true
false
false
请大家帮我运用wrapper类写出来,在下感激不尽!
{
Number number = NumberFormat.getInstance().parse(num); return true;
}
catch(Exception e)
{
return false;
}
应该可以了呀
我试试了一下这个程序,他报这样的错
找不到符号
isNumberic
是他的事呀
我调试的如下:
import java.text.NumberFormat;
public class TestWapper{
//public static boolean inNumberic(String num){//}
public static boolean is(String num){
//在此插入代码
try
{
Number number = NumberFormat.getInstance().parse(num);
return true;
}catch(Exception e)
{
return false;
}
}
public static void main(String[] args){
System.out.println(is("12kkkkk3"));
System.out.println(is("-123.45"));
System.out.println(is("0x12"));
System.out.println(is("labc"));
System.out.println(is("-la33"));
}
}
public class test{
public static void main(String[] args){
if(Pattern.matches("\\d+","121324"))
System.out.println("is number");
else
System.out.println("is not number");}
}