写一个java程序，键盘输入一个数求这个数的绝对值

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Abs {

public static void main(String[] args) {
Abs();
}

public static void Abs() {
System.out.println("输入一个数：");
BufferedReader line = new BufferedReader(new InputStreamReader(
System.in));
try {
double asd = Math.abs(Double.valueOf(line.readLine()));
System.out.println("绝对值是："+asd);
} catch (IOException e) {
e.printStackTrace();
} catch (NumberFormatException e1){
System.out.println("输入的不是数");
}
}
}

main()
{
int x;
if(x>0)
return x;
else
return -x;
}本回答被提问者采纳