JAVA 中两种判断输入的是否是数字的方法
package t0806;
import java.io.*
;
import java.util.regex.*
;
public class zhengzehua_test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
System.out.println("请输入第一个数字:"
);
BufferedReader reader =
new BufferedReader(
new InputStreamReader(System.in));
String num1 =
reader.readLine();
while(!num1.matches("\\d+"
))
{
System.out.println("输入的不是数字，请重新输入"
);
num1 =
reader.readLine();
}
System.out.println("请输入第二个数字:"
);
String num2 =
reader.readLine();
while(!Pattern.compile("[0-9]*"
).matcher(num2).matches())
{
System.out.println("输入的不是数字，请重新输入"
);
num2 =
reader.readLine();
}
int result = Integer.parseInt(num1) *
Integer.parseInt(num2);
System.out.println("乘积是："+
result);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
转载于:https://www.cnblogs.com/snowwhite/p/4712724.html
