package chapter.second;
import
public class JSysteminReadTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
              byte[] b=new byte[100];
              int count=System.in.read(b);
                      for(int i=0;i<=count-1;i++)
                      {
                         System.out.print((char)b[i]);
                      }
    }

}

有大神吗？

是不是异常哦，捕获就行了try{}catch(){}    或者抛异常

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        byte[] b = new byte[100];
        int count;
        try {
            count = System.in.read(b);
            for (int i = 0; i <= count - 1; i++) {
                System.out.print((char) b[i]);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

红线地方加上try-catch块就好了

try catch一下