public class mock { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入一个整数："); int num = scanner.nextInt(); System.out.println("你输入的整数是：" + num); } }

该程序有语法错误，缺少加号连接字符串。

正确代码：

public class mock {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入一个整数：");
int num = scanner.nextInt();
System.out.println("你输入的整数是：" + num);
}
}