不知道这是什么问题，运行出错

[arsaluo]

public static int getTCPServerPortNum()
{
int num = 0;///调试在此出错
String host = "localhost";
for (int i = 1; i < 65536; i++)
{
try
{
Socket s = new Socket(host, i);
}
catch (UnknownHostException ex)
{
System.err.println(ex);
break;// it is not a server port
}
catch (IOException e)
{
e.printStackTrace();
break;// it is not a server port
}
num++;
}
return num;

}

[arsaluo]

public static int getTCPServerPortNum()
{
int num = 0;///调试在此出错
String host = "localhost";
for (int i = 1; i < 65536; i++)
{
try
{
Socket s = new Socket(host, i);
}
catch (UnknownHostException ex)
{
System.err.println(ex);
break;// it is not a server port
}
catch (IOException e)
{
e.printStackTrace();
break;// it is not a server port


==================================================================在这边处理错误
}
num++;
}
return num;

}








正确程序


public static int getTCPServerPortNum()
{
int num = 0;
String host = "localhost";
for (int i = 1; i < 65536; i++)
{
try
{
Socket s = new Socket(host, i);
}
catch (UnknownHostException ex)
{
System.err.println(ex);
break;// it is not a server port
}
catch (IOException e)
{
// it is not a server port
}
num++;
}
return num;

}

[arsaluo]

public static int getTCPServerPortNum()
{
int num = 0;///调试在此出错
String host = "localhost ";
for (int i = 1; i < 65536; i++)
{
try
{
Socket s = new Socket(host, i);
}
catch (UnknownHostException ex)
{
System.err.println(ex);
break;// it is not a server port
}
catch (IOException e)
{
e.printStackTrace();
break;// it is not a server port


==================================================================在这边处理错误
}
num++;
}
return num;

}








正确程序


public static int getTCPServerPortNum()
{
int num = 0;
String host = "localhost ";
for (int i = 1; i < 65536; i++)
{
try
{
Socket s = new Socket(host, i);
}
catch (UnknownHostException ex)
{
System.err.println(ex);
break;
}
catch (IOException e)
{
// it is not a server port
}
num++;
}
return num;

}

[li_d_s]

错误信息呢

[arsaluo]

这个是在抽象类中写的 会不会是这个问题？

[约翰羊]

调试没问题啊

[chengchaog]

这个是在抽象类中写的 会不会是这个问题？
------------------------------
没问题，可以有方法实现，看看jdk没问题不

[tomkai]

这个方法没有问题啊

[arsaluo]

那我使用的时候这么写可以吗？

tcpServerPortNum = SystemInformation.getTCPServerPortNum();

SystemInformation为此抽象类的名字

[fancuixia]

抽象类不能创建实例， 所以SystemInformation.getTCPServerPortNum();不能执行。

[arsaluo]

SystemInformation是类名 不是对象名 如果是对象名编译就通不过了

[li_d_s]

运行出错，Exception信息呢？搞得一堆人在猜错误原因