Java 未处理的异常,但try catch blocks不';我似乎没有做我认为应该做的事
我目前正在连接一个IRC服务器,我收到一个抛出的错误,上面说“error:(20,16)java:unreported exception java.io.IOException;必须捕获或声明要抛出” 我也试过了Java 未处理的异常,但try catch blocks不';我似乎没有做我认为应该做的事,java,unknown-host,Java,Unknown Host,我目前正在连接一个IRC服务器,我收到一个抛出的错误,上面说“error:(20,16)java:unreported exception java.io.IOException;必须捕获或声明要抛出” 我也试过了 private PrintStream out; private void connect() throws IOException, UnknownHostException { try { Socket socket = new Socket(host,
private PrintStream out;
private void connect() throws IOException, UnknownHostException {
try {
Socket socket = new Socket(host, port);
out = new PrintStream(socket.getOutputStream());
} catch (UnknownHostException ex){
System.out.println(ex.getMessage());
}
}
以及
private PrintStream out;
private void connect() throws IOException, UnknownHostException {
try {
Socket socket = new Socket(host, port);
try {
out = new PrintStream(socket.getOutputStream());
} catch(IOException exc){
System.out.println(exc.getMessage());
}
} catch (UnknownHostException ex){
System.out.println(ex.getMessage());
}
}
但在我尝试过的所有选项中,错误仍然存在。您必须用try catch环绕connect()。connect方法引发异常
public connection(String host, int port){
this.host = host;
this.port = port;
try{
connect(); //This line is erroring
}catch(Exception e){}
register();
}您已经定义了抛出IOException和UnknownHostException的方法
private void connect() throws IOException, UnknownHostException {
}
现在,当您调用这个方法时,您必须像下面那样处理这些异常
try {
connect();
} catch (IOException e) {
e.printStackTrace();
}
另一方面,您捕获了connect()方法中的错误。因此,不需要在方法定义中再次抛出它们。例如,您可以像下面这样定义您的方法。如果使用此方法,可以使用当前语法调用connect()方法
private void connect(){
}
private void connect(){
}