大家好,我一直在为GUI设计一些按钮,我决定实现一些以前的代码。
但是,尝试编译时出现错误。在我的代码的141行中(特别是最后一个按钮),我被告知我有一个未报告的IOException
,必须被捕获或声明为抛出。
我的代码如下:
public void actionPerformed(ActionEvent ae) {
if ((ae.getSource() == button5) && (!connected)) {
try {
s = new Socket("127.0.0.1", 2020);
pw = new PrintWriter(s.getOutputStream(), true);
} catch (UnknownHostException uhe) {
System.out.println(uhe.getMessage());
} catch (IOException ioe) {
System.out.println(ioe.getMessage());
}
connected = true;
t = new Thread(this);
//b.setEnabled(false);
button5.setLabel("Disconnect");
t.start();
} else if ((ae.getSource() == button5) && (connected)) {
connected = false;
try {
s.close(); //no buffering so, ok
} catch (IOException ioe) {
System.out.println(ioe.getMessage());
}
//System.exit(0);
button5.setLabel("Connect");
} else {
temp = tf.getText();
pw.println(temp);
tf.setText("");
}
if (ae.getActionCommand().equals("Save it")) {
Scanner scan = new Scanner(System.in);
try {
PrintWriter pw = new PrintWriter(new FileWriter(new File("test.txt")));
for (;;) {
String temp = scan.nextLine();
if (temp.equals("")) {
break;
}
pw.println(temp);
}
pw.close();
} catch (IOException ioe) {
System.out.println("IO Exception! " + ioe.getMessage());
}
} else if (ae.getActionCommand().equals("Load it")) {
Scanner scan = new Scanner(System.in);
try {
BufferedReader br = new BufferedReader(new FileReader(new File("test.txt")));
String temp = "";
while ((temp = br.readLine()) != null) {
System.out.println(temp);
}
br.close();
} catch (FileNotFoundException fnfe) {
System.out.println("Input file not found.");
} catch (IOException ioe) {
System.out.println("IO Exception! " + ioe.getMessage());
}
} else if (ae.getActionCommand().equals("Clear it")) {
ta.setText("");
} else {
PrintWriter pw = new PrintWriter(new FileWriter(new File("test.txt")));
}
}
最佳答案
只需将try / catch块添加到以下代码(发布内容的结尾):
else{
PrintWriter pw = new PrintWriter (
new FileWriter(
new File("test.txt")));
}}
像这样:
else{
try{
PrintWriter pw = new PrintWriter (new FileWriter(new File("test.txt")));
} catch (Exception e) {
e.printStackTrace();
}
}}
关于java - Java未报告的异常使我感到困惑,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/30199449/