我想做一个带有数字字段和一个按钮的Java程序。单击该按钮时,它将等待输入"数字字段"的时间。整数工作正常,但函数不起作用。
这是代码:
public void jButton1_ActionPerformed(ActionEvent evt) {
sekunden = Integer.parseInt(jNumberField3.getText());
minuten = Integer.parseInt(jNumberField2.getText());
stunden = Integer.parseInt(jNumberField1.getText());
zeit = sekunden + minuten*60 + stunden*60*60;//berechnet die zeit in sekunden
TimeUnit.SECONDS.sleep(zeit);//here is the error
System.out.println("zeit");
} // end of jButton1_ActionPerformed
错误消息如下所示:
ES.java:78:27: error: unreported exception InterruptedException; must be caught or declared to be thrown TimeUnit.SECONDS.sleep(zeit);
方法调用TimeUnit.SECONDS.sleep(zeit)
抛出一个必须捕获的InterruptedException
:
public void jButton1_ActionPerformed(ActionEvent evt) {
try {
sekunden = Integer.parseInt(jNumberField3.getText());
minuten = Integer.parseInt(jNumberField2.getText());
stunden = Integer.parseInt(jNumberField1.getText());
zeit = sekunden + minuten*60 + stunden*60*60;//berechnet die zeit in sekunden
TimeUnit.SECONDS.sleep(zeit);//here is the error
System.out.println("zeit");
}catch (InterruptedException e){
//handle the exception
}
}
您需要
处理调用sleep()
时可能发生的潜在InterruptedException
。这就是您的代码收到编译错误的原因。
请查看 JavaDocs 上的捕获和处理异常,了解有关异常处理的更多详细信息。
在您的情况下,您可以通过处理异常轻松解决它,例如:
public void jButton1_ActionPerformed(ActionEvent evt) {
sekunden = Integer.parseInt(jNumberField3.getText());
minuten = Integer.parseInt(jNumberField2.getText());
stunden = Integer.parseInt(jNumberField1.getText());
zeit = sekunden + minuten*60 + stunden*60*60;//berechnet die zeit in sekunden
try {
// tries to call sleep
TimeUnit.SECONDS.sleep(zeit);//here is the error
} catch (InterruptedException e) {
// handles any possible exception during the call to "sleep()"
e.printStackTrace(); // prints the exception stack trace to the console
}
System.out.println("zeit");
} // end of jButton1_ActionPerformed
异常处理中的一些很好的参考是:
- Java 异常处理
- 处理 Java 异常的最佳实践