Java 中的 Scanner ioException()方法，带示例
原文:https://www . geesforgeks . org/scanner-ioexception-method-in-Java-with-examples/
Java . util . Scanner类的 ioException() 方法返回该扫描器的底层可读最后抛出的 IOException 。如果不存在此类异常，此方法将返回 null。
语法:
public IOException ioException()
返回值:该函数返回该扫描仪可读的最后一个异常。
以下程序说明了上述功能:
*程序 1:*
// Java program to illustrate the
// ioException() method of Scanner class in Java
// without parameter
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "gfg geeks!";
// create a new scanner
// with the specified String Object
Scanner scanner = new Scanner(s);
// print the line
System.out.println("" + scanner.nextLine());
// check if there is an IO exception
System.out.println("" + scanner.ioException());
// close the scanner
scanner.close();
}
}
**输出:
gfg geeks!
null
程序二:
// Java program to illustrate the
// ioException() method of Scanner class in Java
// without parameter
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "gopal dave!";
// new scanner with the specified String Object
Scanner scanner = new Scanner(s);
// print the line
System.out.println("" + scanner.nextLine());
// checks if there is an IO exception
System.out.println("" + scanner.ioException());
// close the scanner
scanner.close();
}
}
输出:
gopal dave!
null
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/scanner . html # ioException()**
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