📜  带有示例的Java中的扫描仪 ioException() 方法

📅  最后修改于: 2022-05-13 01:55:36.404000             🧑  作者: Mango

带有示例的Java中的扫描仪 ioException() 方法

Java.util.Scanner类的ioException()方法返回此 Scanner 的底层 Readable 最后抛出的IOException 。如果不存在此类异常,则此方法返回 null。

句法:

public IOException ioException()

返回值:此函数返回此扫描仪可读的最后一次抛出的异常

下面的程序说明了上述函数:

方案一:

// 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

方案二:

// 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: Java/util/Scanner.html#ioException()