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Java Scanner ioException()用法及代碼示例


java.util.Scanner類的ioException()方法返回此Scanner的基礎Readable引發的最後一次IOException。如果不存在此類異常,則此方法返回null。

用法:

public IOException ioException()

返回值:此函數返回此掃描儀的可讀性引發的最後一個異常。


以下示例程序旨在說明上述函數:

示例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(); 
    } 
}
輸出:
gfg geeks!
null

示例2:

// 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(); 
    } 
}
輸出:
gopal dave!
null

參考: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#ioException()



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