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Java PrintWriter checkError()用法及代码示例


Java中PrintWriter类的checkError()方法用于检查此PrintWriter实例的错误状态。此方法刷新流以检查错误状态。它返回一个布尔值,该值指示流是否遇到任何错误。

用法:

public boolean checkError()

参数:此方法不接受任何参数。


返回值:此方法返回一个布尔值,该值指示Stream是否遇到任何错误。如果遇到任何错误,则返回true。否则返回false。

下面的方法说明了checkError()方法的用法方式:

示例1:

// Java program to demonstrate 
// PrintWriter checkError() method 
  
import java.io.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // The string to be written in the Writer 
        String str = "GeeksForGeeks"; 
  
        try { 
  
            // Create a PrintWriter instance 
            PrintWriter writer 
                = new PrintWriter(System.out); 
  
            // Write the above string to this writer 
            // This will put the string in the stream 
            // till it is printed on the console 
            writer.write(str); 
  
            // Now check the stream 
            // using checkError() method 
            System.out.println("\nHas any error occurred: "
                               + writer.checkError()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}
输出:
GeeksForGeeks
Has any error occurred: false

示例2:

// Java program to demonstrate 
// PrintWriter checkError() method 
  
import java.io.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
  
            // Create a PrintWriter instance 
            PrintWriter writer 
                = new PrintWriter(System.out); 
  
            // Write the char to this writer 
            // This will put the char in the stream 
            // till it is printed on the console 
            writer.write(65); 
  
            // Now check the stream 
            // using checkError() method 
            System.out.println("\nHas any error occurred: "
                               + writer.checkError()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}
输出:
A
Has any error occurred: false


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注:本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 PrintWriter checkError() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。