Java PrintWriter checkError()方法及示例

Java中PrintWriter类的checkError()方法是用来检查这个PrintWriter实例的错误状态。这个方法冲刷流以检查错误状态。它返回一个布尔值，说明流是否遇到任何错误。

语法。

public boolean checkError()

参数。此方法不接受任何参数。

返回值。该方法返回一个布尔值，说明流是否遇到了任何错误。如果遇到任何错误，它将返回true。否则，它返回false。

下面的方法说明了checkError()方法的工作。

程序 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

程序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