Java中的 PrintWriter clearError() 方法及示例

Java中PrintWriter类的clearError()方法用于清除此 PrintWriter 实例的错误状态。它清除流中可能发生或未发生的任何错误。因此 checkError() 方法在此方法之后将始终返回 false。

句法：

protected void clearError()

参数：此方法不接受任何参数。

返回值：此方法不返回任何值。

下面的方法说明了 clearError() 方法的工作：

方案一：

// Java program to demonstrate
// PrintWriter clearError() method
  
import java.io.*;
  
class GFG extends PrintWriter {
  
    // Defining the protected constructor
    public GFG(OutputStream out)
    {
        super(System.out);
    }
  
    // Driver Code
    public static void main(String[] args)
    {
  
        // The string to be written in the Writer
        String str = "GeeksForGeeks";
  
        try {
  
            // Create a PrintWriter instance
            GFG writer
                = new GFG(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 clear the stream
            // using clearError() method
            writer.clearError();
  
            System.out.println("\nHas any error occurred: "
                               + writer.checkError());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

GeeksForGeeks
Has any error occurred: false

方案二：

// Java program to demonstrate
// PrintWriter clearError() method
  
import java.io.*;
  
class GFG extends PrintWriter {
  
    // Defining the protected constructor
    public GFG(OutputStream out)
    {
        super(System.out);
    }
  
    // Driver Code
    public static void main(String[] args)
    {
  
        // The string to be written in the Writer
        String str = "GeeksForGeeks";
  
        try {
  
            // Create a PrintWriter instance
            GFG writer
                = new GFG(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 clear the stream
            // using clearError() method
            writer.clearError();
  
            System.out.println("\nHas any error occurred: "
                               + writer.checkError());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

A
Has any error occurred: false