Java中的 PrintWriter checkError() 方法及示例

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，指示流是否遇到任何错误。

句法：

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，说明 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() 方法的工作：

方案一：

// 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

方案二：

// 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