Java PrintWriter flush()方法及示例

Java中PrintWriter类的flush()方法用于冲刷流。通过冲刷流，它意味着清除流中可能存在或不存在的任何元素。它既不接受任何参数，也不返回任何值。

语法。

public void flush()

参数。此方法不接受任何参数。

返回值。这个方法不返回任何值。它只是冲刷流。

下面的方法说明了flush()方法的工作。

程序 1:

// Java program to demonstrate
// PrintWriter flush() 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 clear the stream
            // using flush() method
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

GeeksForGeeks

程序2。

// Java program to demonstrate
// PrintWriter flush() 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 clear the stream
            // using flush() method
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

A