Java中的 PrintWriter flush() 方法及示例

Java中PrintWriter类的flush()方法用于刷新流。通过刷新流，这意味着清除流中可能存在或不在流中的任何元素。它既不接受任何参数也不返回任何值。

句法：

public void flush()

参数：此方法不接受任何参数。

返回值：此方法不返回任何值。它只是刷新流。

以下方法说明了 flush() 方法的工作原理：

方案一：

// 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

方案二：

// 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