Java 中的 BufferedWriter flush()方法，示例

原文:https://www . geeksforgeeks . org/bufferedwriter-flush-in-Java-method-with-examples/

Java 中 BufferedWriter 类的 flush() 方法用于从缓冲的编写器流中刷新字符。

语法:

public void flush()
            throws IOException

指定者:该方法由可冲界面的冲()方法指定。

覆盖:该方法覆盖 Writer 类的 flush()方法。

参数:此方法不接受任何参数。

返回值:此方法不返回值。

异常:如果出现输入输出错误，该方法抛出异常。

下面的程序说明了 IO 包中 BufferedWriter 类中的 flush()方法:

程序 1:

// Java program to illustrate
// BufferedWriter flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // Create the string Writer
        StringWriter stringWriter
            = new StringWriter();

        // Convert stringWriter to
        // bufferedWriter
        BufferedWriter buffWriter
            = new BufferedWriter(
                stringWriter);

        // Write "GEEKS" to buffer writer
        buffWriter.write(
            "GEEKSFORGEEKS", 0, 5);

        // Flush the buffer writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());
    }
}

Output:

GEEKS

程序 2:

// Java program to illustrate
// BufferedWriter flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {
        // Create the string Writer
        StringWriter stringWriter
            = new StringWriter();

        // Convert stringWriter to
        // bufferedWriter
        BufferedWriter buffWriter
            = new BufferedWriter(
                stringWriter);

        // Write "GEEKS" to buffered writer
        buffWriter.write(
            "GEEKSFORGEEKS", 0, 5);

        // Flush the buffered writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());

        // Write "GEEKSFORGEEKS"
        // to buffered writer
        buffWriter.write(
            "GEEKSFORGEEKS", 5, 8);

        // Flush the buffered writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());
    }
}

Output:

GEEKS
GEEKSFORGEEKS

参考文献: https://docs . Oracle . com/javase/10/docs/API/Java/io/bufferedwriter . html # flush()

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