Java FilterWriter flush()方法

java.io.FilterWriter.flush() 方法刷新出来的字符串。

1 语法

public void flush()

2 参数

无

3 返回值

无

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.FilterWriter.flush()方法的例子
 */
import java.io.FilterWriter;
import java.io.StringWriter;
import java.io.Writer;

public class Demo {
    public static void main(String[] args) throws Exception {
        FilterWriter fw = null;
        Writer w = null;
        String s = null;

        try {
            // create new reader
            w = new StringWriter(6);

            // filter writer
            fw = new FilterWriter(w) {
            };

            // write to filter writer
            fw.write(65);

            // flushes the content
            fw.flush();
            System.out.println("flush() invoked");
            System.out.println("flushes content to the writer");

            // get the string
            s = w.toString();

            // print
            System.out.print("String: "+s);

        } catch(Exception e) {
            // if any I/O error occurs
            e.printStackTrace();
        } finally {
            // releases system resources associated with this stream
            if(w!=null)
                w.close();
            if(fw!=null)
                fw.close();
        }
    }
}

输出结果为：

flush() invoked
flushes content to the writer
String: A