Java中的 StringWriter close() 方法及示例

Java中的StringWriter类的close()方法用于关闭编写器。关闭 writer 会释放其中的任何值或与之关联的任何资源。 StringWriter 实例一旦关闭将不起作用。此外，一旦关闭的 StringWriter 实例也无法再次关闭。

句法：

public void close()

参数：此方法不接受任何参数。

返回值：此方法不返回任何值。它只是关闭流。

下面的程序说明了 close() 方法的工作：

方案一：

// Java program to demonstrate
// StringWriter close() method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // The string to be written in the Stream
        String str = "GeeksForGeeks";
  
        try {
  
            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();
  
            // Write the above string to this writer
            // This will put the string in the writer
            // till it is printed on the console
            writer.write(str);
  
            System.out.println(writer.toString());
  
            // Now close the writer
            // using close() method
            writer.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

GeeksForGeeks

方案二：

// Java program to demonstrate
// StringWriter close() method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a StringWriter instance
            StringWriter writer
                = new StringWriter();
  
            // Write the char to this writer
            // This will put the char in the writer
            // till it is printed on the console
            writer.write(65);
  
            System.out.println(writer.toString());
  
            // Now close the writer
            // using close() method
            writer.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

A