Java中的编写器 close() 方法和示例
Java Writer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。 Writer 实例一旦关闭将无法工作。同样,一旦关闭的 Writer 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。
下面的方法说明了 close() 方法的工作:
方案一:
// Java program to demonstrate
// Writer 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 Writer instance
Writer writer
= new PrintWriter(System.out);
// 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);
// 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
// Writer close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a Writer instance
Writer writer
= new PrintWriter(System.out);
// Write the char to this writer
// This will put the char in the writer
// till it is printed on the console
writer.write(65);
// Now close the writer
// using close() method
writer.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
A