用示例在 Java 中编写 close()方法
原文:https://www . geesforgeks . org/writer-close-method-in-Java-with-examples/
Java 中close()Writer类的方法用来关闭 Writer。关闭编写器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。此外，Writer 实例一旦关闭，就不能再次关闭。
语法:
public void close()
参数:该方法不接受任何参数。
返回值:此方法不返回值。它只是关闭了流。
下面的方法说明了 close()方法的工作原理:
程序 1:
// 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);
}
}
}
Output:
GeeksForGeeks
程序 2:
// 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);
}
}
}
Output:
A
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