Java中的PushbackReader类的close()方法用于关闭流并释放流中繁忙的资源(如果有)。此方法具有以下结果:
- 如果流是打开的,则关闭流以释放资源
- 如果流已经关闭,则将无效。
- 如果对流执行任何读取或其他类似操作,则在关闭后,将引发IOException
用法:
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。
异常:如果输入输出时发生某些错误,则此方法将引发IOException。
下面的方法说明了close()方法的用法方式:
程序1:
// Java program to demonstrate
// PushbackReader close() method
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
String s = "GeeksForGeeks";
// Initializing a StringReader and PushbackReader
StringReader stringReader
= new StringReader(s);
PushbackReader pushbackReader
= new PushbackReader(stringReader);
System.out.println("Is stream ready: "
+ pushbackReader.ready());
// Close the stream using close()
pushbackReader.close();
System.out.println("Stream Closed.");
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Is stream ready: true Stream Closed.
程序2:
// Java program to demonstrate
// PushbackReader close() method
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
// Initializing a StringReader and PushbackReader
String s = "GFG";
StringReader stringReader
= new StringReader(s);
PushbackReader pushbackReader
= new PushbackReader(stringReader);
System.out.println("Is stream ready: "
+ pushbackReader.ready());
// Close the stream using close()
pushbackReader.close();
System.out.println("Stream Closed.");
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Is stream ready: true Stream Closed.
参考: https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#close-
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注:本文由纯净天空筛选整理自srinam大神的英文原创作品 PushbackReader close() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。