Java中的PushbackReader類的close()方法用於關閉流並釋放流中繁忙的資源(如果有)。此方法具有以下結果:
- 如果流是打開的,則關閉流以釋放資源
- 如果流已經關閉,則將無效。
- 如果對流執行任何讀取或其他類似操作,則在關閉後,將引發IOException
用法:
public void close()
參數:此方法不接受任何參數
返回值:此方法不返回任何值。
異常:如果輸入輸出時發生某些錯誤,則此方法將引發IOException。
下麵的方法說明了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);
}
}
}
輸出:
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);
}
}
}
輸出:
Is stream ready: true Stream Closed.
參考: https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#close-
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注:本文由純淨天空篩選整理自srinam大神的英文原創作品 PushbackReader close() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。