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Java PushbackReader close()用法及代碼示例


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。