Java PushbackReader ready()用法及代碼示例

Java中的PushbackReader類的ready()方法用於檢查此PushbackReader是否準備就緒。它返回一個布爾值，該值指示閱讀器是否準備就緒。

用法:

public void ready()

參數：此方法不接受任何參數

返回值：此方法返回一個布爾值，該值指示此PushbackReader是否準備好被讀取。如果準備就緒，則返回true。否則返回false。

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ready()方法的用法方式：

程序1:

// Java program to demonstrate 
// PushbackReader ready() method 
  
import java.io.*; 
import java.util.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
            // Initializing a StringReader 
            // and PushbackReader 
            String s = "GeeksForGeeks"; 
  
            StringReader stringReader 
                = new StringReader(s); 
            PushbackReader pushbackReader 
                = new PushbackReader(stringReader); 
  
            // Check if the PushbackReader is 
            // ready to be read using ready() 
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready()); 
  
            // Close the stream using ready() 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Is PushbackReader ready to be read: true
Stream Closed.

程序2:

// Java program to demonstrate 
// PushbackReader ready() 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); 
  
            // Check if the PushbackReader is 
            // ready to be read using ready() 
            System.out.println("Is PushbackReader ready "
                               + "to be read: "
                               + pushbackReader.ready()); 
  
            // Close the stream 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Is PushbackReader ready to be read: true
Stream Closed.

參考： https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#ready-

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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 ready() 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。