Java PushbackReader skip(long)用法及代碼示例

Java中的PushbackReader類的skip(long)方法用於跳過流中指定數量的字符。此字符數被指定為參數。如果通過跳過到達流的末尾，它將阻塞流，直到它獲得一些字符或拋出IOException。

用法:

public long skip(long numberOfChar)

參數：此方法接受參數numberOfChar，該參數是此方法要跳過的字符數。

返回值：此方法返回一個long值，該值是此方法跳過的實際字符數。

異常：該方法拋出：

IOException：如果輸入輸出時發生一些錯誤
IllegalArgumentException：如果傳遞的numberOfChar為負。

下麵的方法說明了skip(long)方法的用法方式：

示例1:

// Java program to demonstrate 
// PushbackReader skip(long) 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); 
  
            // Get the character 
            // to be read from the stream 
            int ch; 
  
            // Read the first 5 characters 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            for (int i = 0; i < 5; i++) { 
                ch = pushbackReader.read(); 
                System.out.print((char)ch); 
            } 
  
            System.out.println(); 
  
            // skip 3 characters using skip(long) 
            pushbackReader.skip(3); 
  
            System.out.println("Next 3 characters skipped."); 
  
            // Read the 2 characters 
            // to this reader using read() method 
            for (int i = 0; i < 2; i++) { 
                ch = pushbackReader.read(); 
                System.out.print((char)ch); 
            } 
  
            System.out.println(); 
  
            // Close the stream 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Geeks
Next 3 characters skipped.
Ge
Stream Closed.

示例2:

// Java program to demonstrate 
// PushbackReader skip(long) 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); 
  
            // Get the character 
            // to be read from the stream 
            int ch; 
  
            // Read the first character 
            // to this reader using read() method 
            // This will put the str in the stream 
            // till it is read by the reader 
            ch = pushbackReader.read(); 
            System.out.print((char)ch); 
  
            System.out.println(); 
  
            // skip 1 characters using skip(long) 
            pushbackReader.skip(1); 
  
            System.out.println("Next 1 characters skipped."); 
  
            // Read the next 1 character 
            // to this reader using read() method 
            for (int i = 0; i < 1; i++) { 
                ch = pushbackReader.read(); 
                System.out.print((char)ch); 
            } 
  
            System.out.println(); 
  
            // Close the stream 
            pushbackReader.close(); 
            System.out.println("Stream Closed."); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

G
Next 1 characters skipped.
G
Stream Closed.

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

相關用法

注：本文由純淨天空篩選整理自srinam大神的英文原創作品 PushbackReader skip(long) 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。