Java中的PushbackReader類的skip(long)方法用于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。

下面的方法說明了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.

總結

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