Java Reader skip(long)方法及示例

Java中Reader类的skip(long)方法是用来跳过流中指定的字符数的。这个数量的字符被指定为参数。如果它跳过的字符数达到了流的末端，它将阻塞流，直到获得一些字符，或者抛出IOException。

语法。

public long skip(long numberOfChar)

参数。该方法接受一个参数numberOfChar，它是该方法要跳过的字符数。

返回值。此方法返回一个长值，即此方法跳过的实际字符数。

异常情况。这个方法会抛出。

下面的方法说明了skip(long)方法的工作。

程序 1:

// Java program to demonstrate// Reader skip(long) method  import java.io.*;import java.util.*;  class GFG {    public static void main(String[] args)    {          try {              String str = "GeeksForGeeks";              // Create a Reader instance            Reader reader                = new StringReader(str);              // 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 = reader.read();                System.out.print((char)ch);            }              System.out.println();              // skip 3 characters using skip(long)            reader.skip(3);              System.out.println("Next 3 characters skipped.");              // Read the 5 characters            // to this reader using read() method            for (int i = 0; i < 5; i++) {                ch = reader.read();                System.out.print((char)ch);            }        }        catch (Exception e) {            System.out.println(e);        }    }}

输出:

GeeksNext 3 characters skipped.Geeks

程序2。

// Java program to demonstrate// Reader skip(long) method  import java.io.*;import java.util.*;  class GFG {    public static void main(String[] args)    {          try {            String str = "GeeksForGeeks";              // Create a Reader instance            Reader reader                = new StringReader(str);              // 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 = reader.read();                System.out.print((char)ch);            }              System.out.println();              // skip 10 characters using skip(long)            reader.skip(10);              // Read the 5 characters            // to this reader using read() method            for (int i = 0; i < 5; i++) {                ch = reader.read();                System.out.print((char)ch);            }        }        catch (Exception e) {            System.out.println(e);        }    }}

输出:

Geeks?????

参考资料: https://docs.oracle.com/javase/9/docs/api/java/io/Reader.html#skip-long-