Java 中的 Reader skip(long)方法，示例

原文:https://www . geesforgeks . org/reader-skip long-method-in-Java-with-examples/

Java 中 Reader 类的跳过(长)方法用于跳过流中指定数量的字符。这个字符数被指定为参数。如果它通过跳过到达流的末尾，它将阻塞流，直到它得到一些字符，或者抛出 IOException。

语法:

public long skip(long numberOfChar)

参数:这个方法接受一个参数 numberOfChar ，这是这个方法要跳过的字符数。

返回值:该方法返回一个长值，即该方法实际跳过的字符数。

异常:如果在输入输出

  • There are some errors in **. This method throws:

    • Exception: If the number of Char passed is negative,**

下面的方法说明了跳(长)法的工作原理:

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:

Geeks
Next 3 characters skipped.
Geeks

程序二:

// 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:https://docs . Oracle . com/javase/9/docs/API/Java/io/reader . html # skip-long-

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