java.nio.CharBuffer類的flip()方法用於翻轉此緩衝區。將限製設置為當前位置,然後將該位置設置為零。如果定義了標記,則將其丟棄。在序列完成channel-read或放置操作之後,調用此方法為序列進行準備的channel-write或相對get操作。
例如:
buf.put(magic); // Prepend header
in.read(buf); // Read data into rest of buffer
buf.flip(); // Flip buffer
out.write(buf); // Write header + data to channel
當將數據從一個地方傳輸到另一個地方時,通常將此方法與compact()方法結合使用。
用法:
public final CharBuffer flip()
返回值:此方法返回此緩衝區。
下麵是說明flip()方法的示例:
範例1:
// Java program to demonstrate
// flip() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declare and initialize the char array
char[] cb = { 'a', 'b', 'c' };
// wrap the char array into CharBuffer
// using wrap() method
CharBuffer charBuffe
r
= CharBuffer.wrap(cb);
// set position at index 1
charBuffer.position(1);
// print the char buffer
System.out.println("CharBuffer before flip:"
+ Arrays.toString(
charBuffer.array())
+ "\nPosition:"
+ charBuffer.position()
+ "\nLimit:"
+ charBuffer.limit());
// Flip the charBuffer
// using flip() method
charBuffer.flip();
// print the byte buffer
System.out.println("\nCharBuffer after flip:"
+ Arrays.toString(
charBuffer.array())
+ "\nPosition:"
+ charBuffer.position()
+ "\nLimit:"
+ charBuffer.limit());
}
}
輸出:
CharBuffer before flip:[a, b, c] Position:1 Limit:3 CharBuffer after flip:[a, b, c] Position:0 Limit:1
範例2:
// Java program to demonstrate
// flip() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// defining and allocating CharBuffer
// using allocate() method
CharBuffer charBuffer
= CharBuffer.allocate(4);
// append char value in charBuffer
// using append() method
charBuffer.append('a');
charBuffer.append('b');
// print the char buffer
System.out.println("CharBuffer before flip:"
+ Arrays.toString(
charBuffer.array())
+ "\nPosition:"
+ charBuffer.position()
+ "\nLimit:"
+ charBuffer.limit());
// Flip the charBuffer
// using flip() method
charBuffer.flip();
// print the char buffer
System.out.println("CharBuffer before flip:"
+ Arrays.toString(
charBuffer.array())
+ "\nPosition:"
+ charBuffer.position()
+ "\nLimit:"
+ charBuffer.limit());
}
}
輸出:
CharBuffer before flip:[a, b, c, ] Position:3 Limit:4 CharBuffer before flip:[a, b, c, ] Position:0 Limit:3
參考: https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#flip-
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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 CharBuffer flip() methods 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。