Java 中的 CharBuffer flip()方法，示例
原文:https://www . geesforgeks . org/char buffer-flip-methods-in-Java-with-examples/
java.nio.CharBuffer 类 的翻转()方法用于翻转该缓冲区。极限被设置为当前位置，然后位置被设置为零。如果标记被定义，那么它被丢弃。在一系列通道读取或放置操作之后，调用此方法为一系列通道写入或相关的获取操作做准备。
例如:
buf.put(魔法)；//前置表头 in . read(buf)；//将数据读入缓冲区的剩余部分 buf . flip()；//翻转缓冲区 out . write(buf)；//将标题+数据写入通道
当从一个地方向另一个地方传输数据时，此方法通常与 compact()方法结合使用。
语法:
public final CharBuffer flip()
返回值:这个方法返回这个缓冲区。
下面是一些示例来说明 flip()方法:
实施例 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());
}
}
Output:
CharBuffer before flip: [a, b, c]
Position: 1
Limit: 3
CharBuffer after flip: [a, b, c]
Position: 0
Limit: 1
实施例 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());
}
}
Output:
CharBuffer before flip: [a, b, c, ]
Position: 3
Limit: 4
CharBuffer before flip: [a, b, c, ]
Position: 0
Limit: 3
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/charbuffer . html # flip–
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