Java 中的 LongBuffer flip()方法，带示例
原文:https://www . geesforgeks . org/longbuffer-flip-method-in-Java-with-examples/
java.nio.LongBuffer 类 的翻转()方法用于翻转该缓冲区。翻转该缓冲区意味着
- The buffer will be trimmed to the current position.
- , and then the position will be changed to zero.
- If there is any tag on the buffer, the tag will be automatically discarded.
语法:
public final LongBuffer flip()
参数:此方法不接受任何参数。
返回值:该方法返回翻转的龙虎符实例。
下面是一些示例来说明 flip()方法:
示例 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 long array
long[] db
= { 10, 20, 30 };
// wrap the long array
// into LongBuffer
// using wrap() method
LongBuffer longBuffer
= LongBuffer.wrap(db);
// set position at index 1
longBuffer.position(1);
// print the buffer
System.out.println(
"Buffer before flip: "
+ Arrays.toString(
longBuffer.array())
+ "\nPosition: "
+ longBuffer.position()
+ "\nLimit: "
+ longBuffer.limit());
// Flip the Buffer
// using flip() method
longBuffer.flip();
// print the buffer
System.out.println(
"\nBuffer after flip: "
+ Arrays.toString(
longBuffer.array())
+ "\nPosition: "
+ longBuffer.position()
+ "\nLimit: "
+ longBuffer.limit());
}
}
输出:
Buffer before flip: [10, 20, 30]
Position: 1
Limit: 3
Buffer after flip: [10, 20, 30]
Position: 0
Limit: 1
示例 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 LongBuffer
// using allocate() method
LongBuffer longBuffer
= LongBuffer.allocate(4);
// put long value in LongBuffer
// using put() method
longBuffer.put(20);
longBuffer.put(34);
// set position at index 1
longBuffer.position(1);
// print the buffer
System.out.println(
"Buffer before flip: "
+ Arrays.toString(
longBuffer.array())
+ "\nPosition: "
+ longBuffer.position()
+ "\nLimit: "
+ longBuffer.limit());
// Flip the Buffer
// using flip() method
longBuffer.flip();
// print the buffer
System.out.println(
"\nBuffer after flip: "
+ Arrays.toString(
longBuffer.array())
+ "\nPosition: "
+ longBuffer.position()
+ "\nLimit: "
+ longBuffer.limit());
}
}
输出:
Buffer before flip: [20, 34, 0, 0]
Position: 1
Limit: 4
Buffer after flip: [20, 34, 0, 0]
Position: 0
Limit: 1
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/longbuffer . html # mark–
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