Java 中的 IntBuffer flip()方法，示例
原文:https://www . geesforgeks . org/int buffer-flip-method-in-Java-with-examples/
java.nio.IntBuffer 类 的 flip() 方法用来翻转这个缓冲区。通过翻转该缓冲区，这意味着缓冲区将被修剪到当前位置，然后该位置将被更改为零。在此过程中，如果缓冲区上有任何标记，则该标记将被自动丢弃。
语法:
public final IntBuffer flip()
参数:该方法不取任何参数。
返回值:这个方法返回翻转后的 IntBuffer 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 int array
int[] ib
= { 10, 20, 30 };
// wrap the int array
// into IntBuffer
// using wrap() method
IntBuffer intBuffer
= IntBuffer.wrap(ib);
// set position at index 1
intBuffer.position(1);
// print the buffer
System.out.println(
"Buffer before flip: "
+ Arrays.toString(
intBuffer.array())
+ "\nPosition: "
+ intBuffer.position()
+ "\nLimit: "
+ intBuffer.limit());
// Flip the Buffer
// using flip() method
intBuffer.flip();
// print the buffer
System.out.println(
"\nBuffer after flip: "
+ Arrays.toString(
intBuffer.array())
+ "\nPosition: "
+ intBuffer.position()
+ "\nLimit: "
+ intBuffer.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 IntBuffer
// using allocate() method
IntBuffer intBuffer
= IntBuffer.allocate(4);
// put int value in IntBuffer
// using put() method
intBuffer.put(20);
intBuffer.put(34);
// set position at index 1
intBuffer.position(1);
// print the buffer
System.out.println(
"Buffer before flip: "
+ Arrays.toString(
intBuffer.array())
+ "\nPosition: "
+ intBuffer.position()
+ "\nLimit: "
+ intBuffer.limit());
// Flip the Buffer
// using flip() method
intBuffer.flip();
// print the buffer
System.out.println(
"\nBuffer after flip: "
+ Arrays.toString(
intBuffer.array())
+ "\nPosition: "
+ intBuffer.position()
+ "\nLimit: "
+ intBuffer.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/intbuffer . html # flip–
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