极客教程Java FloatBuffer slice()方法及实例
java.nio.FloatBuffer 类的 slice() 方法用于创建一个 新的Float缓冲区 ，其内容是给定缓冲区内容的共享子序列。 新缓冲区的内容将从这个缓冲区的当前位置开始。对这个缓冲区内容的改变将在新的缓冲区中可见，反之亦然。两个缓冲区的位置、极限和标记值将是独立的。
新缓冲区的位置将是0，其容量和极限将是这个缓冲区中剩余的浮点数，其标记将是未定义的。当且仅当这个缓冲区是直接的，新的缓冲区将是直接的，当且仅当这个缓冲区是只读的，它将是只读的。
语法:
public abstract FloatBuffer slice()
返回值： 该方法返回 新的Float缓冲区
以下是说明slice()方法的例子：
例子 1 :
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the FloatBuffer
int capacity = 10;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer
fb1.put(8.56F);
fb1.put(9.61F);
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb1.array()));
// print the FloatBuffer position
System.out.println("\nposition: " + fb1.position());
// print the FloatBuffer capacity
System.out.println("\ncapacity: " + fb1.capacity());
// Creating a shared subsequence buffer of given FloatBuffer
// using slice() method
FloatBuffer fb2 = fb1.slice();
// print the shared subsequence buffer
System.out.println("\nshared subsequence FloatBuffer: "
+ Arrays.toString(fb2.array()));
// print the FloatBuffer position
System.out.println("\nposition: " + fb2.position());
// print the FloatBuffer capacity
System.out.println("\ncapacity: " + fb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
输出
Original FloatBuffer: [8.56, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 2
capacity: 10
shared subsequence FloatBuffer: [8.56, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 0
capacity: 8
例子 2 :
// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the FloatBuffer
int capacity = 10;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer
fb1.put(8.56F);
fb1.put(9.61F);
fb1.put(0.56F);
fb1.put(3.61F);
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb1.array()));
// print the FloatBuffer position
System.out.println("\nposition: " + fb1.position());
// print the FloatBuffer capacity
System.out.println("\ncapacity: " + fb1.capacity());
// Creating a shared subsequence buffer of given FloatBuffer
// using slice() method
FloatBuffer fb2 = fb1.slice();
fb2.put(2.34F);
fb2.put(6.34F);
// print the shared subsequence buffer
System.out.println("\nshared subsequence FloatBuffer: "
+ Arrays.toString(fb2.array()));
// print the FloatBuffer position
System.out.println("\nposition: " + fb2.position());
// print the FloatBuffer capacity
System.out.println("\ncapacity: " + fb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
输出
Original FloatBuffer: [8.56, 9.61, 0.56, 3.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
position: 4
capacity: 10
shared subsequence FloatBuffer: [8.56, 9.61, 0.56, 3.61, 2.34, 6.34, 0.0, 0.0, 0.0, 0.0]
position: 2
capacity: 6