Java DoubleBuffer duplicate()方法及示例
java.nio.DoubleBuffer 类的 replicate() 方法用于创建一个新的浮动缓冲区,共享给定的缓冲区的内容。
新的缓冲区的内容将是这个缓冲区的内容。这个缓冲区的内容的变化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。
新缓冲区的容量、极限、位置和标记值将与这个缓冲区的相同。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 DoubleBuffer duplicate()
返回值: 该方法返回 新的双缓冲区 ,该缓冲区承载了之前的双缓冲区内容。
下面是一些例子来说明double()方法。
程序1:
// Java program to demonstrate
// duplicate() method
// Using direct Doublebuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db1.put(8.56F);
db1.put(2, 9.61F);
db1.rewind();
// print the Original DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db1.array()));
// Creating a duplicate copy of DoubleBuffer
// using duplicate() method
DoubleBuffer db2 = db1.duplicate();
// print the duplicate copy of DoubleBuffer
System.out.print("\nDuplicate DoubleBuffer: "
+ Arrays.toString(db2.array()));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
输出:
Original DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
Duplicate DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
例2 :
// Java program to demonstrate
// duplicate() method
// using read-onlyDoublebuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the DoubleBuffer
int capacity = 10;
// Creating the DoubleBuffer
try {
// creating object of Doublebuffer
// and allocating size capacity
DoubleBuffer db1 = DoubleBuffer.allocate(capacity);
// putting the value in Doublebuffer
db1.put(8.56F);
db1.put(2, 9.61F);
db1.rewind();
// print the Original DoubleBuffer
System.out.println("Original DoubleBuffer: "
+ Arrays.toString(db1.array()));
// Creating a read-only copy of DoubleBuffer
// using asReadOnlyBuffer() method
DoubleBuffer readonly = db1.asReadOnlyBuffer();
// print the read-only copy of DoubleBuffer
System.out.print("\nread-only DoubleBuffer: ");
while (readonly.hasRemaining())
System.out.print(readonly.get() + ", ");
System.out.println("");
// Rewinding the readonly DoubleBuffer
readonly.rewind();
// Creating a duplicate copy of DoubleBuffer
// using duplicate() method
DoubleBuffer db2 = readonly.duplicate();
// print the duplicate copy of DoubleBuffer
System.out.print("\nduplicate copy of read-only DoubleBuffer: ");
while (db2.hasRemaining())
System.out.print(db2.get() + ", ");
System.out.println("");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
输出:
Original DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
read-only DoubleBuffer: 8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
duplicate copy of read-only DoubleBuffer: 8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,