Java 中的 CharBuffer 重复()方法
原文:https://www . geesforgeks . org/char buffer-replicate-in-method-Java/
java.nio.CharBuffer 类的replicate()方法用于创建共享给定缓冲区内容的新的 char buffer 。
新缓冲区的内容将是该缓冲区的内容。对此缓冲区内容的更改将在新缓冲区中可见，反之亦然；两个缓冲器的位置、极限和标记值将是独立的。
新缓冲区的容量、限制、位置和标记值将与该缓冲区相同。如果且仅当该缓冲区是直接的，则新缓冲区将是直接的；如果且仅当该缓冲区是只读的，则新缓冲区将是只读的。
语法:
public abstract CharBuffer duplicate()
返回值:该方法返回新的 char 缓冲区，其携带以前的 char 缓冲区内容
以下是说明复制()方法的示例:
实施例 1: 使用直接 charbuffer
// Java program to demonstrate
// duplicate() method
// Using direct intbuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 10;
// Creating the CharBuffer
try {
// creating object of Intbuffer
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity);
// putting the value in Intbuffer
cb1.put('a');
cb1.put(2, 'b');
cb1.rewind();
// print the Original CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb1.array()));
// Creating a duplicate copy of CharBuffer
// using duplicate() method
CharBuffer cb2 = cb1.duplicate();
// print the duplicate copy of CharBuffer
System.out.print("Duplicate CharBuffer: "
+ Arrays.toString(cb2.array()));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original CharBuffer: [a, , b, , , , , , , ]
Duplicate CharBuffer: [a, , b, , , , , , , ]
示例 2: 使用只读 intbuffer
// Java program to demonstrate
// duplicate() method
// using read-onlyIntbuffer
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 10;
// Creating the CharBuffer
try {
// creating object of Intbuffer
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity);
// putting the value in Intbuffer
cb1.put('a');
cb1.put(2, 'b');
cb1.rewind();
// print the Original CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb1.array()));
// Creating a read-only copy of CharBuffer
// using asReadOnlyBuffer() method
CharBuffer readonly = cb1.asReadOnlyBuffer();
// print the read-only copy of CharBuffer
System.out.print("read-only CharBuffer: ");
while (readonly.hasRemaining())
System.out.print(readonly.get() + ", ");
System.out.println("");
// Rewinding the readonly CharBuffer
readonly.rewind();
// Creating a duplicate copy of CharBuffer
// using duplicate() method
CharBuffer cb2 = readonly.duplicate();
// print the duplicate copy of CharBuffer
System.out.print("duplicate copy of read-only CharBuffer: ");
while (cb2.hasRemaining())
System.out.print(cb2.get() + ", ");
System.out.println("");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original CharBuffer: [a, , b, , , , , , , ]
read-only CharBuffer: a, , b, , , , , , , ,
duplicate copy of read-only CharBuffer: a, , b, , , , , , , ,
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