Java 中的 CharBuffer slice()方法
原文:https://www . geesforgeks . org/charbuffer-slice-method-in-Java/
slice() 方法的 java.nio.charBuffer 类用于创建一个新的 char buffer ，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该缓冲区的当前位置开始。新的缓冲区将显示缓冲区内容的变化，反之亦然。两个缓冲器的位置、极限和标记值将是独立的。
新缓冲区的位置将为零，其容量和限制将是该缓冲区中剩余的整数数量，其标记将是未定义的。如果且仅当，此缓冲区是直接的，那么新缓冲区将是直接的，并且当且仅当，此缓冲区是只读的时，它将是只读的。
语法:
public abstract CharBuffer slice()
返回值:该方法返回新的字符缓冲区。
下面是说明 slice()方法的示例:
例 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 CharBuffer
int capacity = 10;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity);
// putting the value in intbuffer
cb1.put('a');
cb1.put('b');
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb1.array()));
// print the CharBuffer position
System.out.println("position: " + cb1.position());
// print the CharBuffer capacity
System.out.println("capacity: " + cb1.capacity());
// Creating a shared subsequance buffer of given CharBuffer
// using slice() method
CharBuffer cb2 = cb1.slice();
// print the shared subsequance buffer
System.out.println("shared subsequance CharBuffer: "
+ Arrays.toString(cb2.array()));
// print the CharBuffer position
System.out.println("position: " + cb2.position());
// print the CharBuffer capacity
System.out.println("capacity: " + cb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original CharBuffer: [a, b, , , , , , , , ]
position: 2
capacity: 10
shared subsequance CharBuffer: [a, b, , , , , , , , ]
position: 0
capacity: 8
例 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 CharBuffer
int capacity = 10;
// Creating the CharBuffer
try {
// creating object of charbuffer
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity);
// putting the value in floatbuffer
cb1.put('a');
cb1.put('b');
cb1.put('c');
cb1.put('d');
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb1.array()));
// print the CharBuffer position
System.out.println("position: " + cb1.position());
// print the CharBuffer capacity
System.out.println("capacity: " + cb1.capacity());
// Creating a shared subsequance buffer of given CharBuffer
// using slice() method
CharBuffer cb2 = cb1.slice();
cb2.put('k');
cb2.put('l');
// print the shared subsequance buffer
System.out.println("shared subsequance CharBuffer: "
+ Arrays.toString(cb2.array()));
// print the CharBuffer position
System.out.println("position: " + cb2.position());
// print the CharBuffer capacity
System.out.println("capacity: " + cb2.capacity());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original CharBuffer: [a, b, c, d, , , , , , ]
position: 4
capacity: 10
shared subsequance CharBuffer: [a, b, c, d, k, l, , , , ]
position: 2
capacity: 6
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