Java 中的 CharBuffer 数组()方法
原文:https://www . geesforgeks . org/char buffer-array-in-method-Java/
java.nio.CharBuffer 类的数组()方法用于返回支持该缓冲区的 char 数组。对此缓冲区内容所做的任何修改都会导致返回数组的内容也被修改，反之亦然。在调用此方法之前调用 hasArray()方法，以确保此缓冲区具有可访问的后备数组。
语法:
public final char[] array()
返回值:该方法返回支持该缓冲区的数组。
抛出:这个方法抛出readonlybufferenexception(如果这个缓冲区由数组支持，但是是只读的)
下面程序说明了数组()的方法:
例 1:
// Java program to demonstrate
// array() 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 cb = CharBuffer.allocate(capacity);
// putting the value in CharBuffer
cb.put('a');
cb.put(2, 'b');
cb.rewind();
// getting array from cb
// CharBuffer using array() method
char[] cbb = cb.array();
// printing the CharBuffer cb
System.out.println("CharBuffer: "
+ Arrays.toString(cbb));
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
CharBuffer: [a, , b, , , , , , , ]
例 2:
// Java program to demonstrate
// array() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the cb
int capacity1 = 10;
// Declaring the capacity of the cb1
int capacity2 = 5;
// Creating the CharBuffer
try {
//
// cb
//
// creating object of CharBuffer cb
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity1);
// putting the value in cb
cb.put('a');
cb.put(2, 'b');
cb.put(3, 'c');
cb.rewind();
// print the CharBuffer
System.out.println("CharBuffer cb: "
+ Arrays.toString(cb.array()));
//
// cb1
//
// creating object of CharBuffer cb1
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity2);
// putting the value in cb1
cb1.put(1, 'd');
cb1.put(2, 'e');
cb1.rewind();
// print the CharBuffer
System.out.println("\nCharBuffer cb1: "
+ Arrays.toString(cb1.array()));
// Creating a read-only copy of CharBuffer
// using asReadOnlyBuffer() method
CharBuffer readOnlycb = cb.asReadOnlyBuffer();
// print the CharBuffer
System.out.print("\nReadOnlyBuffer CharBuffer: ");
while (readOnlycb.hasRemaining())
System.out.print(readOnlycb.get() + ", ");
// try to change readOnlycb
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlycb for editing");
char[] cbarr = readOnlycb.array();
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
CharBuffer cb: [a,, b, c,,,,,, ]
CharBuffer cb1: [, d, e,, ]
ReadOnlyBuffer CharBuffer: a,, b, c,,,,,,,
Trying to get the array from ReadOnlycb for editing
Exception thrown: java.nio.ReadOnlyBufferException
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