Java 中的 CharBuffer put()方法
原文:https://www . geesforgeks . org/char buffer-put-methods-in-Java/
put(char i)
java.nio.CharBuffer 类的 put(char i) 方法用于将给定字符写入当前位置新创建的 char 缓冲区，然后增加位置。
语法:
public abstract CharBuffer put(char i)
参数:该方法将字符值 i 作为参数写入字符缓冲区。
返回值:这个方法返回这个缓冲区，其中插入了字符值。
异常:此方法抛出以下异常:
- Bufferovflowexception- If the current position of this buffer is not less than its limit
- ReadonlyBufferenexception- If this buffer is read-only,
以下是举例说明 put(char i)方法的例子:
例 1:
爪哇
// Java program to demonstrate
// put(char i) method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer using put() method
cb.put('a');
cb.put('b');
cb.put('c');
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出:
Original CharBuffer: [a, b, c]
例 2: 演示 BufferOverflowException。
Java
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(capacity);
// putting the value in Charbuffer using put() method
cb.put('a');
cb.put('b');
cb.put('c');
System.out.println("Trying to put the Int at the "
+ "position more than its limit");
cb.put('d');
// rewind the Charbuffer
cb.rewind();
// print the CharBuffer
System.out.println("Original CharBuffer: "
+ Arrays.toString(cb.array()));
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出:
Trying to put the Int at the position more than its limit
Exception throws : java.nio.BufferOverflowException
示例 3: 演示 ReadOnlyBufferException。
爪哇
// Java program to demonstrate
// put() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer
int capacity = 3;
// Creating the CharBuffer
try {
// creating object of Charbuffer
// and allocating size capacity using allocate() method
CharBuffer cb = CharBuffer.allocate(capacity);
// Creating a read-only copy of CharBuffer
// using asReadOnlyBuffer() method
CharBuffer cb1 = cb.asReadOnlyBuffer();
System.out.println("Trying to put the Int value"
+ " in read only buffer");
// putting the value in readonly Charbuffer
// using put() method
cb1.put('a');
}
catch (BufferOverflowException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出:
Trying to put the Int value in read only buffer
Exception throws : java.nio.ReadOnlyBufferException
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