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Java CharBuffer put()用法及代码示例


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的新创建的char缓冲区中，然后递增该位置。

用法:

public abstract CharBuffer put(char i)

参数：此方法将char值i作为要写入char缓冲区的参数。


返回值：此方法返回此缓冲区，在其中插入char值。

异常：此方法引发以下异常：

  • BufferOverflowException-如果此缓冲区的当前位置不小于其限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

以下是说明put(char i)方法的示例：

范例1：

// 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'); 
            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]

范例2：演示BufferOverflowException。

// 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

范例3：演示ReadOnlyBufferException。

// 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

put(int index, char i)

java.nio.CharBuffer类的put(int index，char i)方法用于将给定的int写入给定索引处的缓冲区。


用法:

public abstract CharBuffer put(int index, char i)

参数：此方法将以下参数作为参数：

  • index：将要写入char的索引
  • i：要写入的char值

返回值：此方法返回此缓冲区。

异常：此方法引发以下异常：

  • IndexOutOfBoundsException-如果索引为负或不小于缓冲区的限制
  • ReadOnlyBufferException-如果此缓冲区是只读的

以下示例说明了put(int index，char i)方法：

范例1：

// 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() at index 0 
            cb.put(0, 'a'); 
  
            // putting the value in Charbuffer using put() at index 2 
            cb.put(2, 'c'); 
  
            // putting the value in Charbuffer using put() at index 1 
            cb.put(1, 'b'); 
  
            // rewinding the Charbuffer 
            cb.rewind(); 
  
            // print the CharBuffer 
            System.out.println("Original CharBuffer:"
                               + Arrays.toString(cb.array())); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Original CharBuffer:[a, b, c]

范例2：演示IndexOutOfBoundsException。

// 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() at index 0 
            cb.put(0, 'c'); 
  
            // putting the value in Charbuffer 
            // using put() at index 2 
            cb.put(2, 'b'); 
  
            // putting the value in Charbuffer 
            // using put() at index -1 
            System.out.println("Trying to put the value"
                               + " at the negative index"); 
            cb.put(-1, 'a'); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
输出： 
Trying to put the value at the negative index
Exception throws:java.lang.IndexOutOfBoundsException

范例3：演示ReadOnlyBufferException。

// 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(0, '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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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CharBuffer put() methods in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。