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Java IntBuffer get()方法用法及代碼示例


get()

java.nio.IntBuffer類的get()方法用於讀取給定緩衝區當前位置的int，然後遞增該位置。

用法:

public abstract int get()

返回值：此方法返回緩衝區當前位置的int值。



拋出：此方法拋出BufferUnderflowException-如果緩衝區的當前位置不小於其限製，則拋出此異常。

下麵是說明get()方法的示例：

範例1：

// Java program to demonstrate 
// get() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the IntBuffer 
        int capacity = 5; 
  
        // Creating the IntBuffer 
        try { 
  
            // creating object of Intbuffer 
            // and allocating size capacity 
            IntBuffer ib = IntBuffer.allocate(capacity); 
  
            // putting the value in Intbuffer 
            ib.put(8); 
            ib.put(9); 
            ib.put(1); 
            ib.rewind(); 
  
            // print the IntBuffer 
            System.out.println("Original IntBuffer:  "
                               + Arrays.toString(ib.array())); 
  
            // Reads the Int at this buffer's current position 
            // using get() method 
            int value = ib.get(); 
  
            // print the Int value 
            System.out.println("Int Value:" + value); 
  
            // Reads the  Int at this buffer's next position 
            // using get() method 
            int value1 = ib.get(); 
  
            // print the Int value 
            System.out.print("Next Int Value:" + value1); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
  
        catch (BufferUnderflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
輸出： 
Original IntBuffer: [8, 9, 1, 0, 0]
Int Value:8
Next Int Value:9

範例2：演示java.nio.BufferUnderflowException

// Java program to demonstrate 
// get() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the IntBuffer 
        int capacity = 3; 
  
        // Creating the IntBuffer 
        try { 
  
            // creating object of Intbuffer 
            // and allocating size capacity 
            IntBuffer ib = IntBuffer.allocate(capacity); 
  
            // putting the value in Intbuffer 
            ib.put(8); 
            ib.put(9); 
  
            // print the IntBuffer 
            System.out.println("Original IntBuffer:  "
                               + Arrays.toString(ib.array())); 
  
            // Reads the Int at this buffer's current position 
            // using get() method 
            int value = ib.get(); 
  
            // print the Int value 
            System.out.println("Int Value:" + value); 
  
            // Reads the  Int at this buffer's next position 
            // using get() method 
            System.out.print("Since the buffer current position is incremented"); 
            System.out.print(" to greater than its limit "); 
  
            int value1 = ib.get(); 
  
            // print the Int value 
            System.out.print("Next Int Value:" + value1); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
  
        catch (BufferUnderflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
輸出： 
Original IntBuffer: [8, 9, 0]
Int Value:0

Since the buffer current position is incremented to greater than its limit Exception throws:java.nio.BufferUnderflowException

get(int index)

IntBuffer的get(int index)方法用於讀取指定索引處的文章。

用法:

public abstract int get(int index)

參數：此方法將索引(將從中讀取int的索引)作為參數。

返回值：此方法返回給定索引處的int值。



異常：此方法引發IndexOutOfBoundsException。如果index為負或不小於緩衝區的限製，則拋出此異常。

以下示例說明了get(int index)方法：

範例1：

// Java program to demonstrate 
// get(int index) method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the IntBuffer 
        int capacity = 3; 
  
        // Creating the IntBuffer 
        try { 
  
            // creating object of Intbuffer 
            // and allocating size capacity 
            IntBuffer ib = IntBuffer.allocate(capacity); 
  
            // putting the value in Intbuffer 
            ib.put(8); 
            ib.put(9); 
            ib.put(6); 
  
            // print the IntBuffer 
            System.out.println("Original IntBuffer:  "
                               + Arrays.toString(ib.array())); 
  
            // Reads the Int at the index 0 of the Intbuffer 
            // using get() method 
            int value0 = ib.get(0); 
  
            // print the Int value 
            System.out.println("Int Value at index 0:" + value0); 
  
            // Reads the Int at the index 1 of the Intbuffer 
            // using get() method 
            int value1 = ib.get(1); 
  
            // print the Int value 
            System.out.println("Int Value at index 1:" + value1); 
  
            // Reads the Int at the index 2 of the Intbuffer 
            // using get() method 
            int value2 = ib.get(2); 
  
            // print the Int value 
            System.out.println("Int Value at index 2:" + value2); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("ReadOnlyBufferException catched"); 
        } 
  
        catch (BufferUnderflowException e) { 
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
輸出： 
Original IntBuffer: [8, 9, 6]
Int Value at index 0:8
Int Value at index 1:9
Int Value at index 2:6

範例2：演示IndexOutOfBoundsException

// Java program to demonstrate 
// get() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the IntBuffer 
        int capacity = 3; 
  
        // Creating the IntBuffer 
        try { 
  
            // creating object of Intbuffer 
            // and allocating size capacity 
            IntBuffer ib = IntBuffer.allocate(capacity); 
  
            // putting the value in Intbuffer 
            ib.put(6); 
            ib.put(8); 
            ib.put(12); 
  
            // print the IntBuffer 
            System.out.println("Original IntBuffer:  "
                               + Arrays.toString(ib.array())); 
  
            // Reads the Int at the index 0 of the Intbuffer 
            // using get() method 
            int value0 = ib.get(0); 
  
            // print the Int value 
            System.out.println("Int Value at index 0:" + value0); 
  
            // Reads the Int at the index 1 of the Intbuffer 
            // using get() method 
            int value1 = ib.get(1); 
  
            // print the Int value 
            System.out.println("Int Value at index 1:" + value1); 
  
            // Reads the Int at the index 2 of the Intbuffer 
            // using get() method 
            System.out.println("Trying to get the Int"
                               + " of index greater than its limit "); 
            int value2 = ib.get(4); 
  
            // print the Int value 
            System.out.println("Int Value at index 2:" + value2); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
  
            System.out.println("Exception thrown:" + e); 
        } 
  
        catch (BufferUnderflowException e) { 
  
            System.out.println("Exception throws:" + e); 
        } 
    } 
}
輸出： 
Original IntBuffer: [6, 8, 12]
Int Value at index 0:6
Int Value at index 1:8

Trying to get the Int of index greater than its limit 
Exception thrown:java.lang.IndexOutOfBoundsException



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注：本文由純淨天空篩選整理自nitin_sharma大神的英文原創作品 IntBuffer get() methods in Java | Set 1。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。