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Java DoubleBuffer equals()用法及代碼示例


java.nio.DoubleBuffer類的equals()方法用於檢查給定的緩衝區是否等於另一個對象。

當且僅當兩個雙緩衝區相等時，

  • 它們具有相同的元素類型，
  • 它們具有相同數量的剩餘元素，並且
  • 其餘元素的兩個序列(與它們的起始位置無關)是按點排列的
    等於。

如果(a == b)||，則此方法認為兩個雙元素a和b相等。 (Double.isNaN(a)&& Double.isNaN(b))。與Double.equals(Object)不同，值-0.0和+0.0被視為相等。


一個雙緩衝區不等於任何其他類型的對象。

用法:

public boolean equals(Object ob)

參數：此方法將ob(與該緩衝區進行比較的對象)作為參數。

返回值：僅當此緩衝區等於給定對象時，此方法返回true。

下麵是說明equals()方法的示例：

示例1:

// Java program to demonstrate 
// equals() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the  DoubleBuffer 2 
        int capacity2 = 10; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 1 
            // and allocating size capacity 
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity1); 
  
            // creating object of Doublebuffer 2 
            // and allocating size capacity 
            DoubleBuffer db2 = DoubleBuffer.allocate(capacity2); 
  
            // putting the value in Doublebuffer 1 
            db1.put(8.56F); 
            db1.put(2, 9.61F); 
            db1.rewind(); 
  
            // putting the value in Doublebuffer 2 
            db2.put(8.56F); 
            db2.put(2, 9.61F); 
            db2.rewind(); 
  
            // print the DoubleBuffer 1 
            System.out.println(" DoubleBuffer 1:  "
                               + Arrays.toString(db1.array())); 
  
            // print the DoubleBuffer 2 
            System.out.println(" DoubleBuffer 2:  "
                               + Arrays.toString(db2.array())); 
  
            // checking the equality of both DoubleBuffer 
            boolean dbb = db1.equals(db2); 
  
            // checking if else condition 
            if (dbb) 
                System.out.println("both are equal"); 
            else
                System.out.println("both are not equal"); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}
輸出： 
DoubleBuffer 1:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 DoubleBuffer 2:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
both are equal

示例1:

// Java program to demonstrate 
// equals() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the  DoubleBuffer 2 
        int capacity2 = 5; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 1 
            // and allocating size capacity 
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity1); 
  
            // creating object of Doublebuffer 2 
            // and allocating size capacity 
            DoubleBuffer db2 = DoubleBuffer.allocate(capacity2); 
  
            // putting the value in Doublebuffer 1 
            db1.put(8.56F); 
            db1.put(2, 9.61F); 
            db1.rewind(); 
  
            // putting the value in Doublebuffer 2 
            db2.put(8.56F); 
            db2.put(2, 9.61F); 
            db2.rewind(); 
  
            // print the DoubleBuffer 1 
            System.out.println(" DoubleBuffer 1:  "
                               + Arrays.toString(db1.array())); 
  
            // print the DoubleBuffer 2 
            System.out.println(" DoubleBuffer 2:  "
                               + Arrays.toString(db2.array())); 
  
            // checking the equality of both DoubleBuffer 
            boolean dbb = db1.equals(db2); 
  
            // checking if else condition 
            if (dbb) 
                System.out.println("both are equal"); 
            else
                System.out.println("both are not equal"); 
        } 
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}
輸出： 
DoubleBuffer 1:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 DoubleBuffer 2:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0]
both are not equal


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注：本文由純淨天空篩選整理自pawan_asipu大神的英文原創作品 DoubleBuffer equals() method in Java with Examples。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。