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Java FloatBuffer equals()用法及代碼示例


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

當且僅當兩個浮點緩衝區相等時，

  • 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)||，則此方法認為兩個浮點元素a和b相等。 (Float.isNaN(a)&& Float.isNaN(b))。與Float.equals(Object)不同，值-0.0和+0.0被視為相等。


浮點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(此緩衝區要與之比較的對象)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：

範例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 FloatBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the  FloatBuffer 2 
        int capacity2 = 10; 
  
        // Creating the FloatBuffer 
        try { 
  
            // creating object of floatbuffer 1 
            // and allocating size capacity 
            FloatBuffer fb1 = FloatBuffer.allocate(capacity1); 
  
            // creating object of floatbuffer 2 
            // and allocating size capacity 
            FloatBuffer fb2 = FloatBuffer.allocate(capacity2); 
  
            // putting the value in floatbuffer 1 
            fb1.put(8.56F); 
            fb1.put(2, 9.61F); 
            fb1.rewind(); 
  
            // putting the value in floatbuffer 2 
            fb2.put(8.56F); 
            fb2.put(2, 9.61F); 
            fb2.rewind(); 
  
            // print the FloatBuffer 1 
            System.out.println(" FloatBuffer 1:  "
                               + Arrays.toString(fb1.array())); 
  
            // print the FloatBuffer 2 
            System.out.println(" FloatBuffer 2:  "
                               + Arrays.toString(fb2.array())); 
  
            // checking the equality of both FloatBuffer 
            boolean fbb = fb1.equals(fb2); 
  
            // checking if else condition 
            if (fbb) 
                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： 
FloatBuffer 1:  [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
FloatBuffer 2:  [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
both are equal

範例2：

// 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 FloatBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the  FloatBuffer 2 
        int capacity2 = 5; 
  
        // Creating the FloatBuffer 
        try { 
  
            // creating object of floatbuffer 1 
            // and allocating size capacity 
            FloatBuffer fb1 = FloatBuffer.allocate(capacity1); 
  
            // creating object of floatbuffer 2 
            // and allocating size capacity 
            FloatBuffer fb2 = FloatBuffer.allocate(capacity2); 
  
            // putting the value in floatbuffer 1 
            fb1.put(8.56F); 
            fb1.put(2, 9.61F); 
            fb1.rewind(); 
  
            // putting the value in floatbuffer 2 
            fb2.put(8.56F); 
            fb2.put(2, 9.61F); 
            fb2.rewind(); 
  
            // print the FloatBuffer 1 
            System.out.println(" FloatBuffer 1:  "
                               + Arrays.toString(fb1.array())); 
  
            // print the FloatBuffer 2 
            System.out.println(" FloatBuffer 2:  "
                               + Arrays.toString(fb2.array())); 
  
            // checking the equality of both FloatBuffer 
            boolean fbb = fb1.equals(fb2); 
  
            // checking if else condition 
            if (fbb) 
                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： 
FloatBuffer 1:  [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
FloatBuffer 2:  [8.56, 0.0, 9.61, 0.0, 0.0]
both are not equal

範例3：

// 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 FloatBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the  FloatBuffer 2 
        int capacity2 = 10; 
  
        // Creating the FloatBuffer 
        try { 
  
            // creating object of floatbuffer 1 
            // and allocating size capacity 
            FloatBuffer fb1 = FloatBuffer.allocate(capacity1); 
  
            // creating object of floatbuffer 2 
            // and allocating size capacity 
            FloatBuffer fb2 = FloatBuffer.allocate(capacity2); 
  
            // putting the value in floatbuffer 1 
            fb1.put(8.56F); 
            fb1.put(2, 9.61F); 
            fb1.rewind(); 
  
            // putting the value in floatbuffer 2 
            fb2.put(8.56F); 
            fb2.put(2, 9.61F); 
            fb2.put(3, 7.861F); 
            fb2.put(4, 4.31F); 
            fb2.rewind(); 
  
            // print the FloatBuffer 1 
            System.out.println(" FloatBuffer 1:  "
                               + Arrays.toString(fb1.array())); 
  
            // print the FloatBuffer 2 
            System.out.println(" FloatBuffer 2:  "
                               + Arrays.toString(fb2.array())); 
  
            // checking the equality of both FloatBuffer 
            boolean fbb = fb1.equals(fb2); 
  
            // checking if else condition 
            if (fbb) 
                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： 
FloatBuffer 1:  [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
FloatBuffer 2:  [8.56, 0.0, 9.61, 7.861, 4.31, 0.0, 0.0, 0.0, 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RohitPrasad3大神的英文原創作品 FloatBuffer 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。