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Java CharBuffer equals()用法及代码示例


java.nio.CharBuffer类的equals()方法用于检查给定的缓冲区是否等于另一个对象。

当且仅当两个char缓冲区相等时，

  • 它们具有相同的元素类型，
  • 它们具有相同数量的剩余元素，并且
  • 其余元素的两个序列(与它们的起始位置无关)是按点排列的
    等于。

如果('a'=='b')||，此方法认为两个字符元素'a'和'b'相等。 (CharsisNaN(a)&& Char.isNaN(b))。与Char.equals(Object)不同，值-0和+0被视为相等。


字符缓冲区不等于任何其他类型的对象。

用法:

public boolean equals(Object ob)

参数：此方法将ob(此缓冲区要与之比较的对象)作为参数。

返回值：仅当此缓冲区等于给定对象时，此方法返回true。

下面是说明equals()方法的示例：

范例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 CharBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the CharBuffer 2 
        int capacity2 = 10; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of Charbuffer 1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // creating object of Charbuffer 2 
            // and allocating size capacity 
            CharBuffer cb2 = CharBuffer.allocate(capacity2); 
  
            // putting the value in Charbuffer 1 
            cb1.put('a'); 
            cb1.put(2, 'b'); 
            cb1.rewind(); 
  
            // putting the value in Charbuffer 2 
            cb2.put('a'); 
            cb2.put(2, 'b'); 
            cb2.rewind(); 
  
            // print the CharBuffer 1 
            System.out.println(" CharBuffer 1: "
                               + Arrays.toString(cb1.array())); 
  
            // print the CharBuffer 2 
            System.out.println(" CharBuffer 2: "
                               + Arrays.toString(cb2.array())); 
  
            // checking the equality of both CharBuffer 
            boolean cbb = cb1.equals(cb2); 
  
            // checking if else condition 
            if (cbb) 
                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"); 
        } 
    } 
}
输出： 
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b,,,,,,, ]
Both are equal

范例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 CharBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the CharBuffer 2 
        int capacity2 = 5; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of Charbuffer 1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // creating object of Charbuffer 2 
            // and allocating size capacity 
            CharBuffer cb2 = CharBuffer.allocate(capacity2); 
  
            // putting the value in Charbuffer 1 
            cb1.put('a'); 
            cb1.put(2, 'b'); 
            cb1.rewind(); 
  
            // putting the value in Charbuffer 2 
            cb2.put('a'); 
            cb2.put(2, 'b'); 
            cb2.rewind(); 
  
            // print the CharBuffer 1 
            System.out.println(" CharBuffer 1: "
                               + Arrays.toString(cb1.array())); 
  
            // print the CharBuffer 2 
            System.out.println(" CharBuffer 2: "
                               + Arrays.toString(cb2.array())); 
  
            // checking the equality of both CharBuffer 
            boolean cbb = cb1.equals(cb2); 
  
            // checking if else condition 
            if (cbb) 
                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"); 
        } 
    } 
}
输出： 
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b,, ]
Both are not equal

范例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 CharBuffer 1 
        int capacity1 = 10; 
  
        // Declaring the capacity of the CharBuffer 2 
        int capacity2 = 10; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of Charbuffer 1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // creating object of Charbuffer 2 
            // and allocating size capacity 
            CharBuffer cb2 = CharBuffer.allocate(capacity2); 
  
            // putting the value in Charbuffer 1 
            cb1.put('a'); 
            cb1.put(2, 'b'); 
            cb1.rewind(); 
  
            // putting the value in Charbuffer 2 
            cb2.put('a'); 
            cb2.put(2, 'b'); 
            cb2.put(3, 'c'); 
            cb2.put(4, 'd'); 
            cb2.rewind(); 
  
            // print the CharBuffer 1 
            System.out.println(" CharBuffer 1: "
                               + Arrays.toString(cb1.array())); 
  
            // print the CharBuffer 2 
            System.out.println(" CharBuffer 2: "
                               + Arrays.toString(cb2.array())); 
  
            // checking the equality of both CharBuffer 
            boolean cbb = cb1.equals(cb2); 
  
            // checking if else condition 
            if (cbb) 
                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"); 
        } 
    } 
}
输出： 
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b, c, d,,,,, ]
Both are not equal


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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 equals() method 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。