Java CharBuffer equals()方法

java.nio.CharBuffer 类的 equals() 方法用于检查给定的缓冲区是否与另一个对象相等。

两个char缓冲区是相等的，当且仅当。

• 它们具有相同的元素类型。
• 它们有相同数量的剩余元素，并且
• 两个剩余元素的序列，独立考虑它们的起始位置，是点状的 。

这个方法认为两个char元素’a’和’b’是相等的，如果(‘a’ == ‘b’) || (Char.isNaN(a) && Char.isNaN(b)) 。值-0和+0被认为是相等的，与Char.eals(Object)不同。

一个char缓冲区不等于任何其他类型的对象。

语法

public boolean equals(Object ob)

参数： 该方法以 ob （这个缓冲区要被比较的对象）为参数。

返回值： 当且仅当这个缓冲区等于给定的对象时，该方法返回真。

下面是说明 equals() 方法的例子。

例子 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

例子 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

例子 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