Java 中的 CharBuffer equals()方法
原文:https://www . geesforgeks . org/char buffer-equals-method-in-Java/
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。
当且仅当两个字符缓冲区相等时，
- 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
- 剩余元素的两个序列，独立于它们的起始位置，是逐点相等的 。
如果(' a ' = ' b ')| |(char . isnan(a)和& Char.isNaN(b))，此方法认为两个字符元素' a '和' b '相等。与 Char.equals(对象)不同，值-0 和+0 被认为是相等的。
字符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 (该缓冲区要与之比较的对象)为参数。
返回值:当且仅当该缓冲区等于给定对象时，该方法返回真。
以下是说明等于()方法的示例:
实施例 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");
}
}
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
CharBuffer 2: [a,, b,,,,,,, ]
Both are equal
实施例 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");
}
}
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
CharBuffer 2: [a,, b,, ]
Both are not equal
实施例 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");
}
}
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
CharBuffer 2: [a,, b, c, d,,,,, ]
Both are not equal
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