Java中的 FloatBuffer equals() 方法及示例
Java.nio.FloatBuffer类的equals()方法用于检查给定缓冲区是否等于另一个对象。
当且仅当，两个浮点缓冲区相等
- 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考虑，是逐点的
平等的。
此方法认为两个浮点元素 a 和 b 相等 if (a == b) || (Float.isNaN(a) && Float.isNaN(b))。与 Float.equals(Object) 不同，值 -0.0 和 +0.0 被认为是相等的。
浮动缓冲区不等于任何其他类型的对象。
句法：
public boolean equals(Object ob)参数：此方法将ob （与此缓冲区进行比较的对象）作为参数。
返回值：当且仅当此缓冲区等于给定对象时，此方法返回true 。
以下是说明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 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");
}
}
}
输出：
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
示例 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");
}
}
}
输出：
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
示例 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");
}
}
}
输出：
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