极客教程Java FloatBuffer equals()方法及示例
java.nio.FloatBuffer 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Float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，独立于其起始位置考虑，是点状的 。
这个方法认为两个Float元素a和b是相等的，如果（a == b）||（Float.isNaN(a) && Float.isNaN(b)）。值-0.0和+0.0被认为是相等的，与Float.equals(Object)不同。
Float缓冲器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 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
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 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
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 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