Java中的 FloatBuffer compareTo() 方法及示例
Java.nio.FloatBuffer类的compareTo()方法用于将一个缓冲区与另一个缓冲区进行比较。通过按字典顺序比较它们的剩余元素序列来比较两个浮点缓冲区，而不考虑每个序列在其相应缓冲区中的起始位置。对浮点元素进行比较，就像通过调用 Float.compare(float, float) 一样，除了 -0.0 和 0.0 被认为是相等的。此方法认为 Float.NaN 等于其自身并且大于所有其他浮点值（包括 Float.POSITIVE_INFINITY）。浮动缓冲区无法与任何其他类型的对象进行比较。
句法 ：
public int compareTo(FloatBuffer that)参数：此方法将浮点缓冲区对象作为参数，与此缓冲区进行比较。
返回值：此方法返回负整数、零或正整数，因为此缓冲区小于、等于或大于给定缓冲区。
以下是说明 compareTo() 方法的示例：
示例 1：当两个 FloatBuffer 相等时。
// Java program to demonstrate
// compareTo() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the fb
int capacity1 = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer fb
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity1);
// putting the value in fb
fb.put(9.56F);
fb.put(7.61F);
fb.put(4.61F);
// revind the float buffer
fb.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb: "
+ Arrays.toString(fb.array()));
// creating object of floatbuffer fb1
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity1);
// putting the value in fb1
fb1.put(9.56F);
fb1.put(7.61F);
fb1.put(4.61F);
// revind the float buffer
fb1.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb1: "
+ Arrays.toString(fb1.array()));
// compare both buffer and store the value into integer
int i = fb.compareTo(fb1);
// if else condition
if (i == 0)
System.out.println("\nboth buffer are lexicographically equal");
else if (i >= 0)
System.out.println("\nfb is lexicographically greater than fb1");
else
System.out.println("\nfb is lexicographically less than fb1");
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出：
FloatBuffer fb: [9.56, 7.61, 4.61]
FloatBuffer fb1: [9.56, 7.61, 4.61]
both buffer are lexicographically equal
示例 2：当此 FloatBuffer 大于传递的 FloatBuffer 时
// Java program to demonstrate
// compareTo() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the fb
int capacity1 = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer fb
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity1);
// putting the value in fb
fb.put(9.56F);
fb.put(7.61F);
fb.put(4.61F);
// revind the float buffer
fb.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb: "
+ Arrays.toString(fb.array()));
// creating object of floatbuffer fb1
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity1);
// putting the value in fb1
fb1.put(8.56F);
fb1.put(7.61F);
fb1.put(4.61F);
// revind the float buffer
fb1.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb1: "
+ Arrays.toString(fb1.array()));
// compare both buffer and store the value into integer
int i = fb.compareTo(fb1);
// if else condition
if (i == 0)
System.out.println("\nboth buffer are lexicographically equal");
else if (i >= 0)
System.out.println("\nfb is lexicographically greater than fb1");
else
System.out.println("\nfb is lexicographically less than fb1");
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出：
FloatBuffer fb: [9.56, 7.61, 4.61]
FloatBuffer fb1: [8.56, 7.61, 4.61]
fb is lexicographically greater than fb1
示例 3：当此 FloatBuffer 小于传递的 FloatBuffer
// Java program to demonstrate
// compareTo() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the fb
int capacity1 = 3;
// Creating the FloatBuffer
try {
// creating object of floatbuffer fb
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity1);
// putting the value in fb
fb.put(8.56F);
fb.put(7.61F);
fb.put(4.61F);
// revind the float buffer
fb.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb: "
+ Arrays.toString(fb.array()));
// creating object of floatbuffer fb1
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity1);
// putting the value in fb1
fb1.put(9.56F);
fb1.put(7.61F);
fb1.put(4.61F);
// revind the float buffer
fb1.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb1: "
+ Arrays.toString(fb1.array()));
// compare both buffer and store the value into integer
int i = fb.compareTo(fb1);
// if else condition
if (i == 0)
System.out.println("\nboth buffer are lexicographically equal");
else if (i >= 0)
System.out.println("\nfb is lexicographically greater than fb1");
else
System.out.println("\nfb is lexicographically less than fb1");
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws : " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws : " + e);
}
}
}
输出：
FloatBuffer fb: [8.56, 7.61, 4.61]
FloatBuffer fb1: [9.56, 7.61, 4.61]
fb is lexicographically less than fb1