Java FloatBuffer compareTo()方法及示例

java.nio.FloatBuffer 类的 compareTo() 方法是用来比较一个缓冲区和另一个缓冲区。两个Float缓冲区通过比较它们的剩余元素序列进行比较，不考虑每个序列在其相应缓冲区中的起始位置。一对Float元素的比较是通过调用Float.compare(float, float)进行的，只是-0.0和0.0被认为是相等的。Float.NaN被该方法认为是等于自己，并且大于所有其他的浮点数（包括Float.POSITIVE_INFINITY）。Float缓冲区不能与任何其他类型的对象相提并论。语法 :

public int compareTo(FloatBuffer that)

参数： 该方法接受一个 floatbuffer对象 作为参数，该缓冲区将与之进行比较。
返回值： 该方法在该缓冲区小于、等于或大于给定的缓冲区时返回一个 负整数、零或正整数 。下面是说明compareTo()方法的例子：

例子1： 当两个FloatBuffer都相等时。

// 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);             // rewind 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);             // rewind 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

例2： 当这个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);             // rewind 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);             // rewind 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

例3： 当这个FloatBuffer小于传递的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(8.56F);            fb.put(7.61F);            fb.put(4.61F);             // rewind 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);             // rewind 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