Java IntBuffer compareTo()方法

java.nio.IntBuffer 类的 compareTo() 方法是用来比较一个缓冲区和另一个缓冲区。两个int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int元素的比较是通过调用Int.compare(int, int)进行的，除了-0和0被认为是相等的。本方法认为Int.NaN等于自己，并且大于所有其他的int值（包括Int.POSITIVE_INFINITY）。一个int缓冲区不能与任何其他类型的对象相提并论。

语法:

public int compareTo(IntBuffer that)

参数 ：该方法接受一个 intbuffer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 。下面的程序说明了 compareTo() 方法：

例子1： 当两个IntBuffer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 ib        int capacity1 = 3;         // Creating the IntBuffer        try {             // creating object of Intbuffer ib            // and allocating size capacity            IntBuffer ib = IntBuffer.allocate(capacity1);             // putting the value in ib            ib.put(9);            ib.put(7);            ib.put(4);             // rewind the Int buffer            ib.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib: "                               + Arrays.toString(ib.array()));             // creating object of Intbuffer ib1            // and allocating size capacity            IntBuffer ib1 = IntBuffer.allocate(capacity1);             // putting the value in ib1            ib1.put(9);            ib1.put(7);            ib1.put(4);             // rewind the Int buffer            ib1.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib1: "                               + Arrays.toString(ib1.array()));             // compare both buffer and store the value into integer            int i = ib.compareTo(ib1);             // if else condition            if (i == 0)                System.out.println("\nBoth buffer are lexicographically equal");            else if (i >= 0)                System.out.println("\nib is lexicographically greater than ib1");            else                System.out.println("\nib is lexicographically less than ib1");        }         catch (IllegalArgumentException e) {            System.out.println("Exception throws : " + e);        }         catch (ReadOnlyBufferException e) {            System.out.println("Exception throws : " + e);        }    }}

输出

IntBuffer ib: [9, 7, 4]IntBuffer ib1: [9, 7, 4]Both buffer are lexicographically equal

例2： 当这个IntBuffer大于传递的IntBuffer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 ib        int capacity1 = 3;         // Creating the IntBuffer        try {             // creating object of Intbuffer ib            // and allocating size capacity            IntBuffer ib = IntBuffer.allocate(capacity1);             // putting the value in ib            ib.put(9);            ib.put(7);            ib.put(4);             // rewind the Int buffer            ib.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib: "                               + Arrays.toString(ib.array()));             // creating object of Intbuffer ib1            // and allocating size capacity            IntBuffer ib1 = IntBuffer.allocate(capacity1);             // putting the value in ib1            ib1.put(8);            ib1.put(7);            ib1.put(4);             // rewind the Int buffer            ib1.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib1: "                               + Arrays.toString(ib1.array()));             // compare both buffer and store the value into integer            int i = ib.compareTo(ib1);             // if else condition            if (i == 0)                System.out.println("\nBoth buffer are lexicographically equal");            else if (i >= 0)                System.out.println("\nib is lexicographically greater than ib1");            else                System.out.println("\nib is lexicographically less than ib1");        }         catch (IllegalArgumentException e) {            System.out.println("Exception throws : " + e);        }         catch (ReadOnlyBufferException e) {            System.out.println("Exception throws : " + e);        }    }}

输出

IntBuffer ib: [9, 7, 4]IntBuffer ib1: [8, 7, 4]ib is lexicographically greater than ib1

例3： 当这个IntBuffer小于传递的IntBuffer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 ib        int capacity1 = 3;         // Creating the IntBuffer        try {             // creating object of Intbuffer ib            // and allocating size capacity            IntBuffer ib = IntBuffer.allocate(capacity1);             // putting the value in ib            ib.put(8);            ib.put(7);            ib.put(4);             // rewind the Int buffer            ib.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib: "                               + Arrays.toString(ib.array()));             // creating object of Intbuffer ib1            // and allocating size capacity            IntBuffer ib1 = IntBuffer.allocate(capacity1);             // putting the value in ib1            ib1.put(9);            ib1.put(7);            ib1.put(4);             // rewind the Int buffer            ib1.rewind();             // print the IntBuffer            System.out.println("IntBuffer ib1: "                               + Arrays.toString(ib1.array()));             // compare both buffer and store the value into integer            int i = ib.compareTo(ib1);             // if else condition            if (i == 0)                System.out.println("\nBoth buffer are lexicographically equal");            else if (i >= 0)                System.out.println("\nib is lexicographically greater than ib1");            else                System.out.println("\nib is lexicographically less than ib1");        }         catch (IllegalArgumentException e) {            System.out.println("Exception throws : " + e);        }         catch (ReadOnlyBufferException e) {            System.out.println("Exception throws : " + e);        }    }}

输出

IntBuffer ib: [8, 7, 4]IntBuffer ib1: [9, 7, 4]ib is lexicographically less than ib1