Java 中的 IntBuffer compareTo()方法
原文:https://www . geesforgeks . org/int buffer-compare to-method-in-Java/
java.nio.IntBuffer 类的 compareTo() 方法用于比较一个缓冲区和另一个缓冲区。两个 int 缓冲区通过字典式地比较它们剩余元素的序列来进行比较，而不考虑每个序列在其对应缓冲区内的起始位置。像调用 Int.compare(Int，int)一样比较 int 元素对，不同的是-0 和 0 被认为是相等的。里面的这个方法认为 NaN 等于它自己，并且大于所有其他 int 值(包括 Int。正数 _ 无穷大)。int 缓冲区无法与任何其他类型的对象相比较。
语法:
public int compareTo(IntBuffer that)
参数:该方法以一个 intbuffer 对象作为参数，与该缓冲区进行比较。
返回值:该方法返回一个负整数、零或一个正整数，因为该缓冲区小于、等于或大于给定的缓冲区。
下面的程序说明了 compareTo() 方法:
示例 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);
// revind 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);
// revind 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);
}
}
}
Output:
IntBuffer ib: [9, 7, 4]
IntBuffer ib1: [9, 7, 4]
Both buffer are lexicographically equal
示例 2: 当该输入缓冲区大于传递的输入缓冲区时
// 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);
// revind 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);
// revind 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);
}
}
}
Output:
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);
// revind 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);
// revind 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);
}
}
}
Output:
IntBuffer ib: [8, 7, 4]
IntBuffer ib1: [9, 7, 4]
ib is lexicographically less than ib1
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