极客教程Java ShortBuffer compareTo方法及示例
java.nio.ShortBuffer 类的 compareTo() 方法是用来比较一个缓冲区和另一个缓冲区。两个短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。一对短元素的比较是通过调用Short.compare(short, short)来实现的。短缓冲区不能与任何其他类型的对象相比较。
语法:
public int compareTo(ShortBuffer that)
参数 ：该方法接收一个 shortbuffer 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：
程序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 sb
int capacity1 = 3;
// Creating the ShortBuffer
try {
// creating object of shortbuffer sb
// and allocating size capacity
ShortBuffer sb = ShortBuffer.allocate(capacity1);
// putting the value in sb
sb.put((short)956);
sb.put((short)761);
sb.put((short)461);
// rewind the short buffer
sb.rewind();
// print the ShortBuffer
System.out.println(" ShortBuffer sb: "
+ Arrays.toString(sb.array()));
// creating object of shortbuffer sb1
// and allocating size capacity
ShortBuffer sb1 = ShortBuffer.allocate(capacity1);
// putting the value in sb1
sb1.put((short)956);
sb1.put((short)761);
sb1.put((short)461);
// rewind the short buffer
sb1.rewind();
// print the shortBuffer
System.out.println(" ShortBuffer sb1: "
+ Arrays.toString(sb1.array()));
// compare both buffer and store the value into integer
int i = sb.compareTo(sb1);
// 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
ShortBuffer sb: [956, 761, 461]
ShortBuffer sb1: [956, 761, 461]
both buffer are lexicographically equal
程序2 ：当这个ShortBuffer大于传递的ShortBuffer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 sb
int capacity1 = 3;
// Creating the ShortBuffer
try {
// creating object of shortbuffer sb
// and allocating size capacity
ShortBuffer sb = ShortBuffer.allocate(capacity1);
// putting the value in sb
sb.put((short)956);
sb.put((short)761);
sb.put((short)41);
// rewind the short buffer
sb.rewind();
// print the ShortBuffer
System.out.println(" ShortBuffer s: "
+ Arrays.toString(sb.array()));
// creating object of shortbuffer sb1
// and allocating size capacity
ShortBuffer sb1 = ShortBuffer.allocate(capacity1);
// putting the value in sb1
sb1.put((short)856);
sb1.put((short)761);
sb1.put((short)461);
// rewind the short buffer
sb1.rewind();
// print the ShortBuffer
System.out.println(" ShortBuffer sb1: "
+ Arrays.toString(sb1.array()));
// compare both buffer and store the value into integer
int i = sb.compareTo(sb1);
// 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
ShortBuffer s: [956, 761, 41]
ShortBuffer sb1: [856, 761, 461]
fb is lexicographically greater than fb1
程序3 ：当这个ShortBuffer小于传递的ShortBuffer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 sb
int capacity1 = 3;
// Creating the ShortBuffer
try {
// creating object of shortbuffer sb
// and allocating size capacity
ShortBuffer sb = ShortBuffer.allocate(capacity1);
// putting the value in sb
sb.put((short)856);
sb.put((short)761);
sb.put((short)461);
// rewind the short buffer
sb.rewind();
// print the ShortBuffer
System.out.println(" ShortBuffer sb: "
+ Arrays.toString(sb.array()));
// creating object of shortbuffer sb1
// and allocating size capacity
ShortBuffer sb1 = ShortBuffer.allocate(capacity1);
// putting the value in sb1
sb1.put((short)956);
sb1.put((short)761);
sb1.put((short)461);
// rewind the short buffer
sb1.rewind();
// print the ShortBuffer
System.out.println(" ShortBuffer sb1: "
+ Arrays.toString(sb1.array()));
// compare both buffer and store the value into integer
int i = sb.compareTo(sb1);
// 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
ShortBuffer sb: [856, 761, 461]
ShortBuffer sb1: [956, 761, 461]
fb is lexicographically less than fb1