Java CharBuffer compareTo()用法及代码示例

java.nio.charBuffer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剩余字符的序列比较两个char缓冲区，而无需考虑每个序列在其相应缓冲区中的开始位置。通过调用Char.compare(char，char)比较成对的char元素。任何其他类型的对象都无法与char缓冲区进行比较。

用法:

public int compareTo(CharBuffer that)

参数：此方法将charbuffer对象作为参数，将与该缓冲区进行比较。

返回值：由于此缓冲区小于，等于或大于给定的缓冲区，因此此方法返回负整数，零或正整数。

下面是说明compareTo()方法的示例：

示例1:当两个CharBuffer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 cb 
        int capacity1 = 3; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of charbuffer cb 
            // and allocating size capacity 
            CharBuffer cb = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb 
            cb.put('a'); 
            cb.put('b'); 
            cb.put('c'); 
  
            // revind the float buffer 
            cb.rewind(); 
  
            // print the Charbuffer 
            System.out.println("Charbuffer cb: "
                               + Arrays.toString(cb.array())); 
  
            // creating object of floatbuffer cb1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb1 
            cb1.put('a'); 
            cb1.put('b'); 
            cb1.put('c'); 
  
            // revind the float buffer 
            cb1.rewind(); 
  
            // print the Charbuffer 
            System.out.println("Charbuffer cb1: "
                               + Arrays.toString(cb1.array())); 
  
            // compare both buffer and store the value into integer 
            int i = cb.compareTo(cb1); 
  
            // if else condition 
            if (i == 0) 
                System.out.println("\nboth buffer are"
                                   + "lexicographically equal"); 
  
            else if (i >= 0) 
                System.out.println("\ncb is lexicographically"
                                   + "greater than cb1"); 
  
            else
                System.out.println("\ncb is lexicographically"
                                   + "less than cb1"); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("Exception throws : " + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
            System.out.println("Exception throws : " + e); 
        } 
    } 
}

输出：

Charbuffer cb: [a, b, c]
Charbuffer cb1: [a, b, c]

both buffer arelexicographically 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 cb 
        int capacity1 = 3; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of floatbuffer cb 
            // and allocating size capacity 
            CharBuffer cb = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb 
            cb.put('g'); 
            cb.put('b'); 
            cb.put('c'); 
  
            // revind the float buffer 
            cb.rewind(); 
  
            // print the CharBuffer 
            System.out.println("CharBuffer cb: "
                               + Arrays.toString(cb.array())); 
  
            // creating object of floatbuffer cb1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb1 
            cb1.put('a'); 
            cb1.put('b'); 
            cb1.put('c'); 
  
            // revind the float buffer 
            cb1.rewind(); 
  
            // print the CharBuffer 
            System.out.println("CharBuffer cb1: "
                               + Arrays.toString(cb1.array())); 
  
            // compare both buffer and store 
            // the value into integer 
            int i = cb.compareTo(cb1); 
  
            // if else condition 
            if (i == 0) 
                System.out.println("\nboth buffer are"
                                   + " lexicographically equal"); 
  
            else if (i >= 0) 
                System.out.println("\ncb is lexicographically"
                                   + " greater than cb1"); 
  
            else
                System.out.println("\ncb is lexicographically"
                                   + " less than cb1"); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("Exception throws : " + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
            System.out.println("Exception throws : " + e); 
        } 
    } 
}

输出：

CharBuffer cb: [g, b, c]
CharBuffer cb1: [a, b, c]

cb is lexicographically greater than cb1

示例3:当此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 cb 
        int capacity1 = 3; 
  
        // Creating the CharBuffer 
        try { 
  
            // creating object of CharBuffer cb 
            // and allocating size capacity 
            CharBuffer cb = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb 
            cb.put('a'); 
            cb.put('b'); 
            cb.put('c'); 
  
            // revind the float buffer 
            cb.rewind(); 
  
            // print the CharBuffer 
            System.out.println("CharBuffer cb: "
                               + Arrays.toString(cb.array())); 
  
            // creating object of CharBuffer cb1 
            // and allocating size capacity 
            CharBuffer cb1 = CharBuffer.allocate(capacity1); 
  
            // putting the value in cb1 
            cb1.put('g'); 
            cb1.put('b'); 
            cb1.put('c'); 
  
            // revind the float buffer 
            cb1.rewind(); 
  
            // print the CharBuffer 
            System.out.println("CharBuffer cb1: "
                               + Arrays.toString(cb1.array())); 
  
            // compare both buffer and store the value into integer 
            int i = cb.compareTo(cb1); 
  
            // if else condition 
            if (i == 0) 
                System.out.println("\nboth buffer are"
                                   + "lexicographically equal"); 
            else if (i >= 0) 
                System.out.println("\ncb is lexicographically"
                                   + "greater than cb1"); 
            else
                System.out.println("\ncb is lexicographically"
                                   + "less than cb1"); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("Exception throws : " + e); 
        } 
  
        catch (ReadOnlyBufferException e) { 
            System.out.println("Exception throws : " + e); 
        } 
    } 
}

输出：

CharBuffer cb: [a, b, c]
CharBuffer cb1: [g, b, c]

cb is lexicographicallyless than cb1

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CharBuffer compareTo() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。