Java Collator compare(Object, Object)用法及代码示例

java.text.Collator类的compare()方法用于比较两个对象的强度，并根据结果返回0，正值和负值作为输出。

用法:

public int compare(Object o1, Object o2)

参数：此方法需要两个对象之间进行比较。

返回值：如果第一个对象等于，小于或小于另一个对象，则它将分别返回零，正值和负值。

异常：如果参数不能转换为字符串，则此方法将引发ClassCastException。

下面是说明compare()方法的示例：

范例1：

// Java program to demonstrate 
// compare() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing Collator Object 
            Collator col = Collator.getInstance(); 
  
            // Creating an initializing 
            // object for comparison 
            Object obj1 = "ab"; 
  
            // Creating an initializing 
            // Object for comparison 
            Object obj2 = "Ab"; 
  
            // compare both object 
            // using compare() mehtod 
            int i 
                = col.compare((String)obj1, (String)obj2); 
  
            // display result 
            if (i < 0) 
                System.out.println("ab is less than Ab"); 
            else if (i > 0) 
                System.out.println("ab is greater than Ab"); 
            else
                System.out.println("ab is equal to Ab"); 
        } 
  
        catch (ClassCastException e) { 
  
            System.out.println("Exception thrown:" + e); 
        } 
    } 
}

输出：

ab is less than Ab

范例2：

// Java program to demonstrate 
// compare() method 
  
import java.text.*; 
import java.util.*; 
import java.io.*; 
  
public class GFG { 
    public static void main(String[] argv) 
    { 
        try { 
  
            // Creating and initializing Collator Object 
            Collator col = Collator.getInstance(); 
  
            // Creating an initializing object for comparison 
            Object obj1 = "ab"; 
  
            // Creating an initializing Object for comparison 
            Object obj2 = 1234; 
  
            // compare both object 
            // using compare() mehtod 
            int i = col.compare((String)obj1, (String)obj2); 
  
            // display result 
            if (i < 0) 
                System.out.println("ab is less than Ab"); 
            else if (i > 0) 
                System.out.println("ab is greater than Ab"); 
            else
                System.out.println("ab is equal to Ab"); 
        } 
  
        catch (ClassCastException e) { 
  
            System.out.println("Exception thrown:" + e); 
        } 
    } 
}

输出：

Exception thrown:
 java.lang.ClassCastException:
 java.lang.Integer cannot be cast to java.lang.String

参考： https://docs.oracle.com/javase/9/docs/api/java/text/Collator.html#compare-java.lang.Object-java.lang.Object-

相关用法

注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Collator compare(Object, Object) method in Java with Example。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。