Java Collator compare(Object, Object)用法及代碼示例

java.text.Collator類的compare()方法用於比較兩個對象的強度，並根據結果返回0，正值和負值作為輸出。

用法:

public int compare(Object o1, Object o2)

參數：此方法需要兩個對象之間進行比較。

返回值：如果第一個對象等於，小於或小於另一個對象，則它將分別返回零，正值和負值。

異常：如果參數不能轉換為字符串，則此方法將引發ClassCastException。

下麵是說明compare()方法的示例：

範例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); 
        } 
    } 
}

輸出：

ab is less than Ab

範例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); 
        } 
    } 
}

輸出：

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

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

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Collator compare(Object, Object) method in Java with Example。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。