Java中的 Collator equals(Object) 方法与示例

Java.text.Collator 类的equals()方法用于检查两个 Collator 对象是否相同。

句法：

public boolean equals(Object that)

参数：此方法采用两个将要进行比较的Collator 对象。
返回值：如果两个 Collator 对象彼此相等，则返回 true，否则返回 false。
以下是说明equals()方法的示例：
示例 1：

Java

// Java program to demonstrate
// equals() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // Creating and initializing new simple rule
            String simple = "< a< b< c< d";
 
            // Creating and initializing
            // new RuleBasedCollator Object
            RuleBasedCollator col_1
                = new RuleBasedCollator(simple);
 
            // Creating and initializing
            // Collator Object
            Collator col_2
                = Collator.getInstance(Locale.US);
 
            // compare both object
            // using equals() method
            boolean i = col_1.equals(col_2);
 
            // display result
            if (i)
                System.out.println(col_1
                                   + " is equal to "
                                   + col_2);
            else
                System.out.println(col_1
                                   + " is not equal to "
                                   + col_2);
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ParseException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

java.text.RuleBasedCollator@5eb2e1c2 is not equal to java.text.RuleBasedCollator@289747d6

示例 2：

Java

// Java program to demonstrate
// equals() 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_1
                = Collator.getInstance(Locale.UK);
 
            // Creating and initializing
            // Collator Object
            Collator col_2
                = Collator.getInstance(Locale.US);
 
            // compare both object
            // using equals() method
            boolean i = col_1.equals(col_2);
 
            // display result
            if (i)
                System.out.println(col_1
                                   + " is equal to "
                                   + col_2);
            else
                System.out.println(col_1
                                   + " is not equal to "
                                   + col_2);
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

java.text.RuleBasedCollator@289747d6 is equal to java.text.RuleBasedCollator@289747d6

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