Java中的 RuleBasedCollator getRules() 方法及示例

Java.text.RuleBasedCollator 类的getRules()方法用于获取在基于规则的整理器对象初始化期间使用的规则。

句法：

public String getRules()

参数：此方法不接受任何参数作为参数。
返回值：此方法返回在基于规则的整理器对象初始化期间使用的规则。

下面是说明getRules()方法的示例：

示例 1：

Java

// Java program to demonstrate
// getRules() 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 < c & a < b";
 
            // Creating and initializing
            // new RuleBasedCollator Object
            RuleBasedCollator col
                = new RuleBasedCollator(simple);
 
            // getting rule of this object
            // using getRules() method
            String rule = col.getRules();
 
            // display result
            System.out.println("rule is :- "
                               + rule);
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : "
                               + e);
        }
        catch (ParseException e) {
 
            System.out.println("Exception thrown : "
                               + e);
        }
    }
}

输出：

rule is :- < a < c & a < b

示例 2：

Java

// Java program to demonstrate
// getRules() 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
                = new RuleBasedCollator(simple);
 
            // getting rule of this object
            // using getRules() method
            String rule = col.getRules();
 
            // display result
            System.out.println("rule is :- "
                               + rule);
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : "
                               + e);
        }
        catch (ParseException e) {
 
            System.out.println("Exception thrown : "
                               + e);
        }
    }
}

输出：

rule is :- < a < b < c < d

参考： https://docs.oracle.com/javase/9/docs/api/ Java/text/RuleBasedCollator.html#getRules–