Java 中的规则库比较()方法与示例
原文:https://www . geesforgeks . org/rulesbasedcollator-compare-method-in-Java-with-example/
Java . text . rulesbasedcollator类的 compare() 方法用于比较两个对象的强度，它会根据结果返回 0，正值和负值作为输出。
语法:
public int compare(Object o1, Object o2)
参数:该方法取两个对象，两者之间进行比较。 返回值:如果第一个对象等于、大于或小于另一个对象，那么它将分别返回零、正值和负值。 异常:如果其中一个参数为空，该方法抛出 NullPointerException 。
以下是说明比较()方法的示例:
例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// 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
// RuleBasedCollator Object
RuleBasedCollator col
= new RuleBasedCollator("< a< b< c< d");
// Creating an initializing
// object for comparison
Object obj1 = "ab";
// Creating an initializing
// Object for comparison
Object obj2 = "Ab";
// compare both object
// using compare() method
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 (ParseException e) {
System.out.println(e);
}
catch (NullPointerException e) {
System.out.println(e);
}
}
}
Output:
ab is less than Ab
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// 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 RuleBasedCollator Object
RuleBasedCollator col
= new RuleBasedCollator("< a< b< c< d");
// Creating an initializing
// object for comparison
Object obj1 = null;
// Creating an initializing
// Object for comparison
Object obj2 = "Ab";
// compare both object
// using compare() method
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 (ParseException e) {
System.out.println(e);
}
catch (NullPointerException e) {
System.out.println("one of the object is null");
System.out.println(e);
}
}
}
Output:
one of the object is null
java.lang.NullPointerException
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