java.text.RuleBasedCollat??or類的compare()方法用于比較兩個對象的強度，并且根據結果將返回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：如果第一個對象等于，小于或小于另一個對象，則它將分別返回零，正值和負值。

異常：如果參數之一為null，則此方法引發NullPointerException。

下面是說明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

// 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() 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 (ParseException e) {

System.out.println(e);

}

catch (NullPointerException e) {

System.out.println(e);

}

}

}

輸出：

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 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() 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 (ParseException e) {

System.out.println(e);

}

catch (NullPointerException e) {

System.out.println("one of the object is null");

System.out.println(e);

}

}

}

輸出：

one of the object is null

java.lang.NullPointerException

總結

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