java.text.Collat??or類的compare()方法用于比較兩個字符串的強度，并根據結果返回0，正值和負值作為輸出。

用法:

public abstract int compare(String source,

String target)

參數：此方法需要兩個字符串之間進行比較。

返回值：如果第一個字符串等于，大于或小于另一個字符串，則它將分別返回零，正值和負值。

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 Collator Object

Collator col = Collator.getInstance();

// Creating an initializing object for comparison

String obj1 = "ab";

// Creating an initializing Object for comparison

String obj2 = "Ab";

// compare both object

// using compare() mehtod

int i = col.compare(obj1, 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

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 Collator Object

Collator col = Collator.getInstance();

// Creating an initializing object for comparison

String obj1 = "ab";

// Creating an initializing Object for comparison

String obj2 = "cd";

// compare both object

// using compare() mehtod

int i = col.compare(obj1, obj2);

// display result

if (i < 0)

System.out.println("ab is less than cd");

else if (i > 0)

System.out.println("ab is greater than cd");

else

System.out.println("ab is equal to cd");

}

catch (ClassCastException e) {

System.out.println("Exception thrown:" + e);

}

}

}

輸出：

ab is less than cd

總結

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