java.text.Collat​​or类的compare()方法用于比较两个字符串的强度，并根据结果返回0，正值和负值作为输出。

用法:

public abstract int compare(String source,

String target)

参数：此方法需要两个字符串之间进行比较。

返回值：如果第一个字符串等于，大于或小于另一个字符串，则它将分别返回零，正值和负值。

下面是说明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);

}

}

}

输出：

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);

}

}

}

输出：

ab is less than cd