Java中的 MessageFormat equals() 方法与示例

Java.text.MessageFormat类的equals()方法用于检查两个MessageFormat 对象是否相同。

句法：

public boolean equals(Object obj)

参数：此方法采用MessageFormat对象，该对象将与当前的 MessageFormat 对象进行比较。
返回值：如果两个MessageFormat 对象彼此相等，则返回 true，否则返回 false。
以下是说明equals()方法的示例：
示例 1：

Java

// Java program to demonstrate
// equals() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // creating and initializing  MessageFormat
            MessageFormat mf1
                = new MessageFormat("{0, date, #}, {1, time, #}, {0, number}");
 
            // creating and initializing  MessageFormat
            MessageFormat mf2
                = new MessageFormat("{0, date, #}, {1, time, #}, {0, number}");
 
            // compare both object
            // using equals() method
            boolean i = mf1.equals(mf2);
 
            // display result
            if (i)
                System.out.println(
                    "mf1 is equals to mf2");
            else
                System.out.println(
                    "mf1 is not equal to mf2");
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

mf1 is equals to mf2

示例 2：

Java

// Java program to demonstrate
// equals() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // creating and initializing  MessageFormat
            MessageFormat mf1
                = new MessageFormat("{0, date, #}, {1, time, #}, {0, number}");
 
            // creating and initializing  MessageFormat
            MessageFormat mf2
                = new MessageFormat("{0, date, #}, {0, time, #}, {0, number}");
 
            // compare both object
            // using equals() method
            boolean i = mf1.equals(mf2);
 
            // display result
            if (i)
                System.out.println(
                    "mf1 is equals to mf2");
            else
                System.out.println(
                    "mf1 is not equal to mf2");
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

mf1 is not equal to mf2

参考： https://docs.oracle.com/javase/9/docs/api/ Java/text/MessageFormat.html#equals-java.lang.Object-