Java DateFormat equals()用法及代码示例

DateFormat类的equals()方法用于比较两个DateFormat对象。如果此DateFormat等于传递的对象，则该方法返回True，否则返回False。

用法:

public boolean equals(Object obj)

参数：该方法采用Object类型的一个参数obj，表示要与此DateFormat对象进行比较的对象。

返回值：如果两个对象相等，则该方法返回布尔True，否则返回False。

以下示例程序旨在说明DateFormat的equals()方法的用法：
示例1:

// Java code to illustrate equals() method 
  
import java.text.*; 
import java.util.*; 
  
public class DateFormat_Demo { 
    public static void main(String[] args) 
    { 
        // Initializing the first formatter 
        DateFormat DFormat1 
            = DateFormat.getDateInstance(); 
  
        // Initializing the second formatter 
        DateFormat DFormat2 
            = DateFormat.getDateInstance(); 
  
        // Displaying both the Formats 
        Date date = new Date(); 
        String str_Date1 
            = DFormat1.format(date); 
        System.out.println("First: "
                           + (str_Date1)); 
  
        String str_Date2 
            = DFormat2.format(date); 
        System.out.println("Second: "
                           + (str_Date2)); 
  
        // Comparing both the objects 
        System.out.println("Equality: "
                           + DFormat1.equals(DFormat2)); 
    } 
}

输出：

First: Mar 27, 2019
Second: Mar 27, 2019
Equality: true

示例2:

// Java code to illustrate equals() method 
  
import java.text.*; 
import java.util.*; 
  
public class DateFormat_Demo { 
    public static void main(String[] args) 
    { 
        // Initializing the first formatter 
        DateFormat DFormat1 
            = DateFormat.getDateInstance(); 
  
        // Initializing the second formatter 
        DateFormat DFormat2 
            = DateFormat.getTimeInstance(); 
  
        // Displaying both the Formats 
        Date date = new Date(); 
        String str_Date1 
            = DFormat1.format(date); 
        System.out.println("First: "
                           + (str_Date1)); 
  
        String str_Date2 
            = DFormat2.format(date); 
        System.out.println("Second: "
                           + (str_Date2)); 
  
        // Comparing both the objects 
        System.out.println("Equality: "
                           + DFormat1.equals(DFormat2)); 
    } 
}

输出：

First: Mar 27, 2019
Second: 11:04:25 AM
Equality: false

参考： https://docs.oracle.com/javase/7/docs/api/java/text/DateFormat.html#equals(java.lang.Object)

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注：本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 DateFormat equals() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。