Java SimpleDateFormat equals()方法及示例

SimpleDateFormat类 的 equals() 方法是用来比较两个SimpleDateFormat对象。如果这个SimpleDateFormat等于所传递的对象，该方法返回True，否则返回False。

语法

public boolean equals(Object obj)

参数： 该方法需要一个对象类型的参数 obj ，指的是要与这个SimpleDateFormat对象进行比较的对象。

返回值： 如果两个对象都相等，该方法返回布尔值True，否则该方法返回False。

下面的程序说明了SimpleDateFormat的equals()方法的工作原理：
示例1 :

// Java code to illustrate equals() method  import java.text.*;import java.util.*;  public class SimpleDateFormat_Demo {    public static void main(String[] args)        throws InterruptedException, ParseException    {        // Initializing the first formatter        SimpleDateFormat SDFormat1            = new SimpleDateFormat();          // Initializing the second formatter        SimpleDateFormat SDFormat2            = new SimpleDateFormat();          // Displaying both the Formats        Date date = new Date();        String str_Date1            = SDFormat1.format(date);        System.out.println("First: "                           + (str_Date1));          String str_Date2            = SDFormat2.format(date);        System.out.println("Second: "                           + (str_Date2));          // Comparing both the objects        System.out.println("Equality: "                           + SDFormat1.equals(SDFormat2));    }}

输出:

First: 1/30/19 9:59 AMSecond: 1/30/19 9:59 AMEquality: true

例2 :

// Java code to illustrate equals() method  import java.text.*;import java.util.*;  public class SimpleDateFormat_Demo {    public static void main(String[] args)        throws InterruptedException, ParseException    {        // Initializing the first formatter        SimpleDateFormat SDFormat1            = new SimpleDateFormat();          // Defining the SDFormat        SDFormat1.applyPattern("MMM");          // Initializing the second formatter        SimpleDateFormat SDFormat2            = new SimpleDateFormat();          // Displaying both the Formats        Date date = new Date();        String str_Date1            = SDFormat1.format(date);        System.out.println("First:                            + (str_Date1));          String str_Date2            = SDFormat2.format(date);        System.out.println("Second: "                           + (str_Date2));          // Comparing both the objects        System.out.println("Equality: "                           + SDFormat1.equals(SDFormat2));    }}

输出:

First: JanSecond: 1/30/19 10:00 AMEquality: false