Java Date equals()用法及代码示例

Java Date类的equals()方法基于毫秒差检查两个Date是否相等。

用法:

public boolean equals(Object obj)

参数：该函数接受单个参数obj，该参数指定要与之进行比较的对象。

返回值：该函数提供以下2个返回值：

如果对象相等，则为true。
如果对象不相等，则返回false。

异常：该函数不会引发任何异常。

下面的程序演示了上述函数：

// Java code to demonstrate 
// equals() function of Date class 
  
import java.util.Date; 
import java.util.Calendar; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
  
        // creating a Calendar object 
        Calendar c = Calendar.getInstance(); 
  
        // set Month 
        // MONTH starts with 0 i.e. ( 0 - Jan) 
        c.set(Calendar.MONTH, 11); 
  
        // set Date 
        c.set(Calendar.DATE, 05); 
  
        // set Year 
        c.set(Calendar.YEAR, 1996); 
  
        // creating a date object with specified time. 
        Date dateOne = c.getTime(); 
  
        System.out.println("Date 1: " + dateOne); 
  
        // creating a date of object 
        // storing the current date 
        Date currentDate = new Date(); 
  
        System.out.println("Date 2: " + currentDate); 
  
        System.out.println("Are both dates equal: "
                           + currentDate.equals(dateOne)); 
    } 
}

输出：

Date 1: Thu Dec 05 08:19:56 UTC 1996
Date 2: Wed Jan 02 08:19:56 UTC 2019
Are both dates equal: false

// Java code to demonstrate 
// equals() function of Date class 
  
import java.util.Date; 
import java.util.Calendar; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
  
        // creating a Calendar object 
        Calendar c1 = Calendar.getInstance(); 
  
        // set Month 
        // MONTH starts with 0 i.e. ( 0 - Jan) 
        c1.set(Calendar.MONTH, 11); 
  
        // set Date 
        c1.set(Calendar.DATE, 05); 
  
        // set Year 
        c1.set(Calendar.YEAR, 1996); 
  
        // creating a date object with specified time. 
        Date dateOne = c1.getTime(); 
  
        System.out.println("Date 1: " + dateOne); 
  
        // creating a Calendar object 
        Calendar c2 = Calendar.getInstance(); 
  
        // set Month 
        // MONTH starts with 0 i.e. ( 0 - Jan) 
        c2.set(Calendar.MONTH, 11); 
  
        // set Date 
        c2.set(Calendar.DATE, 05); 
  
        // set Year 
        c2.set(Calendar.YEAR, 1995); 
  
        // creating a date object with specified time. 
        Date dateTwo = c2.getTime(); 
  
        System.out.println("Date 1: " + dateTwo); 
  
        System.out.println("Are both dates equal: "
                           + dateTwo.equals(dateOne)); 
    } 
}

输出：

Date 1: Thu Dec 05 08:20:05 UTC 1996
Date 1: Tue Dec 05 08:20:05 UTC 1995
Are both dates equal: false

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注：本文由纯净天空筛选整理自Twinkl Bajaj大神的英文原创作品 Date 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。