java的equals方法

LocalDateTime类equals()方法 (LocalDateTime Class equals() method)

• equals() method is available in java.time package.

  equals()方法在java.time包中可用。

• equals() method is used to check whether this date-time and the given object are equal or not.

  equals()方法用于检查此日期时间和给定对象是否相等。

• equals() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  equals()方法是一种非静态方法，仅可通过类对象访问，如果尝试使用类名访问该方法，则会收到错误消息。

• equals() method does not throw an exception at the time of comparing two objects.

  在比较两个对象时， equals()方法不会引发异常。

Syntax:

句法：

public boolean equals(Object o);

Parameter(s):

参数：

• Object o – represents the object is to be compared to this object.

  对象o –表示要与该对象进行比较的对象。

Return value:

返回值：

The return type of this method is boolean, it returns true when both the compared objects are equal otherwise it returns false.

此方法的返回类型为boolean ，当两个比较对象相等时返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example // of boolean equals(Object o) method // of LocalDateTimeimport java.time.*;public class EqualsOfLocalDateTime {
       public static void main(String args[]) {
           // Instantiates two LocalDateTime        LocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");        LocalDateTime da_ti2 = LocalDateTime.now();        // Display da_ti1, da_ti2        System.out.println("LocalDateTime da_ti1 and da_ti2: ");        System.out.println("da_ti1: " + da_ti1);        System.out.println("da_ti2: " + da_ti2);        System.out.println();        // Here, this method compare this date-time        // to the given object for equality        // i.e. it returns false because both        // objects date and time are not same        boolean status = da_ti1.equals(da_ti2);        // Display status        System.out.println("da_ti1.equals(da_ti2): " + status);        // Here, this method compares this date-time        // to the given object for equality        // i.e. it returns true because both         // objects date and time are same        status = da_ti1.equals(da_ti1);        // Display status        System.out.println("da_ti1.equals(da_ti1): " + status);    }}

Output

输出量

LocalDateTime da_ti1 and da_ti2: da_ti1: 2005-10-05T10:10:10da_ti2: 2020-06-04T08:41:24.891685da_ti1.equals(da_ti2): falseda_ti1.equals(da_ti1): true

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java的equals方法