java的equals方法

LocalDateTime類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()方法用于檢查此日期時間和給定對象是否相等。

• 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()方法是一種非靜態方法，僅可通過類對象訪問，如果嘗試使用類名訪問該方法，則會收到錯誤消息。

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

  在比較兩個對象時， equals()方法不會引發異常。

Syntax:

句法：

    public boolean equals(Object o);

Parameter(s):

參數：

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

  對象o –表示要與該對象進行比較的對象。

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.

此方法的返回類型為boolean ，當兩個比較對象相等時返回true，否則返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean equals(Object o) method 
// of LocalDateTime
import 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

輸出量

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

翻譯自: https://www.includehelp.com/java/localdatetime-equals-method-with-example.aspx

java的equals方法