java的equals方法

Clock Class equals()方法 (Clock 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 Clock object and the given Object are equal or not.

  equals()方法用于检查此Clock对象与给定的Object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 in terms of state otherwise it returns false.

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

Example:

例：

// Java program to demonstrate the example // of boolean equals(Object o) method of Clockimport java.time.*;public class EqualsOfClock {
       public static void main(String args[]) {
           // Initialize two Clock objects          Clock cl1 = Clock.systemDefaultZone();        Clock cl2 = Clock.systemUTC();        // Display cl1 instant        Instant cl_ins = cl1.instant();        System.out.println("cl1.instant(): " + cl_ins);        // Display cl2 instant        cl_ins = cl2.instant();        System.out.println("cl2.instant(): " + cl_ins);        // checks whether this object(cl1) is equal to        // the given object(cl2) or not here it returns        // false because their instant are not same        boolean status = cl1.equals(cl2);        System.out.println("cl1.equals (cl2): " + status);        // checks whether this object(cl1) is equal to        // the given object(null) or not here it returns        // false when we compare this object        // with null         status = cl1.equals(null);        System.out.println("cl1.equals (null): " + status);    }}

Output

输出量

cl1.instant(): 2020-05-13T17:21:57.819316Zcl2.instant(): 2020-05-13T17:21:57.891364Zcl1.equals (cl2): falsecl1.equals (null): false

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java的equals方法