哈希表类equals()方法 (Hashtable Class equals() method)

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

  equals()方法在java.util包中可用。

• equals() method is used to check whether equality of this Hashtable with the given Object or not.

  equals()方法用于检查此Hashtable与给定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 checking the equality of two objects.

  在检查两个对象的相等性时， equals()方法不会引发异常。

Syntax:

句法：

    public boolean equals(Object ob);

Parameter(s):

参数：

• Object ob – represents the object to be checked for equality.

  对象ob –表示要检查其是否相等的对象。

Return value:

返回值：

The return type of the method is boolean,

方法的返回类型为boolean 。

• It returns true when this Hashtable is the same as the given object.

  当此Hashtable与给定对象相同时，它返回true 。

• It returns false when this Hashtable is not the same as the given object.

  当此哈希表与给定对象不同时，它返回false 。

Example:

例：

// Java program to demonstrate the example
// of boolean equals(Object ob) method of Hashtable
import java.util.*;
public class EqualsOfHashtable {public static void main(String[] args) {// Instantiate two hashtable object
Hashtable ht = new Hashtable();
Hashtable comp_ht = new Hashtable();
// By using put() method is to
// add the linked values in an Hashtable ht
ht.put(10, "C");
ht.put(20, "C++");
ht.put(30, "JAVA");
ht.put(40, "PHP");
ht.put(50, "SFDC");
// By using put() method is to
// add the linked values in an
// Hashtable comp_ht
comp_ht.put(60, "COBOL");
comp_ht.put(70, "HTML");
// Display Hashtable
System.out.println("Hashtable: " + ht);
// By using equals() method isto
// check equality of two hashtable objects
boolean status = ht.equals(comp_ht);
// Display Status of Hashtable
System.out.println("ht.equals(comp_ht): " + status);
}
}

Output

输出量

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.equals(comp_ht): false

翻译自: https://www.includehelp.com/java/hashtable-equals-method-with-example.aspx