Java中的 AbstractMap equals() 方法及示例
Java中的AbstractMap.equals()方法用于检查两个映射之间的相等性。它验证作为参数传递的一个映射的元素是否等于该映射的元素。
句法:
AbstractMap1.equals(AbstractMap2)
参数:该方法接受一个抽象哈希映射类型的参数ihashmap2 ,并引用与该抽象映射进行相等性检查的映射。
返回值:如果相等对两个对象映射都成立,则该方法返回 true,否则返回 false。
下面的程序说明了 AbstractMap.equals() 方法的工作:
方案一:
// Java code to illustrate the equals() method
import java.util.*;
public class Abstract_Map_Demo {
public static void main(String[] args)
{
// Creating an empty AbstractMap
AbstractMap
abstract_hash1 = new IdentityHashMap();
AbstractMap
abstract_hash2 = new IdentityHashMap();
// Mapping string values to int keys
abstract_hash1.put(10, "Geeks");
abstract_hash1.put(15, "4");
abstract_hash1.put(20, "Geeks");
abstract_hash1.put(25, "Welcomes");
abstract_hash1.put(30, "You");
// Mapping string values to int keys
abstract_hash2.put(10, "Geeks");
abstract_hash2.put(15, "4");
abstract_hash2.put(20, "Geeks");
abstract_hash2.put(25, "Welcomes");
abstract_hash2.put(30, "You");
// Displaying the AsbstractMap
System.out.println("First Map: "
+ abstract_hash1);
// Displaying the final AbstractMap
System.out.println("Second Map: "
+ abstract_hash2);
// Displaying the equality
System.out.println("Equality: "
+ abstract_hash1.equals(abstract_hash2));
}
}
输出:
First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Equality: true
方案二:
// Java code to illustrate the equals() method
import java.util.*;
public class Abstract_Map_Demo {
public static void main(String[] args)
{
// Creating an empty AbstractMap
AbstractMap
abstract_hash1 = new IdentityHashMap();
AbstractMap
abstract_hash2 = new IdentityHashMap();
// Mapping string values to int keys
abstract_hash1.put(10, "Geeks");
abstract_hash1.put(15, "4");
abstract_hash1.put(20, "Geeks");
abstract_hash1.put(25, "Welcomes");
abstract_hash1.put(30, "You");
// Mapping string values to int keys
abstract_hash2.put(10, "Geeks");
abstract_hash2.put(15, "4");
abstract_hash2.put(20, "Geek");
abstract_hash2.put(25, "Welcomes");
abstract_hash2.put(30, "You");
// Displaying the IdentityHashMap
System.out.println("First Map: "
+ abstract_hash1);
// Displaying the final IdentityHashMap
System.out.println("Second Map: "
+ abstract_hash2);
// Displaying the equality
System.out.println("Equality: "
+ abstract_hash1.equals(abstract_hash2));
}
}
输出:
First Map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
Second Map: {10=Geeks, 30=You, 20=Geek, 25=Welcomes, 15=4}
Equality: false