Java 中的 IdentityHashMap 等于()方法
原文:https://www . geesforgeks . org/identityhashmap-equals-method-in-Java/
java 中的 Java . util . identity hashmap . 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这个映射的元素。
语法:
ihashmap1.equals(*ihashmap2*)
参数:该方法接受一个身份哈希映射类型的参数 ihashmap2 ,并引用要用该哈希映射检查其相等性的映射。
返回值:如果两个对象映射相等,则方法返回真,否则返回假。
下面的程序说明了 Java . util . identity hashmap . equals()方法的工作: 程序 1:
// Java code to illustrate the equals() method
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<Integer, String> identity_hash1 =
new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> identity_hash2 =
new IdentityHashMap<Integer, String>();
// Mapping string values to int keys
identity_hash1.put(10, "Geeks");
identity_hash1.put(15, "4");
identity_hash1.put(20, "Geeks");
identity_hash1.put(25, "Welcomes");
identity_hash1.put(30, "You");
// Mapping string values to int keys
identity_hash2.put(10, "Geeks");
identity_hash2.put(15, "4");
identity_hash2.put(20, "Geeks");
identity_hash2.put(25, "Welcomes");
identity_hash2.put(30, "You");
// Displaying the IdentityHashMap
System.out.println("First Map: "
+ identity_hash1);
// Displaying the final IdentityHashMap
System.out.println("Second Map: "
+ identity_hash2);
// Displaying the equality
System.out.println("Equality: "+
identity_hash1.equals(identity_hash2));
}
}
Output:
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
程序 2:
// Java code to illustrate the equals() method
import java.util.*;
public class Identity_Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty IdentityHashMap
IdentityHashMap<Integer, String> identity_hash1 =
new IdentityHashMap<Integer, String>();
IdentityHashMap<Integer, String> identity_hash2 =
new IdentityHashMap<Integer, String>();
// Mapping string values to int keys
identity_hash1.put(10, "Geeks");
identity_hash1.put(15, "4");
identity_hash1.put(20, "Geeks");
identity_hash1.put(25, "Welcomes");
identity_hash1.put(30, "You");
// Mapping string values to int keys
identity_hash2.put(10, "Geeks");
identity_hash2.put(15, "4");
identity_hash2.put(20, "Geek");
identity_hash2.put(25, "Welcomes");
identity_hash2.put(30, "You");
// Displaying the IdentityHashMap
System.out.println("First Map: "
+ identity_hash1);
// Displaying the final IdentityHashMap
System.out.println("Second Map: "
+ identity_hash2);
// Displaying the equality
System.out.println("Equality: "+
identity_hash1.equals(identity_hash2));
}
}
Output:
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
版权属于:月萌API www.moonapi.com,转载请注明出处