Java IdentityHashMap entrySet() 方法

2025年1月7日 | 阅读 2 分钟

Java IdentityHashMap 类的 entrySet() 方法用于获取调用 IdentityHashMap 中所有键值对的集合视图。

语法

调用 IdentityHashMap 中所有键值对的集合视图。

示例 1

import java.util.IdentityHashMap;
import java.util.Set;

public class IdentityHashMapEntrySetExample1 {
    public static void main(String[] args) {
   //Creating an object of IdentityHashMap class
   IdentityHashMap<String,Integer> map = new IdentityHashMap<String,Integer>(6);
   
   //Putting key-value pairs inside map
   map.put("Java", 1);
   map.put("is", 2);
   map.put("the", 3);
   map.put("best", 4);
   map.put("programming", 5);
   map.put("language", 6);
   
   //Creating a Set
   Set set = map.entrySet();
   
   //Displaying all entries in Set
   System.out.println(set);
}
}

输出

[Java=1, the=3, language=6, programming=5, best=4, is=2]

示例 2

import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

class Student{
    private int roll;
    private String name;
    private int standard;
    
    public Student(int roll,String name,int standard){
        this.roll = roll;
        this.name = name;
        this.standard = standard;
    }
    
    public String disp(){
        return roll+" "+name+" "+standard;
    }
}

public class IdentityHashMapEntrySetExample2 {
    public static void main(String[] args) {
        
        //Creating Objects of Student class
        Student stud1 = new Student(1 ,"Ram ",10);
        Student stud2 = new Student(2 ,"Shyam ",10);
        Student stud3 = new Student(3 ,"Aman ",12);
        Student stud4 = new Student(4 ,"Harsh ",12);
        Student stud5 = new Student(5 ,"Shivam",11);
        
        //Creating an instance of IdentityHashMap
        IdentityHashMap<Integer,Student> map = new IdentityHashMap<Integer,Student>(5);
   
        //Inserting the Student class objects into IdentityHashMap
        map.put(1,stud1);
        map.put(2,stud2);
        map.put(3,stud3);
        map.put(4,stud4);        
        //Creating a Set
        Set set = map.entrySet();
   
        //Displaying all entries in Set
        System.out.println(set);
        
        for(IdentityHashMap.Entry<Integer,Student> entry : map.entrySet()){
            System.out.println(entry.getKey() + " : " +entry.getValue());
        }
}
}

输出

 [[email protected], [email protected], [email protected], [email protected]]
1 : [email protected]
3 : [email protected]
2 : [email protected]
4 : [email protected]

下一个主题Java-identityhashmap-containsvalue-method

Java IdentityHashMap entrySet() 方法

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Java IdentityHashMap entrySet() 方法

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示例 1

示例 2

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