Java IdentityHashMap values() 方法

2025年1月7日 | 阅读 2 分钟

Java IdentityHashMap 类的 values() 方法用于获取调用 IdentityHashMap 中所有值的集合视图。

语法

包含 Map 中所有值的集合

示例 1

import java.util.IdentityHashMap;

public class IdentityHashMapValuesExample1 {
    public static void main(String[] args) {
   //Creating an object of IdentityHashMap class
   IdentityHashMap<Integer,String> map1 = new IdentityHashMap<Integer,String>(6);
      
   //Putting key-value pairs inside map1
   map1.put(1, "Java");
   map1.put(2, "is");
   map1.put(3, "the");
   map1.put(4, "best");
   map1.put(5, "programming");
   map1.put(6, "language");
   
   //Displaying size of map1
   System.out.println(map1.size());
   
   //Displaying elements of map1
   System.out.println(map1);
   
   //Displaying a collection of all the values
   System.out.println(map1.values());
}
}

输出

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

示例 2

import java.util.IdentityHashMap;

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 IdentityHashMapValuesExample2 {
    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> map1 = new IdentityHashMap<Integer,Student>(5);
                
        //Inserting the Student class objects into IdentityHashMap
        map1.put(1,stud1);
        map1.put(2,stud2);
        map1.put(3,stud3);
        map1.put(4,stud4);
        
        //Displaying the size of the map1
        System.out.println(map1.size());
        
        //Displaying elements of map1
        System.out.println(map1);
        
        //Displaying a collection of all the values
        System.out.println(map1.values());
}
}

输出

4
{[email protected], [email protected], [email protected], [email protected]}
[[email protected], [email protected], [email protected], [email protected]]

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Java IdentityHashMap values() 方法

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Java IdentityHashMap values() 方法

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示例 1

示例 2

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