Java IdentityHashMap remove() 方法

2025年1月7日 | 阅读 2 分钟

Java IdentityHashMap 类的 remove(Object key) 方法用于在指定键存在于调用 IdentityHashMap 时，移除与该键的关联。

语法

参数

key - 要移除关联的键。

与指定键关联的前一个值，如果不存在关联，则为 null。

示例 1

import java.util.IdentityHashMap;

public class IdentityHashMapRemoveExample1 {
     public static void main(String[] args) {
   //Creating an object of IdentityHashMap class
   IdentityHashMap<String,Integer> map1 = new IdentityHashMap<String,Integer>(6);
      
   //Putting key-value pairs inside map1
   map1.put("Java", 1);
   map1.put("is", 2);
   map1.put("the", 3);
   map1.put("best", 4);
   map1.put("programming", 5);
   map1.put("language", 6);
   
   //Displaying elements of map1
   System.out.println(map1);
   
   //Removing some linkage from the map
   System.out.println(map1.remove("the"));
   System.out.println(map1.remove("best"));
   
   //Displaying elements of map1 after removing some elements
   System.out.println(map1);
         
}
}

输出

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

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 IdentityHashMapRemoveExample2 {
    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 elements of map1
        System.out.println(map1);
        
        //Removing elements from map1
        System.out.println(map1.remove(2));
        System.out.println(map1.remove(3));
        
        //Displaying elements of map1 after removing some elements
        System.out.println(map1);
}
}

输出

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

下一个主题Java-identityhashmap-putall-method

Java IdentityHashMap remove() 方法

语法

参数

返回

示例 1

示例 2

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Java IdentityHashMap remove() 方法

语法

参数

返回

示例 1

示例 2

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