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                            ```
1. 所有集合都在java.util包下
2. Collection和Map是Java集合框架的根接口
3. 6個接口，表示不同集合類型，是集合框架的基礎
4. 5個抽象類，對集合接口的部分實現，可擴展的自定義集合類
5. 8個實現類，對接口的具體實現
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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