UML 类图的关系

1. 关联关系

1.1 单向关联

、

public class ClassA {

    private ClassB  bVar;

}

public class ClassB {

  //...

}

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1.2 双向关联

public class ClassA {

    private ClassB  bVar;

}

public class ClassB {

    private ClassA aVar;
    // ...

}

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1.3 自关联

public class ClassH {
    
    private ClassH  hVar;

}

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2. 聚合、组合

2.1 聚合

public class Computer {
    private  CPU  cpu;
     //....
     
}

class CPU  {
    //...
    
}

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2.2 组合

public class Database {
    
    private ArrayList<Table>  tableList;

}


class Table {
    
    
}

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3. 依赖

public class ClassX {
    
    public void funx(ClassY  yObj){};

}

class ClassY {
    
}

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4. 泛化（继承）

5. 实现