阅读java解惑之后的代码_以下代码结果是 class dog { public static void bark() { sy-优快云博客

本文链接：https://blog.youkuaiyun.com/hehuihehui/article/details/2721710

本文通过几个具体的Java程序示例，展示了静态嵌套类的使用、方法覆盖的效果、多态性的体现以及自定义类的实现，包括如何正确实现equals和hashCode方法以支持自定义类在集合中的正确操作。

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public class ShadesOfGray {
    public static void main(String[] args){
        System.out.println(X.Y.Z);
    }
}

class X {
    static class Y {
        static String Z = "Black";
    } 
    static C Y = new C();
}

class C {
    String Z = "White";
}

class Base {
    public String className = "Base";
}

class Derived extends Base {
   private String className = "Derived";
}

public class PrivateMatter {
    public static void main(String[ ] args) {
        System.out.println(new Derived().className);
    }
}

class Dog {
    public  void bark() {
        System.out.print("woof ");
    }
}

class Basenji extends Dog {
    public  void bark() { }
}
public class Bark {
    public static void main(String args[]) {
        Dog woofer = new Dog();
        Dog nipper = new Basenji();
        woofer.bark();
        nipper.bark();
    }
}
   import java.util.*;
public class Name {
    private String first, last;
    public Name(String first, String last) {
        this.first = first;
        this.last = last;
    }
    public boolean equals(Object o) {
        if (!(o instanceof Name))
            return false;
        Name n = (Name)o;
        return n.first.equals(first) && n.last.equals(last);
        
    }
    
    public int hashCode() {
     
        return 37 * first.hashCode() + last.hashCode();
   
        
        
    
    }

    public static void main(String[] args) {
        Set s = new HashSet();
        s.add(new Name("Mickey", "Mouse"));
        System.out.println(
            s.contains(new Name("Mickey", "123")));
        
        
    } 
}