1, inherited Notes
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Subclass can only inherit all non-private members of the parent class (member methods and member variables)
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Subclass can not inherit the parent class constructor, but by the super keyword to access the parent class constructor.
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In order to do away inherit some functions
2, when to use inheritance
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Inheritance is the embodiment of a relationship: "is a".
Person
Student
Teacher
fruit
apple
banana
orange
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Using the dummy method.
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If there are two classes A, B. Only they meet is a B of A or B is an A, you can consider using inheritance.
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class Demo3_Extends {
public static void main(String[] args) {
Son s = new Son();
s.show();
}
}
class Father {
private String name;
private void show() {
System.out.println("Hello World!");
}
}
class Son extends Father {
}