Java之extends關鍵字

extends關鍵字

1.Java中使用extends關鍵字實現類的集成機制

2.通過繼承子類自動擁有了基類（superclass）的所有成員（成員變量和成員方法）

3.Java只支持單繼承

4.一個子類只能有一個基類，一個基類可以派生出多個子類

calss Person {
	private String name;
	private int age;
	public void setName(String name) {
		this.name = name;
	}
	public void setAge(int age) {
	this.age = age;
	}
	
	public String getName() {
		return name;
	}
	public int getAge() {
		return age;
	}
}

calss Student extends Person {
	private String school;
	public String getSchool() {
		return school;
	}
	
	public void setSchool(String school) {
		this.school = school;
	}
}

public class TestPerson {
	public static void main(String[] args) {
		Student student = new Student();
		student.setName("john");
		student.setAge(18);
	}
}