子类继承父类的构造函数注意事项

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如果父类有无参构造方法，那么在写子类的构造方法时可以不用super调用，其实就是调用父类的无参构造方法，总的来说就是子类的构造方法创建时要调用父类的构造方法。

package cn.java.test;

public class Person {
	public String name;
	public int age;

	public Person(String name, int age) {
		this.name = name;
		this.age = age;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	} 
	
	
}

package cn.java.test;

public class Student extends Person{
	private String school;
	
	public Student(String name, int age,String school) {
		super(name, age);//子类写个有参的构造方法去调用父类有参的构造方法
		this.school = school;
	}

	@Override
	public String toString() {
		//调用父类toString()方法
		return super.toString() + " school=" + school + "";
	}
	
	

}

package cn.java.test;

public class Main {
	public static void main(String[] args) {
		Person p = new Person("张三", 23);
		Student s = new Student("李四", 12, "HHUC");
		System.out.println(p);
		System.out.println(s);
	}
}