一、super调用超类构造函数
super（parameter-list）；
parameter-list指定超类中构造函数所需的任何形参，super（）必须是在子类构造函数中执行的第一个语句。超类定义的任何形式的构造函数都可以被super（）调用，被执行的构造函数就是与实参相匹配的那一个。
当存在多重继承时，super总是引用最靠近的超类的构造函数。例如：C类继承B类，B类继承A类，则C类的构造函数中使用super，引用B类的构造函数。
如果不使用super（），那么就会执行每个超类的默认（无形参）构造函数。
例如：
<span style="font-size:14px;">public class test { public static void main(String [] args){ new Teacher("one", 62); new Teacher("two", 180); new Teacher("three", 65, 188); } } class Human { static private float weight; static private int height; Human(float weight){ Human.weight = weight; System.out.println(Human.weight); } Human(int height){ Human.height = height; System.out.println(Human.height); } Human(float weight, int height){ Human.weight = weight; Human.height = height; System.out.println(Human.weight + " " + Human.height); } } class Teacher extends Human { static private String s; Teacher(String s, float weight){ super(weight); Teacher.s = s; System.out.println(Teacher.s); } Teacher(String s, int height){ super(height); Teacher.s = s; System.out.println(Teacher.s); } Teacher(String s, float weight, int height){ super(weight, height); Teacher.s = s; System.out.println(Teacher.s); } } </span> |
结果：
62
one
180
two
65.0 188
three
