Java super关键字的用法详解

class Person{
    public String name; //成员变量
    public Person(String name) {
        this.name = name;
    }
}
class Student extends Person{
    String name = "student";
    public Student(String name) {
        super(name);
    }
    public void help() {
        //调用父类的成员属性
        System.out.println(name); //student 直接使用，优先使用局部变量
        System.out.println(super.name); // B 直接使用父类的成员变量
    }
}
public class s {
    public static void main(String[] args) {
        Student p = new Student("B");
        p.help();
    }
}

class {
    public String name;
    public Person(String name) {
        this.name = name; //Test
    }
    public void help() {
        System.out.println(this.name+"Person");
    }
}
class Student extends Person{
    String name = "student";
    public Student(String name) {
        super(name); //Test
    }
    public void help() {
        //调用父类的成员方法
        super.help();
        System.out.println(this.name+"Student"); //Student this调用的式同类中的变量
    }
}
public class s {
    public static void main(String[] args) {
        Student p = new Student("Test");
        p.help();
    }
}
//Test Person
//student Student

public class Father{
    int id;
    public Father(){
        System.out.println("父类构造方法");
    }
}
public class Son extends Father{
    public Son(){
    	//super(); //系统会默认生成，可有可无
        System.out.println("子类构造方法");
    }
}
public class Test{
    public static void main(String[] args){
        Son s = new Son();
    }
}

public class Father{
    int id;
    public Father(int id){
        System.out.println("父类构造方法");
    }
}
public class Son extends Father{
    public Son(int id){
    	super(id); //手动调用父类的有参构造方法
        System.out.println("子类构造方法");
    }
}
public class Test{
    public static void main(String[] args){
        Son s = new Son(1);
    }
}