public class Parent {
    public String name = "小頭爸爸";
    public boolean hasMoney = false;
 
    public void sleeping(){
        System.out.println("爸爸已經(jīng)睡了");
    }
 
    public void working(){
        System.out.println("爸爸正在工作。。。");
    }
}
 
public class Child extends Parent {
 
    public String name = "大頭兒子";
 
    /**
     * 當(dāng)子類和父類有屬性重名時(shí)，需要super才能調(diào)用到父類的屬性，
     * 直接調(diào)用會(huì)調(diào)用到子類的屬性
     * 如果不重名，可直接調(diào)用且調(diào)用的是父類的屬性
     */
    private void testParam(){
        System.out.println("爸爸的名字叫" + super.name);
        System.out.println("孩子的名字是" + name);
        System.out.println("爸爸是否有有錢：" + hasMoney);
    }
 
    /**
     * 方法和上面的屬性結(jié)果一樣
     */
    public void testMethod(){
        sleeping();
        super.sleeping();
        super.working();
    }
 
    public void sleeping(){
        System.out.println("兒子已經(jīng)睡了");
    }
 
    public static void main(String[] args) {
        Child child = new Child();
        child.testParam();
        child.testMethod();
    }
}

public class Parent {
    ...
    public Parent() {
    }
    ...
}
 
public class Child extends Parent {
    ...
    public Child() {
    }
    ...
}

public class Parent {
    public String name = "小頭爸爸";
    public Parent(int age) {
    }
 
    public void sleeping(){
        System.out.println("爸爸已經(jīng)睡了");
    }
}
 
public class Child extends Parent {
    public String name = "大頭兒子";
    public Child() {//如果沒有super來初始化父類，同樣也會(huì)報(bào)錯(cuò)
//        super();//編譯期報(bào)錯(cuò),因?yàn)楦割惒]有無參構(gòu)造函數(shù)
        super(15);//正確打開方式
    }
 
    private void printParentName(){
        System.out.println("爸爸的名字叫" + super.name);
    }
 
    private void parentStatus(){
        super.sleeping();
    }
}

class Person {
? ? int id;
? ? String name;

? ? Person(int id, String name) {
? ? ? ? this.id = id;
? ? ? ? this.name = name;
? ? }
}

class Emp extends Person {
? ? float salary;

? ? Emp(int id, String name, float salary) {
? ? ? ? super(id, name);// reusing parent constructor
? ? ? ? this.salary = salary;
? ? }

? ? void display() {
? ? ? ? System.out.println(id + " " + name + " " + salary);
? ? }
}

class TestSuper5 {
? ? public static void main(String[] args) {
? ? ? ? Emp e1 = new Emp(1, "ankit", 45000f);
? ? ? ? e1.display();
? ? }
}