Assignment 7:
Goal: Learning Inheritance, super keyword and Method Overriding
Grandma:
- Create a class called ‘Grandma’.
- Declare Field as below in it.
- String name = “Stella”;
- Have below methods in it.
- public void work()
- Have print statements as you wish in the above methods’ definition.
Mother:
- Create a class called ‘Mother’ as Child class of Grandma.
- Declare Field as below in it.
- String name = “Arasi”;
- Have below method in it.
- public void work()
- Have print statement to print ‘name’ and super.name in work() definition.
- Add ‘super.work();’ inside work() method.
Kid:
- Create a class called ‘Kid’ as Sub class of Mother.
- Declare Field as below in it.
- String name = “Suman”;
- Define main method as ‘public static void main(String[] args)
- Inside main method, create an instance called ‘kid’ for Kid class.
- Have below methods in it.
- public void work()
- public void study()
- Have print statements as you wish in the above two methods’ definition.
- Call study() method from main method.
- Inside study() method, call work() method.
- Print name and super.name inside work() method.
package B15;public class Grandma {String name = "stella";int age=80;public void work() {System.out.println("grandma has work");}}package B15; public class Grandma { String name = "stella"; int age=80; public void work() { System.out.println("grandma has work"); } }package B15; public class Grandma { String name = "stella"; int age=80; public void work() { System.out.println("grandma has work"); } }
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package B15;public class Mother extends Grandma {String name = "arasi";int age = 50;public void work() {System.out.println("Mother has work");System.out.println("Mother name = " + name);System.out.println("Grandma name = " + super.name);System.out.println("Grandma age = " +super.age);super.work();}}package B15; public class Mother extends Grandma { String name = "arasi"; int age = 50; public void work() { System.out.println("Mother has work"); System.out.println("Mother name = " + name); System.out.println("Grandma name = " + super.name); System.out.println("Grandma age = " +super.age); super.work(); } }package B15; public class Mother extends Grandma { String name = "arasi"; int age = 50; public void work() { System.out.println("Mother has work"); System.out.println("Mother name = " + name); System.out.println("Grandma name = " + super.name); System.out.println("Grandma age = " +super.age); super.work(); } }
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package B15;public class Kid extends Mother {String name= "pavi";int age = 30;public static void main(String[] args) {Kid kid = new Kid();kid.work();kid.study();}public void work() {System.out.println("work of kid");}public void study() {super.work();System.out.println("Mother age = "+super.age);System.out.println("kid name = "+ name);System.out.println("kid age = "+ age);System.out.println("study of kid");}}package B15; public class Kid extends Mother { String name= "pavi"; int age = 30; public static void main(String[] args) { Kid kid = new Kid(); kid.work(); kid.study(); } public void work() { System.out.println("work of kid"); } public void study() { super.work(); System.out.println("Mother age = "+super.age); System.out.println("kid name = "+ name); System.out.println("kid age = "+ age); System.out.println("study of kid"); } }package B15; public class Kid extends Mother { String name= "pavi"; int age = 30; public static void main(String[] args) { Kid kid = new Kid(); kid.work(); kid.study(); } public void work() { System.out.println("work of kid"); } public void study() { super.work(); System.out.println("Mother age = "+super.age); System.out.println("kid name = "+ name); System.out.println("kid age = "+ age); System.out.println("study of kid"); } }
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Output:
work of kid
Mother has work
name = arasi
Grandma name = stella
Grandma age = 80
grandma has work
Mother age = 50
kid name = pavi
kid age = 30
study of kid
Example for constructor invoke parent class constructor using keyword super
package B15;public class Supermarket {public String productName;public int price;public int discount;public String name, place;Supermarket(String productName, int price, int discount) {this.productName = productName;this.price = price;this.discount = discount;}Supermarket(String name, String place) {this("biscuits", 30, 5);this.name = name;this.place = place;}public static void main(String[] args) {Supermarket product1 = new Supermarket("cinthol", 22, 2);Supermarket product2 = new Supermarket("deen supermarket", "velachery");product1.sell();product2.sell2();}private void sell2() {System.out.println(productName);System.out.println(price);System.out.println(discount);System.out.println(name + "\n" + place);}public void sell() {System.out.println(productName);System.out.println(price);System.out.println(discount);}}package B15; public class Supermarket { public String productName; public int price; public int discount; public String name, place; Supermarket(String productName, int price, int discount) { this.productName = productName; this.price = price; this.discount = discount; } Supermarket(String name, String place) { this("biscuits", 30, 5); this.name = name; this.place = place; } public static void main(String[] args) { Supermarket product1 = new Supermarket("cinthol", 22, 2); Supermarket product2 = new Supermarket("deen supermarket", "velachery"); product1.sell(); product2.sell2(); } private void sell2() { System.out.println(productName); System.out.println(price); System.out.println(discount); System.out.println(name + "\n" + place); } public void sell() { System.out.println(productName); System.out.println(price); System.out.println(discount); } }package B15; public class Supermarket { public String productName; public int price; public int discount; public String name, place; Supermarket(String productName, int price, int discount) { this.productName = productName; this.price = price; this.discount = discount; } Supermarket(String name, String place) { this("biscuits", 30, 5); this.name = name; this.place = place; } public static void main(String[] args) { Supermarket product1 = new Supermarket("cinthol", 22, 2); Supermarket product2 = new Supermarket("deen supermarket", "velachery"); product1.sell(); product2.sell2(); } private void sell2() { System.out.println(productName); System.out.println(price); System.out.println(discount); System.out.println(name + "\n" + place); } public void sell() { System.out.println(productName); System.out.println(price); System.out.println(discount); } }
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Output:
cinthol
22
2
biscuits
30
5
deen supermarket
velachery
package B15;public class Super extends Supermarket {Super(String productName, int price, int discount) {super(productName, price, discount);}public static void main(String[] args) {Super su = new Super("c1", 40, 2);su.display();}public void display() {System.out.println("productName = "+productName+"\n"+"price"+price+"\n"+"discount"+discount);}}package B15; public class Super extends Supermarket { Super(String productName, int price, int discount) { super(productName, price, discount); } public static void main(String[] args) { Super su = new Super("c1", 40, 2); su.display(); } public void display() { System.out.println("productName = "+productName+"\n"+"price"+price+"\n"+"discount"+discount); } }package B15; public class Super extends Supermarket { Super(String productName, int price, int discount) { super(productName, price, discount); } public static void main(String[] args) { Super su = new Super("c1", 40, 2); su.display(); } public void display() { System.out.println("productName = "+productName+"\n"+"price"+price+"\n"+"discount"+discount); } }
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output:
productName = c1
price40
discount2
原文链接:Task-7
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