From 6c0e4b64fa9967b2a2ef7dfb840cab3a8325f67e Mon Sep 17 00:00:00 2001 From: crupest Date: Tue, 27 Apr 2021 17:14:23 +0800 Subject: import(life): Add java practice 5. --- .../javatest/src/javatest/e0501/Main.java | 93 +++++++++++++++++++ .../javatest/src/javatest/e0502/Main.java | 101 +++++++++++++++++++++ .../javatest/src/javatest/p0501/HardWork.java | 60 ++++++++++++ .../javatest/src/javatest/p0502/Road.java | 70 ++++++++++++++ .../src/javatest/p0503/QuadrangleUseInterface.java | 46 ++++++++++ 5 files changed, 370 insertions(+) create mode 100644 works/life/java-practice/javatest/src/javatest/e0501/Main.java create mode 100644 works/life/java-practice/javatest/src/javatest/e0502/Main.java create mode 100644 works/life/java-practice/javatest/src/javatest/p0501/HardWork.java create mode 100644 works/life/java-practice/javatest/src/javatest/p0502/Road.java create mode 100644 works/life/java-practice/javatest/src/javatest/p0503/QuadrangleUseInterface.java (limited to 'works/life/java-practice/javatest') diff --git a/works/life/java-practice/javatest/src/javatest/e0501/Main.java b/works/life/java-practice/javatest/src/javatest/e0501/Main.java new file mode 100644 index 0000000..7639bc8 --- /dev/null +++ b/works/life/java-practice/javatest/src/javatest/e0501/Main.java @@ -0,0 +1,93 @@ +package javatest.e0501; + +import java.util.Scanner; + +interface Soundable { + void makeSound(); + + void turnUpVolumn(); + + void turnDownVolumn(); +} + +class Radio implements Soundable { + private int volumn = 5; + + @Override + public void makeSound() { + System.out.println("Radio sound..."); + } + + @Override + public void turnUpVolumn() { + volumn++; + } + + @Override + public void turnDownVolumn() { + volumn--; + } +} + +class Walkman implements Soundable { + private int volumn = 5; + + @Override + public void makeSound() { + System.out.println("Walkman sound..."); + } + + @Override + public void turnUpVolumn() { + volumn++; + } + + @Override + public void turnDownVolumn() { + volumn--; + } +} + +class Mobilephone implements Soundable { + private int volumn = 5; + + @Override + public void makeSound() { + System.out.println("Mobilephone sound..."); + } + + @Override + public void turnUpVolumn() { + volumn++; + } + + @Override + public void turnDownVolumn() { + volumn--; + } +} + +public class Main { + public static void main(String[] args) { + Scanner scanner = new Scanner(System.in); + String t = scanner.next(); + Soundable soundable = null; + + switch (t) { + case "radio": + soundable = new Radio(); + break; + case "walkman": + soundable = new Walkman(); + break; + case "mobilephone": + soundable = new Mobilephone(); + break; + default: + System.out.println("Unknown device."); + System.exit(1); + } + + soundable.makeSound(); + } +} diff --git a/works/life/java-practice/javatest/src/javatest/e0502/Main.java b/works/life/java-practice/javatest/src/javatest/e0502/Main.java new file mode 100644 index 0000000..405a278 --- /dev/null +++ b/works/life/java-practice/javatest/src/javatest/e0502/Main.java @@ -0,0 +1,101 @@ +package javatest.e0502; + +abstract class Animal { + public Animal(String name, String color, String type) { + super(); + this.name = name; + this.color = color; + this.type = type; + } + + private String name; + private String color; + private String type; + + abstract void eat(); + + abstract void makeSound(); + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public String getColor() { + return color; + } + + public void setColor(String color) { + this.color = color; + } + + public String getType() { + return type; + } + + public void setType(String type) { + this.type = type; + } +} + +class Rabbit extends Animal { + public Rabbit() { + super("兔子", "白色", "哺乳类"); + } + + @Override + public void eat() { + System.out.println("兔子吃..."); + } + + @Override + public void makeSound() { + System.out.println("兔子叫..."); + } +} + +interface Swimmable { + void swim(); +} + +class Frog extends Animal implements Swimmable { + public Frog() { + super("青蛙", "绿色", "非哺乳类"); + } + + @Override + public void eat() { + System.out.println("青蛙吃..."); + } + + @Override + public void makeSound() { + System.out.println("青蛙叫..."); + } + + @Override + public void swim() { + System.out.println("青蛙游泳..."); + } +} + +public class Main { + public static void main(String[] args) { + Rabbit rabbit = new Rabbit(); + Frog frog = new Frog(); + + Animal animal = rabbit; + animal.eat(); + animal.makeSound(); + + animal = frog; + animal.eat(); + animal.makeSound(); + + Swimmable swimmable = frog; + swimmable.swim(); + } +} diff --git a/works/life/java-practice/javatest/src/javatest/p0501/HardWork.java b/works/life/java-practice/javatest/src/javatest/p0501/HardWork.java new file mode 100644 index 0000000..b4121af --- /dev/null +++ b/works/life/java-practice/javatest/src/javatest/p0501/HardWork.java @@ -0,0 +1,60 @@ +package javatest.p0501; + +abstract class Employee { + public abstract double earnings(); +} + +class YearWorker extends Employee { + public double earnings() { + return 50000.456; + } + // 重写earnings()方法 +} + +class MonthWorker extends Employee { + public double earnings() { + return 12 * 2300; + } + // 重写earnings()方法。 +} + +class WeekWorker extends Employee { + public double earnings() { + return 52 * 500; + } + // 重写earnings()方法。 +} + +class Company { + Employee[] employee; + double salaries = 0; + + Company(Employee[] employee) { + this.employee = employee; + } + + public double salariesPay() { + salaries = 0; + for (int i = 0; i < employee.length; i++) { + salaries = salaries + employee[i].earnings(); + } + // 计算salaries。 + return salaries; + } +} + +public class HardWork { + public static void main(String args[]) { + Employee[] employee = new Employee[20]; + for (int i = 0; i < employee.length; i++) { + if (i % 3 == 0) + employee[i] = new WeekWorker(); + else if (i % 3 == 1) + employee[i] = new MonthWorker(); + else if (i % 3 == 2) + employee[i] = new YearWorker(); + } + Company company = new Company(employee); + System.out.println("公司年工资总额:" + company.salariesPay()); + } +} diff --git a/works/life/java-practice/javatest/src/javatest/p0502/Road.java b/works/life/java-practice/javatest/src/javatest/p0502/Road.java new file mode 100644 index 0000000..7731494 --- /dev/null +++ b/works/life/java-practice/javatest/src/javatest/p0502/Road.java @@ -0,0 +1,70 @@ +package javatest.p0502; + +interface ComputerWeight { + public double computeWeight(); +} + +class Television implements ComputerWeight { + public double computeWeight() { + return 45.5; + } + // 实现computeWeight()方法。 +} + +class Computer implements ComputerWeight { + public double computeWeight() { + return 65.5; + } + // 实现computeWeight()方法。 +} + +class WashMachine implements ComputerWeight { + public double computeWeight() { + return 145; + } + // 实现computeWeight()方法。 +} + +class Car { + ComputerWeight[] goods; + double totalWeights = 0; + + Car(ComputerWeight[] goods) { + this.goods = goods; + } + + public double getTotalWeights() { + totalWeights = 0; + for (int k = 0; k < goods.length; k++) { + totalWeights = totalWeights + goods[k].computeWeight(); + } + // 计算totalWeights + return totalWeights; + } +} + +public class Road { + public static void main(String args[]) { + ComputerWeight[] goodsOne = new ComputerWeight[50], goodsTwo = new ComputerWeight[22]; + for (int i = 0; i < goodsOne.length; i++) { + if (i % 3 == 0) + goodsOne[i] = new Television(); + else if (i % 3 == 1) + goodsOne[i] = new Computer(); + else if (i % 3 == 2) + goodsOne[i] = new WashMachine(); + } + for (int i = 0; i < goodsTwo.length; i++) { + if (i % 3 == 0) + goodsTwo[i] = new Television(); + else if (i % 3 == 1) + goodsTwo[i] = new Computer(); + else if (i % 3 == 2) + goodsTwo[i] = new WashMachine(); + } + Car 大货车 = new Car(goodsOne); + System.out.println("大货车装载的货物重量:" + 大货车.getTotalWeights()); + Car 小货车 = new Car(goodsTwo); + System.out.println("小货车装载的货物重量:" + 小货车.getTotalWeights()); + } +} diff --git a/works/life/java-practice/javatest/src/javatest/p0503/QuadrangleUseInterface.java b/works/life/java-practice/javatest/src/javatest/p0503/QuadrangleUseInterface.java new file mode 100644 index 0000000..6cead68 --- /dev/null +++ b/works/life/java-practice/javatest/src/javatest/p0503/QuadrangleUseInterface.java @@ -0,0 +1,46 @@ +package javatest.p0503; + +interface drawTest { // 定义接口 + public void draw(); // 定义方法 +} + +// 定义平行四边形类，该类继承了四边形类，并实现了drawTest接口 +class ParallelogramgleUseInterface extends QuadrangleUseInterface implements drawTest { + public void draw() { // 由于该类实现了接口，所以需要覆盖draw()方法 + System.out.println("平行四边形.draw()"); + } + + void doAnyThing() { // 覆盖父类方法 + // SomeSentence + } +} + +class SquareUseInterface extends QuadrangleUseInterface implements drawTest { + public void draw() { + System.out.println("正方形.draw()"); + } + + void doAnyThing() { + // SomeSentence + } +} + +class AnyThingUseInterface extends QuadrangleUseInterface { + void doAnyThing() { + + } +} + +public class QuadrangleUseInterface { // 定义四边形类 + public void doAnyTthing() { + // SomeSentence + } + + public static void main(String[] args) { + drawTest[] d = { // 接口也可以进行向上转型操作 + new SquareUseInterface(), new ParallelogramgleUseInterface() }; + for (int i = 0; i < d.length; i++) { + d[i].draw(); // 调用draw()方法 + } + } +} -- cgit v1.2.3