import(life): Add java practice 5.

5 files changed, 370 insertions, 0 deletions

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

+		}

+	}

+}