Helpful examples of encapsulation and inheritance in Java
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- 2021-01-02 10:51:582159browse
Java basic tutorialThe column introduces helpful cases of encapsulation and inheritance in Java
Recommended (free): java basic tutorial
1. Code and renderings
1. Encapsulation
Case: Requirements Description
Use encapsulation to implement the penguin class of the electronic pet system to correctly input the health value and intimacy
Ensure the validity of the health value (0 -100), otherwise take the default value of 60
to ensure the effectiveness of intimacy (0-100), otherwise take the default value of 60
The code is as follows (example):
package work1;
public class Dog {
private String name;
private String sex;
private int love;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(int sex) {
if(sex==1){
this.sex = "Q仔";
}else{
this.sex = "Q妹";
}
}
public int getLove() {
return love;
}
public void setLove(int love) {
if(love>=0&&love<pre class="brush:php;toolbar:false">package work1;
public class Penguin {
private String name;
private String sex;
private int health;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(int sex) {
if(sex==1){
this.sex = "Q仔";
}else{
this.sex = "Q妹";
}
}
public int getHealth() {
return health;
}
public void setHealth(int health) {
if(health>=0&&health<pre class="brush:php;toolbar:false">package work1;
import java.util.Scanner;
public class Test1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("欢迎您来到宠物店! \n 请输入要领养宠物的名字：");
String name = sc.next();
System.out.println("请选择要领养的宠物类型：（1.狗狗 2.企鹅）");
int i = sc.nextInt();
if(i==1){//狗狗
Dog dog = new Dog();
dog.setName(name);
System.out.println("请选择狗狗的性别：(1.Q仔 2.Q妹)");
dog.setSex(sc.nextInt());
System.out.println("请输入狗狗的亲密度（1~100之间）：");
dog.setLove(sc.nextInt());
System.out.println("宠物的自白：\n 我的名字叫"+name+",健康值是"+0+",和主人的" +
"亲密度是"+dog.getLove()+",我的性别是"+dog.getSex());
}else {//企鹅
Penguin p = new Penguin();
p.setName(name);
System.out.println("请选择企鹅的性别：(1.Q仔 2.Q妹)");
p.setSex(sc.nextInt());
System.out.println("请输入企鹅的健康值（1~100之间）：");
p.setHealth(sc.nextInt());
System.out.println("宠物的自白：\n 我的名字叫"+name+",健康值是"+p.getHealth()+",和主人的" +
"亲密度是"+0+",我的性别是"+p.getSex());
}
}
}
2. Inheritance
Case: Use inheritance to optimize the electronic pet system, extract the parent class, create a subclass, and use super in the subclass to call the parent class constructor.
The code is as follows (example):
package work3;
public class Dog extends Pet {
@Override
public void show() {
System.out.println("宠物的自白：\n 我的名字叫"+this.getName()+",健康值是"+0+",和主人的" +
"亲密度是"+this.getLove()+",我的性别是"+this.getSex());
}
private int love;
public Dog(String name, int sex, int love) {
super(name, sex);
this.love = love;
}
public int getLove() {
return love;
}
public void setLove(int love) {
if(love>=0&&love<pre class="brush:php;toolbar:false">package work3;
public class Penguin extends Pet {
@Override
public void show() {
System.out.println("宠物的自白：\n 我的名字叫"+this.getName()+",健康值是"+this.getHealth()+",和主人的" +
"亲密度是"+0+",我的性别是"+this.getSex());
}
private int health;
public Penguin(String name, int sex, int health) {
super(name, sex);
this.health = health;
}
public int getHealth() {
return health;
}
public void setHealth(int health) {
if(health>=0&&health<pre class="brush:php;toolbar:false">package work3;
public class Pet {
private String name;
private String sex;
public void show(){
}
public Pet(String name, int sex) {
this.name = name;
if(sex==1){
this.sex = "Q仔";
}else{
this.sex = "Q妹";
}
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(int sex) {
if(sex==1){
this.sex = "Q仔";
}else{
this.sex = "Q妹";
}
}
}package work3;
import java.util.Scanner;
import static java.lang.System.out;
public class Test2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
out.println("欢迎您来到宠物店! \n 请输入要领养宠物的名字：");
String name = sc.next();
out.println("请选择要领养的宠物类型：（1.狗狗 2.企鹅）");
int i = sc.nextInt();
if (i==1){//狗狗
out.println("请选择狗狗的性别：(1.Q仔 2.Q妹)");
int sex=sc.nextInt();
out.println("请输入狗狗的亲密度（1~100之间）：");
Dog dog = new Dog(name, sex, sc.nextInt());
dog.show();
}else {//企鹅
out.println("请选择企鹅的性别：(1.Q仔 2.Q妹)");
int sex=sc.nextInt();
out.println("请输入企鹅的健康值（1~100之间）：");
Penguin p = new Penguin(name, sex, sc.nextInt());
p.show();
}
}
}
##Summary
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