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java初学者必看!Java中封装和继承的案例,对你学java很有帮助!

2020-12-17 16:09 351 查看 https://www.cnblogs.com/lwh101

一、代码及效果图

1.封装

案例:需求说明
使用封装实现电子宠物系统的企鹅类正确输入健康值和亲密度
保证健康值的有效性(0-100),否则取默认值60
保证亲密度的有效性(0-100),否则取默认值60
代码如下(示例):

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<=100){
this.love = love;
}else {
System.out.println("亲密度应该在0-100之间,默认值是60");
this.love = 60;
}
}
}
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<=100){
this.health = health;
}else {
System.out.println("健康值应该在0-100之间,默认值是60");
this.health = 60;
}
}
}
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.继承

案例:使用继承优化电子宠物系统,抽取父类,创建子类,在子类中使用super调用父类构造方法。
代码如下(示例):

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;
}

pu
ad8
blic void setLove(int love) {
if(love>=0&&love<=100){
this.love = love;
}else {
System.out.println("亲密度应该在0-100之间,默认值是60");
this.love = 60;
}
}
}
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<=100){
this.health = health;
}else {
System.out.println("健康值应该在0-100之间,默认值是60");
this.health = 60;
}
}
}
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();
}
}
}

总结

以上就是封装和继承案例的内容,主要利用了封装和继承的方法。
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